bump version to 10.0.0

changelog: clarify and stamp date for v10
feat: add one to one relationship for embedding
2022-08-18 23:35:41 -05:00 · 2022-08-18 23:07:24 -05:00 · 2022-08-18 22:36:47 -05:00 · 2022-08-18 20:15:57 -05:00 · 2022-08-18 15:08:14 -05:00 · 2022-08-17 22:50:06 -05:00
198 changed files with 22345 additions and 5093 deletions
@@ -1,5 +1,5 @@
 freebsd_instance:
-  image_family: freebsd-13-0
+  image_family: freebsd-13-1

 build_task:
  name: Build FreeBSD (Stack)
@@ -0,0 +1,63 @@
+#!/bin/bash
+
+# This script builds PostgREST in a remote ARM server
+
+[ -z "$1" ] && { echo "Missing 1st argument: PostgREST github commit SHA"; exit 1; }
+[ -z "$2" ] && { echo "Missing 2nd argument: Build environment directory name"; exit 1; }
+
+PGRST_GITHUB_COMMIT="$1"
+SCRIPT_DIR="$2"
+
+DOCKER_BUILD_DIR="$SCRIPT_DIR/docker-env"
+
+install_packages() {
+  sudo apt-get update -y
+  sudo apt-get upgrade -y
+  sudo apt-get install -y git build-essential curl libffi-dev libffi7 libgmp-dev libgmp10 libncurses-dev libncurses5 libtinfo5 llvm libnuma-dev zlib1g-dev libpq-dev jq gcc
+  sudo apt-get clean
+}
+
+install_ghcup() {
+  export BOOTSTRAP_HASKELL_NONINTERACTIVE=1
+  export BOOTSTRAP_HASKELL_MINIMAL=1
+  curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh
+  source ~/.ghcup/env
+}
+
+install_cabal() {
+  ghcup upgrade
+  ghcup install cabal 3.6.0.0
+  ghcup set cabal 3.6.0.0
+}
+
+install_ghc() {
+  ghcup install ghc 8.10.7
+  ghcup set ghc 8.10.7
+}
+
+install_packages
+
+# Add ghcup to the PATH for this session
+[ -f ~/.ghcup/env ] && source ~/.ghcup/env
+
+ghcup --version || install_ghcup
+cabal --version || install_cabal
+ghc --version || install_ghc
+
+cd ~/$SCRIPT_DIR
+
+# Clone the repository and build the project
+git clone https://github.com/PostgREST/postgrest.git
+cd postgrest
+git checkout $PGRST_GITHUB_COMMIT
+cabal v2-update && cabal v2-build
+
+# Copy the built binary to the Dockerfile directory
+PGRST_BIN=$(cabal exec which postgrest | tail -1)
+cp $PGRST_BIN ~/$DOCKER_BUILD_DIR
+
+# Move and compress the built binary
+mkdir -p ~/$SCRIPT_DIR/result
+mv $PGRST_BIN ~/$SCRIPT_DIR/result
+cd ~/$SCRIPT_DIR
+tar -cJf result.tar.xz result
@@ -0,0 +1,16 @@
+# PostgREST docker hub image
+
+FROM ubuntu:focal AS postgrest
+
+RUN apt-get update -y \
+    && apt install -y --no-install-recommends libpq-dev zlib1g-dev jq gcc libnuma-dev \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY postgrest /usr/bin/postgrest
+
+EXPOSE 3000
+
+USER 1000
+
+CMD postgrest
@@ -0,0 +1,50 @@
+#!/bin/bash
+
+# This script publishes the Docker ARM images to Docker Hub.
+
+[ -z "$1" ] && { echo "Missing 1st argument: PostgREST github commit SHA"; exit 1; }
+[ -z "$2" ] && { echo "Missing 2nd argument: Docker repo"; exit 1; }
+[ -z "$3" ] && { echo "Missing 3rd argument: Docker username"; exit 1; }
+[ -z "$4" ] && { echo "Missing 4th argument: Docker password"; exit 1; }
+[ -z "$5" ] && { echo "Missing 5th argument: Build environment directory name"; exit 1; }
+[ -z "$6" ] && { echo "Missing 6th argument: PostgREST version"; exit 1; }
+
+PGRST_GITHUB_COMMIT="$1"
+DOCKER_REPO="$2"
+DOCKER_USER="$3"
+DOCKER_PASS="$4"
+SCRIPT_DIR="$5"
+PGRST_VERSION="v$6"
+IS_PRERELEASE="$7"
+
+DOCKER_BUILD_DIR="$SCRIPT_DIR/docker-env"
+
+clean_env()
+{
+    sudo docker logout
+}
+
+# Login to Docker
+sudo docker logout
+{ echo $DOCKER_PASS | sudo docker login -u $DOCKER_USER --password-stdin; } || { echo "Couldn't login to docker"; exit 1; }
+
+trap clean_env sigint sigterm exit
+
+# Move to the docker build environment
+cd ~/$DOCKER_BUILD_DIR
+
+# Push final images to Docker hub
+# NOTE: This command publishes a separate ARM image because the builds cannot
+#       be added to the manifest if they are not in the registry beforehand.
+#       This image must be manually deleted from Docker Hub at the end of the process.
+sudo docker buildx build --build-arg PGRST_GITHUB_COMMIT=$PGRST_GITHUB_COMMIT \
+                         -t $DOCKER_REPO/postgrest:$PGRST_VERSION-arm \
+                         --push .
+
+# Add the arm images to the manifest
+# NOTE: This assumes that there already is a `postgrest:<version>` image
+#       for the amd64 architecture pushed to Docker Hub
+sudo docker buildx imagetools create --append -t $DOCKER_REPO/postgrest:$PGRST_VERSION $DOCKER_REPO/postgrest:$PGRST_VERSION-arm
+[ -z $IS_PRERELEASE ] && sudo docker buildx imagetools create --append -t $DOCKER_REPO/postgrest:latest $DOCKER_REPO/postgrest:$PGRST_VERSION-arm
+
+sudo docker logout
@@ -4,18 +4,20 @@ on:
  push:
    branches:
      - main
+      - rel-*
    tags:
      - v*
  pull_request:
    branches:
      - main
+      - rel-*

 jobs:
  Lint-Style:
    name: Lint & check code style
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
      - name: Setup Nix Environment
        uses: ./.github/actions/setup-nix
        with:
@@ -35,39 +37,19 @@ jobs:
        # https://github.com/actions/runner/issues/241#issuecomment-842566950
        shell: script -qec "bash --noprofile --norc -eo pipefail {0}"
    steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
      - name: Setup Nix Environment
        uses: ./.github/actions/setup-nix
        with:
-          tools: tests withTools
+          tools: tests

      - name: Run coverage (IO tests and Spec tests against PostgreSQL 14)
        run: postgrest-coverage
      - name: Upload coverage to codecov
-        uses: codecov/codecov-action@v2.1.0
+        uses: codecov/codecov-action@v3.1.0
        with:
          files: ./coverage/codecov.json

-      - name: Run the spec tests against PostgreSQL 13
-        if: always()
-        run: postgrest-with-postgresql-13 postgrest-test-spec
-      - name: Run the spec tests against PostgreSQL 12
-        if: always()
-        run: postgrest-with-postgresql-12 postgrest-test-spec
-      - name: Run the spec tests against PostgreSQL 11
-        if: always()
-        run: postgrest-with-postgresql-11 postgrest-test-spec
-      - name: Run the spec tests against PostgreSQL 10
-        if: always()
-        run: postgrest-with-postgresql-10 postgrest-test-spec
-      - name: Run the spec tests against PostgreSQL 9.6
-        if: always()
-        run: postgrest-with-postgresql-9.6 postgrest-test-spec
-
-      - name: Run query cost tests against all PostgreSQL versions
-        if: always()
-        run: postgrest-with-all postgrest-test-querycost
-
      - name: Run doctests
        if: always()
        run: nix-shell --run postgrest-test-doctests
@@ -77,11 +59,43 @@ jobs:
        run: postgrest-test-spec-idempotence


+  Test-Pg-Nix:
+    strategy:
+      fail-fast: false
+      matrix:
+        pgVersion: [9.6, 10, 11, 12, 13, 14]
+    name: Test PG ${{ matrix.pgVersion }} (Nix)
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        # Hack for enabling color output, see:
+        # https://github.com/actions/runner/issues/241#issuecomment-842566950
+        shell: script -qec "bash --noprofile --norc -eo pipefail {0}"
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup Nix Environment
+        uses: ./.github/actions/setup-nix
+        with:
+          tools: tests withTools
+
+      - name: Run spec tests
+        if: always()
+        run: postgrest-with-postgresql-${{ matrix.pgVersion }} postgrest-test-spec
+
+      - name: Run IO tests
+        if: always()
+        run: postgrest-with-postgresql-${{ matrix.pgVersion }} -f test/io/fixtures.sql postgrest-test-io
+
+      - name: Run query cost tests
+        if: always()
+        run: postgrest-with-postgresql-${{ matrix.pgVersion }} postgrest-test-querycost
+
+
  Test-Memory-Nix:
    name: Test memory (Nix)
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
      - name: Setup Nix Environment
        uses: ./.github/actions/setup-nix
        with:
@@ -90,20 +104,23 @@ jobs:
        run: postgrest-test-memory


-  Build-Nix:
+  Build-Static-Nix:
    name: Build Linux static (Nix)
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
      - name: Setup Nix Environment
        uses: ./.github/actions/setup-nix
        with:
          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+          tools: tests

      - name: Build static executable
        run: nix-build -A postgrestStatic
+      - name: Check static executable
+        run: postgrest-check-static result/bin/postgrest
      - name: Save built executable as artifact
-        uses: actions/upload-artifact@v2.2.4
+        uses: actions/upload-artifact@v3
        with:
          name: postgrest-linux-static-x64
          path: result/bin/postgrest
@@ -112,7 +129,7 @@ jobs:
      - name: Build Docker image
        run: nix-build -A docker.image --out-link postgrest-docker.tar.gz
      - name: Save built Docker image as artifact
-        uses: actions/upload-artifact@v2.2.4
+        uses: actions/upload-artifact@v3
        with:
          name: postgrest-docker-x64
          path: postgrest-docker.tar.gz
@@ -136,8 +153,6 @@ jobs:
            cache: |
              ~/.stack
              .stack-work
-            test: true
-            pgdir: /usr/lib/postgresql
            artifact: postgrest-ubuntu-x64

          - name: MacOS & test
@@ -145,8 +160,6 @@ jobs:
            cache: |
              ~/.stack
              .stack-work
-            test: true
-            pgdir: /usr/local/Cellar/postgresql
            artifact: postgrest-macos-x64

          - name: Windows
@@ -155,18 +168,15 @@ jobs:
              ~\AppData\Roaming\stack
              ~\AppData\Local\Programs\stack
              .stack-work
-            deps: |
-              stack exec -- pacman -S mingw64/mingw-w64-x86_64-postgresql --noconfirm
-            # We'd need to make test/with_tmp_db run on Windows first
-            # test: true
+            deps: Add-Content $env:GITHUB_PATH $env:PGBIN
            artifact: postgrest-windows-x64

    name: Build ${{ matrix.name }} (Stack)
    runs-on: ${{ matrix.runs-on }}
    steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
      - name: Stack working files cache
-        uses: actions/cache@v2.1.7
+        uses: actions/cache@v3
        with:
          path: ${{ matrix.cache }}
          key: ${{ runner.os }}-${{ hashFiles('stack.yaml.lock') }}
@@ -175,14 +185,8 @@ jobs:
        run: ${{ matrix.deps }}
      - name: Build with Stack
        run: stack build --local-bin-path result --copy-bins
-      - name: Run Spec tests with Stack
-        if: ${{ matrix.test }}
-        run: |
-          postgresql_bin="$(find ${{ matrix.pgdir }} -maxdepth 2 -type d -name bin | head -n 1)"
-          echo "Using PostgreSQL binaries at $postgresql_bin ..."
-          PATH="$postgresql_bin:$PATH" test/with_tmp_db stack test
      - name: Save built executable as artifact
-        uses: actions/upload-artifact@v2.2.4
+        uses: actions/upload-artifact@v3
        with:
          name: ${{ matrix.artifact }}
          path: |
@@ -190,24 +194,78 @@ jobs:
            result/postgrest.exe
          if-no-files-found: error

-
  Get-FreeBSD-CirrusCI:
    name: Get FreeBSD build from CirrusCI
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
      - name: Get FreeBSD executable from CirrusCI
        env:
          # GITHUB_SHA does weird things for pull request, so we roll our own:
          GITHUB_COMMIT: ${{github.event.pull_request.head.sha || github.sha}}
        run: .github/get_cirrusci_freebsd
      - name: Save executable as artifact
-        uses: actions/upload-artifact@v2.2.4
+        uses: actions/upload-artifact@v3
        with:
          name: postgrest-freebsd-x64
          path: postgrest
          if-no-files-found: error

+  Build-Cabal-Arm:
+    name: Build aarch64 (Cabal)
+    if: ${{ github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/v') || startsWith(github.ref, 'refs/heads/rel-') }}
+    runs-on: ubuntu-latest
+    outputs:
+      remotepath: ${{ steps.Remote-Dir.outputs.remotepath }}
+    env:
+      GITHUB_COMMIT: ${{ github.sha }}
+    steps:
+      - uses: actions/checkout@v2.4.0
+      - id: Remote-Dir
+        name: Unique directory name for the remote build
+        run: echo "::set-output name=remotepath::postgrest-build-$(uuidgen)"
+      - name: Copy script files to the remote server
+        uses: appleboy/scp-action@master
+        with:
+          host: ${{ secrets.SSH_ARM_HOST }}
+          username: ubuntu
+          key: ${{ secrets.SSH_ARM_PRIVATE_KEY }}
+          fingerprint: ${{ secrets.SSH_ARM_FINGERPRINT }}
+          source: ".github/scripts/arm/*"
+          target: ${{ steps.Remote-Dir.outputs.remotepath }}
+          strip_components: 3
+      - name: Build ARM
+        uses: appleboy/ssh-action@master
+        env:
+          REMOTE_DIR: ${{ steps.Remote-Dir.outputs.remotepath }}
+        with:
+          host: ${{ secrets.SSH_ARM_HOST }}
+          username: ubuntu
+          key: ${{ secrets.SSH_ARM_PRIVATE_KEY }}
+          fingerprint: ${{ secrets.SSH_ARM_FINGERPRINT }}
+          command_timeout: 120m
+          script_stop: true
+          envs: GITHUB_COMMIT,REMOTE_DIR
+          script: bash ~/$REMOTE_DIR/build.sh "$GITHUB_COMMIT" "$REMOTE_DIR"
+      - name: Download binaries from remote server
+        uses: nicklasfrahm/scp-action@main
+        with:
+          direction: download
+          host: ${{ secrets.SSH_ARM_HOST }}
+          username: ubuntu
+          key: ${{ secrets.SSH_ARM_PRIVATE_KEY }}
+          fingerprint: ${{ secrets.SSH_ARM_FINGERPRINT }}
+          source: "${{ steps.Remote-Dir.outputs.remotepath }}/result.tar.xz"
+          target: "result.tar.xz"
+      - name: Extract downloaded binaries
+        run: tar -xvf result.tar.xz && rm result.tar.xz
+      - name: Save aarch64 executable as artifact
+        uses: actions/upload-artifact@v2.3.1
+        with:
+          name: postgrest-ubuntu-aarch64
+          path: result/postgrest
+          if-no-files-found: error
+

  Prepare-Release:
    name: Prepare release
@@ -216,15 +274,17 @@ jobs:
    needs:
      - Lint-Style
      - Test-Nix
+      - Test-Pg-Nix
      - Test-Memory-Nix
-      - Build-Nix
+      - Build-Static-Nix
      - Build-Stack
-      - Get-FreeBSD-CirrusCI
+      #- Get-FreeBSD-CirrusCI
+      - Build-Cabal-Arm
    outputs:
      version: ${{ steps.Identify-Version.outputs.version }}
      isprerelease: ${{ steps.Identify-Version.outputs.isprerelease }}
    steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
      - id: Identify-Version
        name: Identify the version to be released
        run: |
@@ -261,7 +321,7 @@ jobs:
          echo "Relevant extract from CHANGELOG.md:"
          cat CHANGES.md
      - name: Save CHANGES.md as artifact
-        uses: actions/upload-artifact@v2.2.4
+        uses: actions/upload-artifact@v3
        with:
          name: release-changes
          path: CHANGES.md
@@ -277,9 +337,9 @@ jobs:
    env:
      VERSION: ${{ needs.Prepare-Release.outputs.version }}
    steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
      - name: Download all artifacts
-        uses: actions/download-artifact@v2.0.10
+        uses: actions/download-artifact@v3
        with:
          path: artifacts
      - name: Create release bundle with archives for all builds
@@ -299,14 +359,18 @@ jobs:
          tar cJvf "release-bundle/postgrest-v$VERSION-macos-x64.tar.xz" \
            -C artifacts/postgrest-macos-x64 postgrest

-          tar cJvf "release-bundle/postgrest-v$VERSION-freebsd-x64.tar.xz" \
-            -C artifacts/postgrest-freebsd-x64 postgrest
+          # TODO: Fix timeouts for FreeBSD builds in Cirrus
+          #tar cJvf "release-bundle/postgrest-v$VERSION-freebsd-x64.tar.xz" \
+          #  -C artifacts/postgrest-freebsd-x64 postgrest
+
+          tar cJvf "release-bundle/postgrest-v$VERSION-ubuntu-aarch64.tar.xz" \
+            -C artifacts/postgrest-ubuntu-aarch64 postgrest

          zip "release-bundle/postgrest-v$VERSION-windows-x64.zip" \
            artifacts/postgrest-windows-x64/postgrest.exe

      - name: Save release bundle
-        uses: actions/upload-artifact@v2.2.4
+        uses: actions/upload-artifact@v3
        with:
          name: release-bundle
          path: release-bundle
@@ -329,25 +393,29 @@ jobs:
  Release-Docker:
    name: Release on Docker Hub
    runs-on: ubuntu-latest
-    needs: Prepare-Release
+    needs:
+      - Build-Cabal-Arm
+      - Prepare-Release
    env:
+      GITHUB_COMMIT: ${{ github.sha }}
      DOCKER_REPO: postgrest
      DOCKER_USER: stevechavez
+      DOCKER_PASS: ${{ secrets.DOCKER_PASS }}
      VERSION: ${{ needs.Prepare-Release.outputs.version }}
      ISPRERELEASE: ${{ needs.Prepare-Release.outputs.isprerelease }}
    steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
      - name: Setup Nix Environment
        uses: ./.github/actions/setup-nix
        with:
          tools: release
      - name: Download Docker image
-        uses: actions/download-artifact@v2.0.10
+        uses: actions/download-artifact@v3
        with:
          name: postgrest-docker-x64
      - name: Publish images on Docker Hub
        run: |
-          docker login -u "$DOCKER_USER" -p "${{ secrets.DOCKER_PASS }}"
+          docker login -u "$DOCKER_USER" -p "$DOCKER_PASS"
          docker load -i postgrest-docker.tar.gz

          docker tag postgrest:latest "$DOCKER_REPO/postgrest:v$VERSION"
@@ -361,13 +429,48 @@ jobs:
          else
            echo "Skipping pushing to 'latest' tag for v$VERSION pre-release..."
          fi
-      - name: Update descriptions on Docker Hub
+      - name: Publish images for ARM builds on Docker Hub
+        uses: appleboy/ssh-action@master
        env:
-          DOCKER_PASS: ${{ secrets.DOCKER_PASS }}
-        run: |
-          if [[ -z "$ISPRERELEASE" ]]; then
-            echo "Updating description on Docker Hub..."
-            postgrest-release-dockerhub-description
-          else
-            echo "Skipping updating description for pre-release..."
-          fi
+          REMOTE_DIR: ${{ needs.Build-Cabal-Arm.outputs.remotepath }}
+        with:
+          host: ${{ secrets.SSH_ARM_HOST }}
+          username: ubuntu
+          key: ${{ secrets.SSH_ARM_PRIVATE_KEY }}
+          fingerprint: ${{ secrets.SSH_ARM_FINGERPRINT }}
+          script_stop: true
+          envs: GITHUB_COMMIT,DOCKER_REPO,DOCKER_USER,DOCKER_PASS,REMOTE_DIR,VERSION,ISPRERELEASE
+          script: bash ~/$REMOTE_DIR/docker-publish.sh "$GITHUB_COMMIT" "$DOCKER_REPO" "$DOCKER_USER" "$DOCKER_PASS" "$REMOTE_DIR" "$VERSION" "$ISPRERELEASE"
+# TODO: Enable dockerhub description update again, once a solution for the permission problem is found:
+# https://github.com/docker/hub-feedback/issues/1927
+#      - name: Update descriptions on Docker Hub
+#        env:
+#          DOCKER_PASS: ${{ secrets.DOCKER_PASS }}
+#        run: |
+#          if [[ -z "$ISPRERELEASE" ]]; then
+#            echo "Updating description on Docker Hub..."
+#            postgrest-release-dockerhub-description
+#          else
+#            echo "Skipping updating description for pre-release..."
+#          fi
+
+  Clean-Arm-Server:
+    name: Remove copied files from server
+    needs:
+      - Build-Cabal-Arm
+      - Release-Docker
+    if: ${{ always() && (github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/v') || startsWith(github.ref, 'refs/heads/rel-')) }}
+    runs-on: ubuntu-latest
+    env:
+      REMOTE_DIR: ${{ needs.Build-Cabal-Arm.outputs.remotepath }}
+    steps:
+      - uses: actions/checkout@v2.4.0
+      - name: Remove uploaded files from server
+        uses: appleboy/ssh-action@master
+        with:
+          host: ${{ secrets.SSH_ARM_HOST }}
+          username: ubuntu
+          key: ${{ secrets.SSH_ARM_PRIVATE_KEY }}
+          fingerprint: ${{ secrets.SSH_ARM_FINGERPRINT }}
+          envs: REMOTE_DIR
+          script: rm -rf $REMOTE_DIR
@@ -0,0 +1,34 @@
+name: Loadtest
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - v*
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  Loadtest-Nix:
+    name: Loadtest (Nix)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Setup Nix Environment
+        uses: ./.github/actions/setup-nix
+        with:
+          tools: loadtest
+      - name: Run loadtest
+        run: |
+          postgrest-loadtest-against main
+          postgrest-loadtest-report > loadtest/loadtest.md
+      - name: Upload report
+        uses: actions/upload-artifact@v3
+        with:
+          name: loadtest.md
+          path: loadtest/loadtest.md
+          if-no-files-found: error
@@ -21,3 +21,5 @@ __pycache__
 *.tix
 coverage
 .hpc
+loadtest
+.history
@@ -5,10 +5,109 @@ This project adheres to [Semantic Versioning](http://semver.org/).

 ## Unreleased

+## [10.0.0] - 2022-08-18
+
 ### Added

+ - #1933, #2109, Add a minimal health check endpoint - @steve-chavez
+   + For enabling this, the `admin-server-port` config must be set explictly
+   + A `<host>:<admin_server_port>/live` endpoint is available for checking if postgrest is running on its port/socket. 200 OK = alive, 503 = dead.
+   + A `<host>:<admin_server_port>/ready` endpoint is available for checking a correct internal state(the database connection plus the schema cache). 200 OK = ready, 503 = not ready.
+ - #1988, Add the current user to the request log on stdout - @DavidLindbom, @wolfgangwalther
+ - #1823, Add the ability to run postgrest without any configuration. - @wolfgangwalther
+   + #1991, Add the ability to run without `db-uri` using libpq's PG environment variables to connect. - @wolfgangwalther
+   + #1769, Add the ability to run without `db-schemas`, defaulting to `db-schemas=public`. - @wolfgangwalther
+   + #1689, Add the ability to run without `db-anon-role` disabling anonymous access. - @wolfgangwalther
+ - #1543, Allow access to fields of composite types in select=, order= and filters through JSON operators -> and ->>. - @wolfgangwalther
+ - #2075, Allow access to array items in ?select=, ?order= and filters through JSON operators -> and ->>. - @wolfgangwalther
+ - #2156, #2211, Allow applying `limit/offset` to UPDATE/DELETE to only affect a subset of rows - @steve-chavez
+   + It requires an explicit `order` on a unique column(s)
+ - #1917, Add error codes with the `"PGRST"` prefix to the error response body to differentiate PostgREST errors from PostgreSQL errors - @laurenceisla
+ - #1917, Normalize the error response body by always having the `detail` and `hint` error fields with a `null` value if they are empty - @laurenceisla
+ - #2176, Errors raised with `SQLSTATE` now include the message and the code in the response body - @laurenceisla
+ - #2236, Support POSIX regular expression operators for row filtering - @enote-kane
+ - #2202, Allow returning XML from RPCs - @fjf2002
+ - #2268, Allow returning XML from single-column queries - @fjf2002
+ - #2300, RPC POST for function w/single unnamed XML param #2300 - @fjf2002
+ - #1564, Allow geojson output by specifying the `Accept: application/geo+json` media type - @steve-chavez
+   + Requires postgis >= 3.0
+   + Works for GET, RPC, POST/PATCH/DELETE with `Prefer: return=representation`.
+   + Resource embedding works and the embedded rows will go into the `properties` key
+   + In case of multiple geometries in the same table, you can choose which one will go into the `geometry` key with the usual `?select` query parameter.
+ - #1082, Add security definitions to the OpenAPI output - @laurenceisla
+ - #2378, Support http OPTIONS method on RPC and root path - @steve-chavez
+ - #2354, Allow getting the EXPLAIN plan of a request by using the `Accept: application/vnd.pgrst.plan` header - @steve-chavez
+   + Only allowed if the `db-plan-enabled` config is set to true
+   + Can generate the plan for different media types using the `for` parameter: `Accept: application/vnd.pgrst.plan; for="application/vnd.pgrst.object"`
+   + Different options for the plan can be used with the `options` parameter: `Accept: application/vnd.pgrst.plan; options=analyze|verbose|settings|buffers|wal`
+   + The plan can be obtained in text or json by using different media type suffixes: `Accept: application/vnd.pgrst.plan+text` and `Accept: application/vnd.pgrst.plan+json`.
+ - #2144, Support computed relationships which allow extending and overriding relationships for resource embedding - @steve-chavez, @wolfgangwalther
+ - #1984, Detect one-to-one relationships for resource embedding - @steve-chavez
+   + Detected when there's a foreign key with a unique constraint or when a foreign key is also a primary key
+
 ### Fixed

+ - #2058, Return 204 No Content without Content-Type for PUT - @wolfgangwalther
+ - #2107, Clarify error for failed schema cache load. - @steve-chavez
+   + From `Database connection lost. Retrying the connection` to `Could not query the database for the schema cache. Retrying.`
+ - #1771, Fix silently ignoring filter on a non-existent embedded resource - @steve-chavez
+ - #2152, Remove functions, which are uncallable because of unnamend arguments from schema cache and OpenAPI output. - @wolfgangwalther
+ - #2145, Fix accessing json array fields with -> and ->> in ?select= and ?order=. - @wolfgangwalther
+ - #2155, Ignore `max-rows` on POST, PATCH, PUT and DELETE - @steve-chavez
+ - #2254, Fix inferring a foreign key column as a primary key column on views - @steve-chavez
+ - #2070, Restrict generated many-to-many relationships - @steve-chavez
+   + Only adds many-to-many relationships when: a table has FKs to two other tables and these FK columns are part of the table's PK columns.
+ - #2278, Allow casting to types with underscores and numbers(e.g. `select=oid_array::_int4`) - @steve-chavez
+ - #2277, #2238, #1643, Prevent views from breaking one-to-many/many-to-one embeds when using column or FK as target - @steve-chavez
+    + When using a column or FK as target for embedding(`/tbl?select=*,col-or-fk(*)`), only tables are now detected and views are not.
+    + You can still use a column or an inferred FK on a view to embed a table(`/view?select=*,col-or-fk(*)`)
+ - #2317, Increase the `db-pool-timeout` to 1 hour to prevent frequent high connection latency - @steve-chavez
+ - #2341, The search path now correctly identifies schemas with uppercase and special characters in their names (regression) - @laurenceisla
+ - #2364, "404 Not Found" on nested routes and "405 Method Not Allowed" errors no longer start an empty database transaction - @steve-chavez
+ - #2342, Fix inaccurate result count when an inner embed was selected after a normal embed in the query string - @laurenceisla
+ - #2376, OPTIONS requests no longer start an empty database transaction - @steve-chavez
+ - #2395, Allow using columns with dollar sign($) without double quoting in filters and `select` - @steve-chavez
+ - #2410, Fix loop crash error on startup in Postgres 15 beta 3. Log: "UNION types \"char\" and text cannot be matched". - @yevon
+ - #2397, Fix race conditions managing database connection helper - @robx
+ - #2269, Allow `limit=0` in the request query to return an empty array - @gautam1168, @laurenceisla
+
+### Changed
+
+ - #2001, Return 204 No Content without Content-Type for RPCs returning VOID - @wolfgangwalther
+   + Previously, those RPCs would return "null" as a body with Content-Type: application/json.
+ - #2156, `limit/offset` now limits the affected rows on UPDATE/DELETE  - @steve-chavez
+   + Previously, `limit/offset` only limited the returned rows but not the actual updated rows
+ - #2155, `max-rows` is no longer applied on POST/PATCH/PUT/DELETE returned rows - @steve-chavez
+   + This was misleading because the affected rows were not really affected by `max-rows`, only the returned rows were limited
+ - #2070, Restrict generated many-to-many relationships - @steve-chavez
+   + A primary key that contains the foreign key columns is now needed for generating many-to-many relationships.
+ - #2277, Views now are not detected when embedding using the column or FK as target (`/view?select=*,column(*)`) - @steve-chavez
+   + This embedding form was easily made ambiguous whenever a new view was added.
+   + You can use computed relationships to keep this embedding form working
+ - #2312, Using `Prefer: return=representation` no longer returns a `Location` header - @laurenceisla
+ - #1984, For the cases where one to one relationships are detected, json objects will be returned instead of json arrays of length 1
+   + If you wish to override this behavior, you can use computed relationships to return arrays again
+
+## [9.0.1] - 2022-06-03
+
+### Fixed
+
+- #2165, Fix json/jsonb columns should not have type in OpenAPI spec - @clrnd
+- #2020, Execute deferred constraint triggers when using `Prefer: tx=rollback` - @wolfgangwalther
+- #2077, Fix `is` not working with upper or mixed case values like `NULL, TrUe, FaLsE` - @steve-chavez
+- #2024, Fix schema cache loading when views with XMLTABLE and DEFAULT are present - @wolfgangwalther
+- #1724, Fix wrong CORS header Authentication -> Authorization - @wolfgangwalther
+- #2120, Fix reading database configuration properly when `=` is present in value - @wolfgangwalther
+- #2135, Remove trigger functions from schema cache and OpenAPI output, because they can't be called directly anyway. - @wolfgangwalther
+- #2101, Remove aggregates, procedures and window functions from the schema cache and OpenAPI output. - @wolfgangwalther
+- #2153, Fix --dump-schema running with a wrong PG version. - @wolfgangwalther
+- #2042, Keep working when EMFILE(Too many open files) is reached. - @steve-chavez
+- #2147, Ignore `Content-Type` headers for `GET` requests when calling RPCs. - @laurenceisla
+    + Previously, `GET` without parameters, but with `Content-Type: text/plain` or `Content-Type: application/octet-stream` would fail with `404 Not Found`, even if a function without arguments was available.
+- #2239, Fix misleading disambiguation error where the content of the `relationship` key looks like valid syntax - @laurenceisla
+- #2294, Disable parallel GC for better performance on higher core CPUs - @steve-chavez
+- #1076, Fix using CPU while idle - @steve-chavez
+
 ## [9.0.0] - 2021-11-25

 ### Added
@@ -2,9 +2,6 @@

 [![Donate](https://img.shields.io/badge/Donate-Patreon-orange.svg?colorB=F96854)](https://www.patreon.com/postgrest)
 [![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.me/postgrest)
-<a href="https://heroku.com/deploy?template=https://github.com/PostgREST/postgrest">
-  <img src="https://img.shields.io/badge/%E2%86%91_Deploy_to-Heroku-7056bf.svg" alt="Deploy">
-</a>
 [![Join the chat at https://gitter.im/begriffs/postgrest](https://img.shields.io/badge/gitter-join%20chat%20%E2%86%92-brightgreen.svg)](https://gitter.im/begriffs/postgrest)
 [![Docs](https://img.shields.io/badge/docs-latest-brightgreen.svg?style=flat)](http://postgrest.org)
 [![Docker Stars](https://img.shields.io/docker/pulls/postgrest/postgrest.svg)](https://hub.docker.com/r/postgrest/postgrest/)
@@ -1,59 +0,0 @@
-{
-  "name": "PostgREST",
-  "description": "RESTful API for any PostgreSQL database.",
-  "logo": "https://avatars2.githubusercontent.com/u/15115011",
-  "repository": "https://github.com/PostgREST/postgrest",
-  "env": {
-    "BUILDPACK_URL": {
-      "description": "Heroku buildpack for deploying Haskell applications",
-      "value": "https://github.com/PostgREST/postgrest-heroku"
-    },
-    "POSTGREST_VER": {
-      "description": "Version of PostgREST to deploy",
-      "value": "8.0.0"
-    },
-    "DB_URI": {
-      "description": "Database connection string, e.g. postgres://user:pass@xxxxxxx.rds.amazonaws.com/mydb",
-      "required": true
-    },
-    "DB_SCHEMA": {
-      "description": "The database schema to expose to REST clients. Tables, views and stored procedures in this schema will get API endpoints",
-      "required": true,
-      "value": "public"
-    },
-    "DB_ANON_ROLE": {
-      "description": "The database role to use when executing commands on behalf of unauthenticated clients",
-      "required": true
-    },
-    "DB_POOL": {
-      "description": "Number of connections to keep open in PostgREST’s database pool",
-      "required": false,
-      "value": "10"
-    },
-    "SERVER_PROXY_URI": {
-      "description": "Overrides the base URL used within the OpenAPI self-documentation hosted at the API root path",
-      "required": false
-    },
-    "JWT_SECRET": {
-      "description": "The secret used to decode JWT tokens clients provide for authentication",
-      "required": false
-    },
-    "SECRET_IS_BASE64": {
-      "description": "When this is set to true, the value derived from jwt-secret will be treated as a base64 encoded secret",
-      "required": false,
-      "value": "false"
-    },
-    "JWT_AUD": {
-      "description": "The audience that should be validated if the JWT token contains an aud claim",
-      "required": false
-    },
-    "MAX_ROWS": {
-      "description": "A hard limit to the number of rows PostgREST will fetch from a view, table, or stored procedure",
-      "required": false
-    },
-    "PRE_REQUEST": {
-      "description": "A schema-qualified stored procedure name to call right after switching roles for a client request",
-      "required": false
-    }
-  }
-}
@@ -1,9 +1,11 @@
+{ system ? builtins.currentSystem }:
+
 let
  name =
    "postgrest";

  compiler =
-    "ghc8107";
+    "ghc924";

  # PostgREST source files, filtered based on the rules in the .gitignore files
  # and file extensions. We want to include as litte as possible, as the files
@@ -42,16 +44,16 @@ let

  # Evaluated expression of the Nixpkgs repository.
  pkgs =
-    import nixpkgs { inherit overlays; };
+    import nixpkgs { inherit overlays system; };

  postgresqlVersions =
    [
-      { name = "postgresql-14"; postgresql = pkgs.postgresql_14; }
-      { name = "postgresql-13"; postgresql = pkgs.postgresql_13; }
-      { name = "postgresql-12"; postgresql = pkgs.postgresql_12; }
-      { name = "postgresql-11"; postgresql = pkgs.postgresql_11; }
-      { name = "postgresql-10"; postgresql = pkgs.postgresql_10; }
-      { name = "postgresql-9.6"; postgresql = pkgs.postgresql_9_6; }
+      { name = "postgresql-14"; postgresql = pkgs.postgresql_14.withPackages (p: [ p.postgis p.pg_safeupdate ]); }
+      { name = "postgresql-13"; postgresql = pkgs.postgresql_13.withPackages (p: [ p.postgis p.pg_safeupdate ]); }
+      { name = "postgresql-12"; postgresql = pkgs.postgresql_12.withPackages (p: [ p.postgis p.pg_safeupdate ]); }
+      { name = "postgresql-11"; postgresql = pkgs.postgresql_11.withPackages (p: [ p.postgis p.pg_safeupdate ]); }
+      { name = "postgresql-10"; postgresql = pkgs.postgresql_10.withPackages (p: [ p.postgis p.pg_safeupdate ]); }
+      { name = "postgresql-9.6"; postgresql = pkgs.postgresql_9_6.withPackages (p: [ p.postgis p.pg_safeupdate ]); }
    ];

  patches =
@@ -64,7 +66,7 @@ let
  # Function that derives a fully static Haskell package based on
  # nh2/static-haskell-nix
  staticHaskellPackage =
-    import nix/static-haskell-package.nix { inherit nixpkgs compiler patches allOverlays; };
+    import nix/static-haskell-package.nix { inherit nixpkgs system compiler patches allOverlays; };

  # Options passed to cabal in dev tools and tests
  devCabalOptions =
@@ -123,6 +125,10 @@ rec {
  docker =
    pkgs.callPackage nix/tools/docker { postgrest = postgrestStatic; };

+  # Load testing tools.
+  loadtest =
+    pkgs.callPackage nix/tools/loadtest.nix { inherit withTools; };
+
  # Script for running memory tests.
  memory =
    pkgs.callPackage nix/tools/memory.nix { inherit postgrestProfiled withTools; };
@@ -145,8 +151,9 @@ rec {
      inherit postgrest devCabalOptions withTools;
      ghc = pkgs.haskell.compiler."${compiler}";
      inherit (pkgs.haskell.packages."${compiler}") hpc-codecov;
+      inherit (pkgs.haskell.packages."${compiler}") weeder;
    };

  withTools =
-    pkgs.callPackage nix/tools/withTools.nix { inherit postgresqlVersions; };
+    pkgs.callPackage nix/tools/withTools.nix { inherit devCabalOptions postgresqlVersions postgrest; };
 }
@@ -2,15 +2,11 @@

 module Main (main) where

-import qualified Data.Map.Strict as M
-
 import System.IO (BufferMode (..), hSetBuffering)

 import qualified PostgREST.App as App
 import qualified PostgREST.CLI as CLI

-import PostgREST.Config (readPGRSTEnvironment)
-
 import Protolude

 #ifndef mingw32_HOST_OS
@@ -20,8 +16,7 @@ import qualified PostgREST.Unix as Unix
 main :: IO ()
 main = do
  setBuffering
-  hasPGRSTEnv <- not . M.null <$> readPGRSTEnvironment
-  opts <- CLI.readCLIShowHelp hasPGRSTEnv
+  opts <- CLI.readCLIShowHelp
  CLI.main installSignalHandlers runAppInSocket opts

 installSignalHandlers :: App.SignalHandlerInstaller
@@ -149,13 +149,13 @@ the PostgREST repo. Paths are resolved relative to the repo root:
 $ cd src
 # Even though the current directory is ./src, the config path must still start
 # from the repo root:
-$ postgrest-run test/io-tests/configs/simple.conf
+$ postgrest-run test/io/configs/simple.conf
 ```

 ## Testing

-In nix-shell, you'll find utility scripts that make it very easy to run the
-Haskell test suite, including setting up all required dependencies and
+In nix-shell, you'll find utility scripts that make it very easy to run our
+test suite, including setting up all required dependencies and
 temporary test databases:

 ```bash
@@ -182,7 +182,55 @@ postgrest-test-io -k config
 # Run tests in parallel using xdist, specifying the number of processes:
 postgrest-test-io -n auto
 postgrest-test-io -n 8
+```

+The memory tests check that we don't surpass a memory threshold for big request bodies.
+
+```bash
+# Build the dependencies needed for the memory test
+nix-shell --arg memory true
+
+# Run the memory test
+postgrest-test-memory
+```
+
+The loadtests ensure that performance doesn't drop on a change. Underlyingly they use
+[vegeta](https://github.com/tsenart/vegeta).
+
+```bash
+# Run the loadtests on the latest commit(HEAD)
+postgrest-loadtest
+
+# You can loadtest comparing to a different branch
+postgrest-loadtest-against master
+
+# Produce a markdown report to be used on CI
+postgrest-loadtest-report
+```
+
+Our query cost tests ensure that our generated queries don't surpass a threshold EXPLAIN cost.
+
+```bash
+postgrest-test-querycost
+```
+
+doctests for some of our modules are also available:
+
+```bash
+postgrest-test-doctest
+```
+
+## Code coverage
+
+Code coverage is available under the `postgrest-coverage` command. This will produce a `./coverage` directory that can be visualized with a simple http server.
+
+```bash
+# Will run all the tests and produce a coverage dir
+postgrest-coverage
+
+# Visualize the output
+cd coverage
+python -mSimpleHTTPServer 8080
 ```

 ## Linting and styling code
@@ -24,21 +24,22 @@ import qualified Data.Text                               as T
 import qualified Data.Text.IO                            as T
 import qualified Dot
 import qualified GHC
+import qualified GHC.Paths
 import qualified Language.Haskell.GHC.ExactPrint.Parsers as ExactPrint
 import qualified Options.Applicative                     as O
 import qualified System.FilePath                         as FP

-import Bag                        (bagToList)
 import Data.Aeson.Encode.Pretty   (encodePretty)
 import Data.Function              ((&))
 import Data.List                  (intercalate)
 import Data.Maybe                 (catMaybes, mapMaybe)
 import Data.Text                  (Text)
+import GHC.Data.Bag               (bagToList)
 import GHC.Generics               (Generic)
 import GHC.Hs.Extension           (GhcPs)
-import Module                     (moduleNameString)
-import OccName                    (occNameString)
-import RdrName                    (rdrNameOcc)
+import GHC.Types.Name.Occurrence  (occNameString)
+import GHC.Types.Name.Reader      (rdrNameOcc)
+import GHC.Unit.Module.Name       (moduleNameString)
 import System.Directory.Recursive (getFilesRecursive)
 import System.Exit                (exitFailure)

@@ -197,11 +198,11 @@ sourceSymbols source = do
      return $ concatMap (importSymbols source filepath . GHC.unLoc) hsmodImports

 -- | Parse a Haskell module
-parseModule :: String -> IO (GHC.HsModule GhcPs)
+parseModule :: FilePath -> IO GHC.HsModule
 parseModule filepath = do
-  result <- ExactPrint.parseModule filepath
+  result <- ExactPrint.parseModule GHC.Paths.libdir filepath
  case result of
-    Right (_, hsmod) ->
+    Right hsmod ->
      return $ GHC.unLoc hsmod
    Left errs ->
      fail $ "Errors with " <> show filepath <> ":\n    "
@@ -212,7 +213,6 @@ parseModule filepath = do
 -- If the import is a wildcard, i.e. no symbols are selected for import, then
 -- only one item is returned.
 importSymbols :: FilePath -> FilePath -> GHC.ImportDecl GhcPs -> [ImportedSymbol]
-importSymbols _ _  (GHC.XImportDecl _) = mempty
 importSymbols source filepath GHC.ImportDecl{..} =
  case ideclHiding of
    Just (hiding, syms) ->
@@ -16,15 +16,20 @@ let
  ghc = ghcWithPackages modules;
  hsie =
    runCommand "haskellimports" { inherit name src; }
-      "${ghc}/bin/ghc -O -Werror -Wall -package ghc $src -o $out";
+      ''
+        cd $TMP
+        cp $src $TMP/Main.hs
+        ${ghc}/bin/ghc -O -Werror -Wall -package ghc Main.hs -o Main
+        cp Main $out
+      '';
  bin =
    runCommand name { inherit hsie name; }
      ''
        mkdir -p $out/bin
        ln -s $hsie $out/bin/$name
      '';
-  bashCompletion =
+  bash-completion =
    runCommand "${name}-bash-completion" { inherit bin name; }
      "$bin/bin/$name --bash-completion-script $bin/bin/$name > $out";
 in
-hsie // { inherit bashCompletion bin; }
+hsie // { inherit bash-completion bin; }
@@ -1,6 +1,6 @@
 # Pinned version of Nixpkgs, generated with postgrest-nixpkgs-upgrade.
 {
-  date = "2021-11-02";
-  rev = "7053541084bf5ce2921ef307e5585d39d7ba8b3f";
-  tarballHash = "1flhh5d4zy43x6060hvzjb5hi5cmc51ivc0nwmija9n8d35kcc4x";
+  date = "2022-08-09";
+  rev = "9f15d6c3a74d2778c6e1af67947c95f100dc6fd2";
+  tarballHash = "14axdmi3kb6rlib39ik42yq907bm66x6vzswm5w1rsnw9vzgm31a";
 }
@@ -1,11 +1,11 @@
-# Creates an environment that exposes bashCompletion arguments from all checkedShellScripts
+# Creates an environment that exposes bash-completion arguments from all checkedShellScripts
 { buildEnv }:
 { name
 , tools
 , extra ? { }
 }:
 let
-  bashCompletion = builtins.map (tool: tool.bashCompletion) tools;
+  bash-completion = builtins.map (tool: tool.bash-completion) tools;

  env = buildEnv {
    inherit name;
@@ -13,4 +13,4 @@ let
  };

 in
-env // { inherit bashCompletion; } // extra
+env // { inherit bash-completion; } // extra
@@ -14,7 +14,7 @@
 { name
 , docs
 , args ? [ ]
-, addCommandCompletion ? false
+, positionalCompletion ? ""
 , inRootDir ? false
 , redirectTixFiles ? true
 , withEnv ? null
@@ -22,11 +22,10 @@
 , withTmpDir ? false
 }: text:
 let
+  # square brackets are a pain to escape - if even possible. just don't use them...
+  escape = builtins.replaceStrings [ "\n" ] [ " \\n" ];
+
  argsTemplate =
-    let
-      # square brackets are a pain to escape - if even possible. just don't use them...
-      escapedDocs = builtins.replaceStrings [ "\n" ] [ " \\n" ] docs;
-    in
    writeTextFile {
      inherit name;
      destination = "/${name}.m4"; # destination is needed to have the proper basename for completion
@@ -37,7 +36,7 @@ let
          # stripping the /nix/store/... path for nicer display
          BASH_ARGV0="$(basename "$0")"

-          # ARG_HELP([${name}], [${escapedDocs}])
+          # ARG_HELP([${name}], [${escape docs}])
          ${lib.strings.concatMapStrings (arg: "# " + arg) args}
          # ARG_POSITIONAL_DOUBLEDASH()
          # ARG_DEFAULTS_POS()
@@ -59,14 +58,14 @@ let
        sed '/_positionals_count + 1/a\\t\t\t\tset -- "''${@:1:1}" "--" "''${@:2}"' -i $out
      '';

-  bashCompletion =
+  bash-completion =
    runCommand "${name}-completion" { } (
      ''
        ${argbash}/bin/argbash --type completion --strip all ${argsTemplate}/${name}.m4 > $out
      ''

-      + lib.optionalString addCommandCompletion ''
-        sed 's/COMPREPLY.*compgen -o bashdefault .*$/_command/' -i $out
+      + lib.optionalString (positionalCompletion != "") ''
+        sed 's#COMPREPLY.*compgen -o bashdefault .*$#${escape positionalCompletion}#' -i $out
      ''
    );

@@ -139,4 +138,4 @@ let
  script =
    runCommand name { inherit bin name; } "ln -s $bin/bin/$name $out";
 in
-script // { inherit bin bashCompletion; }
+script // { inherit bin bash-completion; }
@@ -12,8 +12,8 @@ self: super:
      gitignoreSrc = super.fetchFromGitHub {
        owner = "hercules-ci";
        repo = "gitignore";
-        rev = "211907489e9f198594c0eb0ca9256a1949c9d412";
-        sha256 = "06j7wpvj54khw0z10fjyi31kpafkr6hi1k0di13k1xp8kywvfyx8";
+        rev = "a20de23b925fd8264fd7fad6454652e142fd7f73";
+        sha256 = "sha256-8DFJjXG8zqoONA1vXtgeKXy68KdJL5UaXR8NtVMUbx8=";
      };
    in
    (super.callPackage gitignoreSrc { }).gitignoreSource;
@@ -20,14 +20,17 @@ let
      # To get the sha256:
      #   nix-prefetch-url --unpack https://hackage.haskell.org/package/protolude-0.3.0/protolude-0.3.0.tar.gz

-      hasql-dynamic-statements =
-        lib.dontCheck (lib.unmarkBroken prev.hasql-dynamic-statements);
-
-      hasql-implicits =
-        lib.dontCheck (lib.unmarkBroken prev.hasql-implicits);
-
-      ptr =
-        lib.dontCheck (lib.unmarkBroken prev.ptr);
+      # To temporarily pin unreleased versions from GitHub:
+      #   <name> =
+      #     prev.callCabal2nixWithOptions "<name>" (super.fetchFromGitHub {
+      #       owner = "<owner>";
+      #       repo  = "<repo>";
+      #       rev = "<commit>";
+      #       sha256 = "<sha256>";
+      #    }) "--subpath=<subpath>" {};
+      #
+      # To get the sha256:
+      #   nix-prefetch-url --unpack https://github.com/<owner>/<repo>/archive/<commit>.tar.gz
    } // extraOverrides final prev;
 in
 {
@@ -2,19 +2,18 @@ self: super:
 # Overlay that adds legacy versions of PostgreSQL that are supported by
 # PostgREST.
 {
-  # PostgreSQL 9.5 was removed from Nixpkgs with
-  # https://github.com/NixOS/nixpkgs/commit/72ab382fb6b729b0d654f2c03f5eb25b39f11fbb
+  # PostgreSQL 9.6 was removed from Nixpkgs with
+  # https://github.com/NixOS/nixpkgs/commit/757dd008b2f2926fc0f7688fa8189f930ea47521
  # We pin its parent commit to get the last version that was available.
-  # postgresql_9_5 =
-  #  let
-  #    rev = "55ac7d4580c9ab67848c98cb9519317a1cc399c8";
-  #    tarballHash = "02ffj9f8s1hwhmxj85nx04sv64qb6jm7w0122a1dz9n32fymgklj";
-  #
-  #    pinnedPkgs =
-  #      builtins.fetchTarball {
-  #        url = "https://github.com/nixos/nixpkgs/archive/${rev}.tar.gz";
-  #        sha256 = tarballHash;
-  #      };
-  #  in
-  #  (import pinnedPkgs { }).pkgs.postgresql_9_5;
+  postgresql_9_6 =
+    let
+      rev = "571cbf3d1db477058303cef8754fb85a14e90eb7";
+      tarballHash = "0q74wn418i1bn5sssacmw8ykpmqvzr0s93sj6pbs3rf6bf134fkz";
+      pinnedPkgs =
+        builtins.fetchTarball {
+          url = "https://github.com/nixos/nixpkgs/archive/${rev}.tar.gz";
+          sha256 = tarballHash;
+        };
+    in
+    (import pinnedPkgs { }).pkgs.postgresql_9_6;
 }
@@ -18,7 +18,8 @@
        done
      '';

-  # See: https://github.com/NixOS/nixpkgs/pull/87879
-  nixpkgs-openssl-split-runtime-dependencies-of-static-builds =
-    ./nixpkgs-openssl-split-runtime-dependencies-of-static-builds.patch;
+  static-haskell-nix-ncurses =
+    ./static-haskell-nix-ncurses.patch;
+  static-haskell-nix-ghc-bignum =
+    ./static-haskell-nix-ghc-bignum.patch;
 }
@@ -1,76 +0,0 @@
-diff --git a/pkgs/development/libraries/openssl/default.nix b/pkgs/development/libraries/openssl/default.nix
-index d4be8cc2428..3979698711f 100644
--- a/pkgs/development/libraries/openssl/default.nix
-+++ b/pkgs/development/libraries/openssl/default.nix
-@@ -50,9 +50,21 @@ let
-       substituteInPlace crypto/async/arch/async_posix.h \
-         --replace '!defined(__ANDROID__) && !defined(__OpenBSD__)' \
-                   '!defined(__ANDROID__) && !defined(__OpenBSD__) && 0'
-+    '' + optionalString static
-+    # On static builds, the ENGINESDIR will be empty, but its path will be
-+    # compiled into the library. In order to minimize the runtime dependencies
-+    # of packages that statically link openssl, we move it into the OPENSSLDIR,
-+    # which will be separated into the 'etc' output.
-+    ''
-+      substituteInPlace Configurations/unix-Makefile.tmpl \
-+        --replace 'ENGINESDIR=$(libdir)/engines-{- $sover_dirname -}' \
-+                  'ENGINESDIR=$(OPENSSLDIR)/engines-{- $sover_dirname -}'
-     '';
- 
-    outputs = [ "bin" "dev" "out" "man" ] ++ optional withDocs "doc";
-+    outputs = [ "bin" "dev" "out" "man" ]
-+      ++ optional withDocs "doc"
-+      # Separate output for the runtime dependencies of the static build.
-+      ++ optional static "etc";
-     setOutputFlags = false;
-     separateDebugInfo =
-       !stdenv.hostPlatform.isDarwin &&
-@@ -101,7 +113,17 @@ let
-     configureFlags = [
-       "shared" # "shared" builds both shared and static libraries
-       "--libdir=lib"
-      "--openssldir=etc/ssl"
-+      (if !static then
-+         "--openssldir=etc/ssl"
-+       else
-+         # Separate the OPENSSLDIR into its own output, as its path will be
-+         # compiled into 'libcrypto.a'. This makes it a runtime dependency of
-+         # any package that statically links openssl, so we want to keep that
-+         # output minimal. We need to prepend '/.' to the path in order to make
-+         # it appear absolute before variable expansion, the 'prefix' would be
-+         # prepended to it otherwise.
-+         "--openssldir=/.$(etc)/etc/ssl"
-+      )
-     ] ++ lib.optionals withCryptodev [
-       "-DHAVE_CRYPTODEV"
-       "-DUSE_CRYPTODEV_DIGESTS"
-@@ -131,6 +153,9 @@ let
-       if [ -n "$(echo $out/lib/*.so $out/lib/*.dylib $out/lib/*.dll)" ]; then
-           rm "$out/lib/"*.a
-       fi
-+
-+      # 'etc' is a separate output on static builds only.
-+      etc=$out
-     '' + lib.optionalString (!stdenv.hostPlatform.isWindows)
-       # Fix bin/c_rehash's perl interpreter line
-       #
-@@ -152,14 +177,15 @@ let
-       mv $out/include $dev/
- 
-       # remove dependency on Perl at runtime
-      rm -r $out/etc/ssl/misc
-+      rm -r $etc/etc/ssl/misc
- 
-      rmdir $out/etc/ssl/{certs,private}
-+      rmdir $etc/etc/ssl/{certs,private}
-     '';
- 
-     postFixup = lib.optionalString (!stdenv.hostPlatform.isWindows) ''
-      # Check to make sure the main output doesn't depend on perl
-      if grep -r '${buildPackages.perl}' $out; then
-+      # Check to make sure the main output and the static runtime dependencies
-+      # don't depend on perl
-+      if grep -r '${buildPackages.perl}' $out $etc; then
-         echo "Found an erroneous dependency on perl ^^^" >&2
-         exit 1
-       fi
@@ -0,0 +1,12 @@
+diff --git a/survey/default.nix b/survey/default.nix
+index 70afbbc..28cb0e9 100644
+--- a/survey/default.nix
+++ b/survey/default.nix
+@@ -81,6 +81,7 @@ let
+   # `.override` and the likes).
+   isProperHaskellPackage = val:
+     lib.isDerivation val && # must pass lib.isDerivation
+    val.pname != "ghc-bignum" &&
+     val ? env; # must have an .env key
+ 
+   # Function that tells us if a given Haskell package has an executable.
@@ -0,0 +1,13 @@
+diff --git a/survey/default.nix b/survey/default.nix
+index 46d8066..a47f214 100644
+--- a/survey/default.nix
+++ b/survey/default.nix
+@@ -1519,7 +1519,7 @@ let
+                   [
+                     "--enable-executable-static" # requires `useFixedCabal`
+                     # `enableShared` seems to be required to avoid `recompile with -fPIC` errors on some packages.
+-                    "--extra-lib-dirs=${final.ncurses.override { enableStatic = true; enableShared = true; }}/lib"
+                    "--extra-lib-dirs=${final.ncurses.override { enableStatic = true; }}/lib"
+                   ]
+                   # TODO Figure out why this and the below libffi are necessary.
+                   #      `working` and `workingStackageExecutables` don't seem to need that,
@@ -1,5 +1,5 @@
 # Derive a fully static Haskell package based on musl instead of glibc.
-{ nixpkgs, compiler, patches, allOverlays }:
+{ nixpkgs, system, compiler, patches, allOverlays }:

 name: src:
 let
@@ -17,14 +17,8 @@ let
    patches.applyPatches "patched-static-haskell-nix"
      static-haskell-nix
      [
-        # No patches currently required.
-      ];
-
-  patchedNixpkgs =
-    patches.applyPatches "patched-nixpkgs"
-      nixpkgs
-      [
-        patches.nixpkgs-openssl-split-runtime-dependencies-of-static-builds
+        patches.static-haskell-nix-ncurses
+        patches.static-haskell-nix-ghc-bignum
      ];

  extraOverrides =
@@ -50,13 +44,13 @@ let
      )
    ];

-  # Apply our overlay to the given pkgs.
+  # Apply our overlay to nixpkgs.
  normalPkgs =
-    import patchedNixpkgs { inherit overlays; };
+    import nixpkgs { inherit overlays system; };

  defaultCabalPackageVersionComingWithGhc =
    {
-      ghc8107 = "Cabal_3_2_1_0";
+      ghc924 = "Cabal_3_6_3_0";
    }."${compiler}";

  # The static-haskell-nix 'survey' derives a full static set of Haskell
@@ -28,6 +28,8 @@ let
      ''
        # clean old coverage data, too
        rm -rf .hpc coverage
+        # clean old hie files
+        find . -name "*.hie" -type f -delete
        exec ${cabal-install}/bin/cabal v2-clean
      '';

@@ -4,7 +4,10 @@
 , checkedShellScript
 , devCabalOptions
 , entr
+, git
+, gnugrep
 , graphviz
+, haskellPackages
 , hsie
 , nix
 , silver-searcher
@@ -29,7 +32,7 @@ let
            "ARG_POSITIONAL_SINGLE([command], [Command to run])"
            "ARG_LEFTOVERS([command arguments])"
          ];
-        addCommandCompletion = true;
+        positionalCompletion = "_command";
        redirectTixFiles = false; # will be done by sub-command
        inRootDir = true;
      }
@@ -64,23 +67,172 @@ let
        name = "postgrest-check";
        docs =
          ''
-            Run most checks that will also run on CI.
+            Run most checks that will also run on CI, but only against the
+            latest PostgreSQL version.

-            This currently excludes the memory tests, as those are particularly
-            expensive.
+            This currently excludes the memory and spec-idempotence tests,
+            as those are particularly expensive.
          '';
        inRootDir = true;
      }
      ''
-        ${withTools}/bin/postgrest-with-all ${tests}/bin/postgrest-test-spec
-        ${withTools}/bin/postgrest-with-all ${tests}/bin/postgrest-test-querycost
+        ${tests}/bin/postgrest-test-spec
+        ${tests}/bin/postgrest-test-querycost
        ${tests}/bin/postgrest-test-doctests
-        ${tests}/bin/postgrest-test-spec-idempotence
        ${tests}/bin/postgrest-test-io
        ${style}/bin/postgrest-lint
        ${style}/bin/postgrest-style-check
      '';

+  gitHooks =
+    let
+      name = "postgrest-git-hooks";
+    in
+    checkedShellScript
+      {
+        inherit name;
+        docs =
+          ''
+            Enable or disable git pre-commit and pre-push hooks.
+
+            Basic is faster and will only run:
+              - pre-commit: postgrest-style
+              - pre-push: postgrest-lint
+
+            Full takes a lot more time and will run:
+              - pre-commit: postgrest-style && postgrest-lint
+              - pre-push: postgrest-check
+
+            Changes made by postgrest-style will be staged automatically.
+
+            Example usage:
+              postgrest-git-hooks disable
+              postgrest-git-hooks enable basic
+              postgrest-git-hooks enable full
+
+            The "run" operation and "--hook" argument are only used internally.
+          '';
+        args =
+          [
+            "ARG_POSITIONAL_SINGLE([operation], [Operation])"
+            "ARG_TYPE_GROUP_SET([OPERATION], [OPERATION], [operation], [disable,enable,run])"
+            "ARG_POSITIONAL_SINGLE([mode], [Mode], [basic])"
+            "ARG_TYPE_GROUP_SET([MODE], [MODE], [mode], [basic,full])"
+            "ARG_OPTIONAL_SINGLE([hook], , [Hook], [pre-commit])"
+            "ARG_TYPE_GROUP_SET([HOOK], [HOOK], [hook], [pre-commit,pre-push])"
+          ];
+        positionalCompletion =
+          ''
+            if test "$prev" == "${name}"; then
+              COMPREPLY=( $(compgen -W "enable disable" -- "$cur") )
+            elif test "$prev" == "enable" || test "$prev" == "disable"; then
+              COMPREPLY=( $(compgen -W "basic full" -- "$cur") )
+            fi
+          '';
+        inRootDir = true;
+      }
+      ''
+        if [ run != "$_arg_operation" ]; then
+          # Remove all hooks first and ignore failures because the file might be missing.
+          # This assumes that we're only adding lines that include "postgrest-git-hooks"
+          # to the hook file.
+          sed -i -e '/postgrest-git-hooks/d' .git/hooks/pre-{commit,push} 2> /dev/null || true
+
+          if [ disable != "$_arg_operation" ]; then
+            # The nix-shell && + nix-shell || pattern makes sure we can run the hook
+            # in a pure nix-shell, where nix-shell itself is not available, too.
+
+            # The $(nix-shell --run "command -v ...") pattern ensures we only need to enable
+            # the hooks once and still run the latest of our hook scripts, even when we
+            # update them in the repo.
+
+            echo 'command -v nix-shell > /dev/null || postgrest-git-hooks --hook=pre-commit run' "$_arg_mode" \
+              >> .git/hooks/pre-commit
+            # shellcheck disable=SC2016
+            echo 'command -v nix-shell > /dev/null && $(nix-shell --quiet -Q --run "command -v postgrest-git-hooks") --hook=pre-commit run' "$_arg_mode" \
+             >> .git/hooks/pre-commit
+            chmod +x .git/hooks/pre-commit
+
+            echo 'command -v nix-shell > /dev/null || postgrest-git-hooks --hook=pre-push run' "$_arg_mode" \
+              >> .git/hooks/pre-push
+            # shellcheck disable=SC2016
+            echo 'command -v nix-shell > /dev/null && $(nix-shell --quiet -Q --run "command -v postgrest-git-hooks") --hook=pre-push run' "$_arg_mode" \
+             >> .git/hooks/pre-push
+            chmod +x .git/hooks/pre-push
+          fi
+        else
+          # When run from a git hook, the GIT_ environment variables conflict with our withGit helper.
+          # The following unsets all GIT_ variables.
+          unset "''${!GIT_@}"
+
+          function restore () {
+            ref="$(git stash list --format=format:%gD --grep "$1" -n1)"
+            # this will avoid merge conflicts when applying the stash
+            ${git}/bin/git restore --source="$ref" .
+            # restore untracked files, too. could fail with no files
+            if [ "$(git show --numstat --format=oneline "$ref^3" | wc -l)" -gt 1 ]; then
+              ${git}/bin/git restore --overlay --source="$ref^3" .
+            fi
+            ${git}/bin/git stash drop "$ref"
+          }
+
+          case "$_arg_mode" in
+            basic)
+              case "$_arg_hook" in
+                pre-commit)
+                  # To be able to automatically add only changes from postgrest-style to the staging area,
+                  # we need to run postgrest-style twice. Otherwise we'd risk merge conflicts when popping
+                  # the stash afterwards.
+                  ${style}/bin/postgrest-style
+
+                  stash="postgrest-git-hooks-$RANDOM"
+                  ${git}/bin/git stash push --include-untracked --keep-index -m "$stash"
+                  if [ "$(git stash list --grep $stash)" ]; then
+                    # Only create the stash pop trap, if we actually created a stash.
+                    # Otherwise stash pop will cause havoc.
+                    trap 'restore "$stash"' EXIT
+                  fi
+
+                  ${style}/bin/postgrest-style
+                  ${git}/bin/git add .
+                  ;;
+                pre-push)
+                  # Create a clean working tree without any uncomitted changes.
+                  ${withTools.withGit} HEAD ${style}/bin/postgrest-lint
+                  ;;
+              esac
+              ;;
+            full)
+              case "$_arg_hook" in
+                pre-commit)
+                  # To be able to automatically add only changes from postgrest-style to the staging area,
+                  # we need to run postgrest-style twice. Otherwise we'd risk merge conflicts when popping
+                  # the stash afterwards.
+                  ${style}/bin/postgrest-style
+
+                  stash="postgrest-git-hooks-$RANDOM"
+                  ${git}/bin/git stash push --include-untracked --keep-index -m "$stash"
+                  if [ "$(git stash list --grep $stash)" ]; then
+                    # Only create the stash pop trap, if we actually created a stash.
+                    # Otherwise stash pop will cause havoc.
+                    trap 'restore "$stash"' EXIT
+                  fi
+
+                  ${style}/bin/postgrest-style
+                  ${git}/bin/git add .
+
+                  ${style}/bin/postgrest-lint
+                  ;;
+                pre-push)
+                  # Create a clean working tree without any uncomitted changes.
+                  ${withTools.withGit} HEAD ${check}
+                  ;;
+              esac
+              ;;
+          esac
+        fi
+      '';
+
  dumpMinimalImports =
    checkedShellScript
      {
@@ -146,6 +298,7 @@ buildToolbox
    watch
    pushCachix
    check
+    gitHooks
    dumpMinimalImports
    hsieMinimalImports
    hsieGraphModules
@@ -0,0 +1,178 @@
+{ buildToolbox
+, checkedShellScript
+, jq
+, python3Packages
+, vegeta
+, withTools
+, writers
+}:
+let
+  runner =
+    checkedShellScript
+      {
+        name = "postgrest-loadtest-runner";
+        docs = "Run vegeta. Assume PostgREST to be running.";
+        args = [
+          "ARG_LEFTOVERS([additional vegeta arguments])"
+          "ARG_USE_ENV([PGRST_SERVER_UNIX_SOCKET], [], [Unix socket to connect to running PostgREST instance])"
+        ];
+      }
+      ''
+        # ARG_USE_ENV only adds defaults or docs for environment variables
+        # We manually implement a required check here
+        # See also: https://github.com/matejak/argbash/issues/80
+        : "''${PGRST_SERVER_UNIX_SOCKET:?PGRST_SERVER_UNIX_SOCKET is required}"
+
+        ${vegeta}/bin/vegeta -cpus 1 attack \
+                                     -unix-socket "$PGRST_SERVER_UNIX_SOCKET" \
+                                     -max-workers 1 \
+                                     -workers 1 \
+                                     -rate 0 \
+                                     -duration 60s \
+                                     "''${_arg_leftovers[@]}"
+      '';
+
+  loadtest =
+    checkedShellScript
+      {
+        name = "postgrest-loadtest";
+        docs = "Run the vegeta loadtests with PostgREST.";
+        args = [
+          "ARG_OPTIONAL_SINGLE([output], [o], [Filename to dump json output to], [./loadtest/result.bin])"
+          "ARG_OPTIONAL_SINGLE([testdir], [t], [Directory to load tests and fixtures from], [./test/load])"
+          "ARG_LEFTOVERS([additional vegeta arguments])"
+        ];
+        inRootDir = true;
+      }
+      ''
+        # previously required settings to make this work with older branches
+        export PGRST_DB_ANON_ROLE="postgrest_test_anonymous"
+        export PGRST_DB_URI="postgresql://"
+        export PGRST_DB_SCHEMAS="test"
+
+        export PGRST_DB_CONFIG="false"
+        export PGRST_DB_POOL="1"
+        export PGRST_DB_TX_END="rollback-allow-override"
+        export PGRST_LOG_LEVEL="crit"
+
+        mkdir -p "$(dirname "$_arg_output")"
+
+        # shellcheck disable=SC2145
+        ${withTools.withPg} --fixtures "$_arg_testdir"/fixtures.sql \
+        ${withTools.withPgrst} \
+        sh -c "cd \"$_arg_testdir\" && ${runner} -targets targets.http -output \"$_arg_output\" \"''${_arg_leftovers[@]}\""
+        ${vegeta}/bin/vegeta report -type=text "$_arg_output"
+      '';
+
+  loadtestAgainst =
+    let
+      name = "postgrest-loadtest-against";
+    in
+    checkedShellScript
+      {
+        inherit name;
+        docs =
+          ''
+            Run the vegeta loadtest twice:
+            - once on the <target> branch
+            - once in the current worktree
+          '';
+        args = [
+          "ARG_POSITIONAL_SINGLE([target], [Commit-ish reference to compare with])"
+          "ARG_LEFTOVERS([additional vegeta arguments])"
+        ];
+        positionalCompletion =
+          ''
+            if test "$prev" == "${name}"; then
+              __gitcomp_nl "$(__git_refs)"
+            fi
+          '';
+        inRootDir = true;
+      }
+      ''
+        cat << EOF
+
+        Running loadtest on "$_arg_target"...
+
+        EOF
+
+        # Runs the test files from the current working tree
+        # to make sure both tests are run with the same files.
+        # Save the results in the current working tree, too,
+        # otherwise they'd be lost in the temporary working tree
+        # created by withTools.withGit.
+        ${withTools.withGit} "$_arg_target" ${loadtest} --output "$PWD/loadtest/$_arg_target.bin" --testdir "$PWD/test/load" "''${_arg_leftovers[@]}"
+
+        cat << EOF
+
+        Done running on "$_arg_target".
+
+        EOF
+
+        cat << EOF
+
+        Running loadtest on HEAD...
+
+        EOF
+
+        ${loadtest} --output "$PWD/loadtest/head.bin" --testdir "$PWD/test/load" "''${_arg_leftovers[@]}"
+
+        cat << EOF
+
+        Done running on HEAD.
+
+        EOF
+      '';
+
+  reporter =
+    checkedShellScript
+      {
+        name = "postgrest-loadtest-reporter";
+        docs = "Create a named json report for a single result file.";
+        args = [
+          "ARG_POSITIONAL_SINGLE([file], [Filename of result to create report for])"
+          "ARG_LEFTOVERS([additional vegeta arguments])"
+        ];
+        inRootDir = true;
+      }
+      ''
+        ${vegeta}/bin/vegeta report -type=json "$_arg_file" \
+          | ${jq}/bin/jq --arg branch "$(basename "$_arg_file" .bin)" '. + {branch: $branch}'
+      '';
+
+  toMarkdown =
+    writers.writePython3 "postgrest-loadtest-to-markdown"
+      {
+        libraries = [ python3Packages.pandas python3Packages.tabulate ];
+      }
+      ''
+        import sys
+        import pandas as pd
+
+        pd.read_json(sys.stdin) \
+          .set_index('param') \
+          .drop(['branch', 'earliest', 'end', 'latest']) \
+          .convert_dtypes() \
+          .to_markdown(sys.stdout, floatfmt='.0f')
+      '';
+
+
+  report =
+    checkedShellScript
+      {
+        name = "postgrest-loadtest-report";
+        docs = "Create a report of all loadtest reports as markdown.";
+        inRootDir = true;
+      }
+      ''
+        find loadtest -type f -iname '*.bin' -exec ${reporter} {} \; \
+          | ${jq}/bin/jq '[leaf_paths as $path | {param: $path | join("."), (.branch): getpath($path)}]' \
+          | ${jq}/bin/jq --slurp 'flatten | group_by(.param) | map(add)' \
+          | ${toMarkdown}
+      '';
+
+in
+buildToolbox {
+  name = "postgrest-loadtest";
+  tools = [ loadtest loadtestAgainst report ];
+}
@@ -17,7 +17,7 @@ let
        withPath = [ postgrestProfiled curl ];
      }
      ''
-        ${withTools.latest} test/memory-tests.sh
+        ${withTools.withPg} test/memory/memory-tests.sh
      '';

 in
@@ -46,9 +46,82 @@ let
          --data-urlencode description@${description} \
          --data-urlencode full_description@${fullDescription}
      '';
+
+  release =
+    checkedShellScript
+      {
+        name = "postgrest-release";
+        docs = "Patch postgrest.cabal, tag and push all in one go.";
+        args = [ "ARG_POSITIONAL_SINGLE([version], [Version to release], [pre])" ];
+        inRootDir = true;
+      }
+      ''
+        trap "echo You need to be on the main branch to proceed. Exiting ..." ERR
+        [ "$(git rev-parse --abbrev-ref HEAD)" == "main" ]
+        trap "" ERR
+
+        trap "echo You have uncommitted changes in postgrest.cabal. Exiting ..." ERR
+        git diff --exit-code HEAD postgrest.cabal > /dev/null
+        trap "" ERR
+
+        current_version="$(grep -oP '^version:\s*\K.*' postgrest.cabal)"
+        # shellcheck disable=SC2034
+        IFS=. read -r major minor patch pre <<< "$current_version"
+        echo "Current version is $current_version"
+
+        bump_pre="$major.$minor.$patch.$(date '+%Y%m%d')"
+        bump_patch="$major.$minor.$((patch+1))"
+        bump_minor="$major.$((minor+1)).0"
+        bump_major="$((major+1)).0.0"
+
+        PS3="Please select the new version: "
+        select new_version in "$bump_pre" "$bump_patch" "$bump_minor" "$bump_major"; do
+          case "$REPLY" in
+            1|2|3|4)
+              echo "Selected $new_version"
+              break
+              ;;
+            *)
+            echo "Invalid option $REPLY"
+            ;;
+          esac
+        done
+
+        echo "Updating postgrest.cabal ..."
+        sed -i -E "s/^(version:\s+).*$/\1$new_version/" postgrest.cabal > /dev/null
+
+        echo "Committing ..."
+        git add postgrest.cabal > /dev/null
+        git commit -m "bump version to $new_version" > /dev/null
+
+        echo "Tagging ..."
+        git tag "v$new_version" > /dev/null
+
+        trap "Couldn't find remote. Please push manually ..." ERR
+        remote="$(git remote -v | grep PostgREST/postgrest | grep push | cut -f1)"
+        trap "" ERR
+
+        push="git push --atomic $remote main v$new_version"
+
+        echo "To push both the branch and the new tag, the following will be run:"
+        echo
+        echo "$push"
+        echo
+        
+        read -r -p 'Proceed? (y/N) ' REPLY
+        case "$REPLY" in 
+          y|Y)
+            $push
+            ;;
+          *)
+            echo "Aborting ..."
+            ;;
+        esac
+      '';
+
 in
 buildToolbox
 {
  name = "postgrest-release";
-  tools = [ dockerHubDescription ];
+  tools = [ dockerHubDescription release ];
 }
@@ -55,7 +55,7 @@ write from scratch.
 # Usage

 To learn how to use this container, see the [PostgREST Docker
-documentation](https://postgrest.com/en/stable/install.html#docker).
+documentation](https://postgrest.org/en/stable/install.html#docker).

 You can configure the PostgREST image by setting
 [enviroment variables](https://postgrest.org/en/stable/configuration.html).
@@ -66,5 +66,5 @@ The image is built from scratch using
 [Nix](https://nixos.org/nixpkgs/manual/#sec-pkgs-dockerTools) instead of a
 `Dockerfile`, which yields a higly secure and optimized image. This is also why
 no commands are listed in the image history. See the [PostgREST
-respository](https://github.com/PostgREST/postgrest/tree/main/nix/docker) for
+respository](https://github.com/PostgREST/postgrest/tree/main/nix/tools/docker) for
 details on the build process and how to inspect the image.
@@ -44,7 +44,9 @@ let
      ''
        ${style}

-        ${git}/bin/git diff-index --exit-code HEAD -- '*.hs' '*.lhs' '*.nix'
+        trap "echo postgrest-style-check failed. Run postgrest-style to fix issues automatically." ERR
+
+        ${git}/bin/git diff-index --exit-code HEAD -- '*.hs' '*.lhs' '*.nix' '*.py'
      '';

  lint =
@@ -67,8 +69,7 @@ let
        echo "Linting bash scripts..."
        ${shellcheck}/bin/shellcheck \
          .github/get_cirrusci_freebsd \
-          .github/release \
-          test/with_tmp_db
+          .github/release

        echo "Linting workflows..."
        ${actionlint}/bin/actionlint
@@ -3,14 +3,17 @@
 , checkedShellScript
 , devCabalOptions
 , ghc
-, glibcLocales
+, glibcLocales ? null
 , gnugrep
-, haskell
 , hpc-codecov
+, hostPlatform
 , jq
+, lib
 , postgrest
 , python3
 , runtimeShell
+, stdenv
+, weeder
 , withTools
 , yq
 }:
@@ -19,12 +22,14 @@ let
    checkedShellScript
      {
        name = "postgrest-test-spec";
-        docs = "Run the Haskell test suite";
+        docs = "Run the Haskell test suite. Use --match PATTERN for running individual specs";
+        args = [ "ARG_LEFTOVERS([hspec arguments])" ];
        inRootDir = true;
        withEnv = postgrest.env;
      }
      ''
-        ${withTools.latest} ${cabal-install}/bin/cabal v2-run ${devCabalOptions} test:spec
+        ${withTools.withPg} ${cabal-install}/bin/cabal v2-run ${devCabalOptions} \
+          test:spec -- "''${_arg_leftovers[@]}"
      '';

  testQuerycost =
@@ -36,7 +41,7 @@ let
        withEnv = postgrest.env;
      }
      ''
-        ${withTools.latest} ${cabal-install}/bin/cabal v2-run ${devCabalOptions} test:querycost
+        ${withTools.withPg} ${cabal-install}/bin/cabal v2-run ${devCabalOptions} test:querycost
      '';

  testDoctests =
@@ -66,7 +71,7 @@ let
        withEnv = postgrest.env;
      }
      ''
-        ${withTools.latest} ${runtimeShell} -c " \
+        ${withTools.withPg} ${runtimeShell} -c " \
          ${cabal-install}/bin/cabal v2-run ${devCabalOptions} test:spec && \
          ${cabal-install}/bin/cabal v2-run ${devCabalOptions} test:spec"
      '';
@@ -85,15 +90,15 @@ let
    checkedShellScript
      {
        name = "postgrest-test-io";
-        docs = "Run the pytest-based IO tests.";
+        docs = "Run the pytest-based IO tests. Add -k to run tests that match a given expression.";
        args = [ "ARG_LEFTOVERS([pytest arguments])" ];
        inRootDir = true;
        withEnv = postgrest.env;
      }
      ''
        ${cabal-install}/bin/cabal v2-build ${devCabalOptions}
-        ${cabal-install}/bin/cabal v2-exec ${withTools.latest} \
-          ${ioTestPython}/bin/pytest -- -v test/io-tests "''${_arg_leftovers[@]}"
+        ${cabal-install}/bin/cabal v2-exec -- ${withTools.withPg} -f test/io/fixtures.sql \
+          ${ioTestPython}/bin/pytest -v test/io "''${_arg_leftovers[@]}"
      '';

  dumpSchema =
@@ -106,7 +111,7 @@ let
        withPath = [ jq ];
      }
      ''
-        ${withTools.latest} \
+        ${withTools.withPg} \
            ${cabal-install}/bin/cabal v2-run ${devCabalOptions} --verbose=0 -- \
            postgrest --dump-schema \
            | ${yq}/bin/yq -y .
@@ -116,69 +121,79 @@ let
    checkedShellScript
      {
        name = "postgrest-coverage";
-        docs = "Run spec and io tests while collecting hpc coverage data.";
+        docs = "Run spec and io tests while collecting hpc coverage data. First runs weeder to detect dead code.";
        args = [ "ARG_LEFTOVERS([hpc report arguments])" ];
        inRootDir = true;
        redirectTixFiles = false;
        withEnv = postgrest.env;
        withTmpDir = true;
      }
-      ''
-        export LOCALE_ARCHIVE="${glibcLocales}/lib/locale/locale-archive"
+      (
+        # required for `hpc markup` in CI; glibcLocales is not available e.g. on Darwin
+        lib.optionalString (stdenv.isLinux && hostPlatform.libc == "glibc") ''
+          export LOCALE_ARCHIVE="${glibcLocales}/lib/locale/locale-archive"
+        '' +

-        # clean up previous coverage reports
-        mkdir -p coverage
-        rm -rf coverage/*
+        ''
+          # clean up previous coverage reports
+          mkdir -p coverage
+          rm -rf coverage/*

-        # build once before running all the tests
-        ${cabal-install}/bin/cabal v2-build ${devCabalOptions} exe:postgrest lib:postgrest test:spec test:querycost
+          # build once before running all the tests
+          ${cabal-install}/bin/cabal v2-build ${devCabalOptions} exe:postgrest lib:postgrest test:spec test:querycost

-        # collect all tests
-        HPCTIXFILE="$tmpdir"/io.tix \
-          ${withTools.latest} ${cabal-install}/bin/cabal v2-exec ${devCabalOptions} \
-          ${ioTestPython}/bin/pytest -- -v test/io-tests
-          
-        HPCTIXFILE="$tmpdir"/spec.tix \
-          ${withTools.latest} ${cabal-install}/bin/cabal v2-run ${devCabalOptions} test:spec
+          (
+            trap 'echo Found dead code: Check file list above.' ERR ;
+            ${weeder}/bin/weeder --config=./test/weeder.dhall
+          )

-        HPCTIXFILE="$tmpdir"/querycost.tix \
-          ${withTools.latest} ${cabal-install}/bin/cabal v2-run ${devCabalOptions} test:querycost
+          # collect all tests
+          HPCTIXFILE="$tmpdir"/io.tix \
+            ${withTools.withPg} -f test/io/fixtures.sql ${cabal-install}/bin/cabal v2-exec ${devCabalOptions} -- \
+            ${ioTestPython}/bin/pytest -v test/io

-        # Note: No coverage for doctests, as doctests leverage GHCi and GHCi does not support hpc
+          HPCTIXFILE="$tmpdir"/spec.tix \
+            ${withTools.withPg} ${cabal-install}/bin/cabal v2-run ${devCabalOptions} test:spec

-        # collect all the tix files
-        ${ghc}/bin/hpc sum  --union --exclude=Paths_postgrest --output="$tmpdir"/tests.tix \
-          "$tmpdir"/io*.tix "$tmpdir"/spec.tix "$tmpdir"/querycost.tix
+          HPCTIXFILE="$tmpdir"/querycost.tix \
+            ${withTools.withPg} ${cabal-install}/bin/cabal v2-run ${devCabalOptions} test:querycost

-        # prepare the overlay
-        ${ghc}/bin/hpc overlay --output="$tmpdir"/overlay.tix test/coverage.overlay
-        ${ghc}/bin/hpc sum --union --output="$tmpdir"/tests-overlay.tix "$tmpdir"/tests.tix "$tmpdir"/overlay.tix
+          # Note: No coverage for doctests, as doctests leverage GHCi and GHCi does not support hpc

-        # check nothing in the overlay is actually tested
-        ${ghc}/bin/hpc map --function=inv --output="$tmpdir"/inverted.tix "$tmpdir"/tests.tix
-        ${ghc}/bin/hpc combine --function=sub \
-          --output="$tmpdir"/check.tix "$tmpdir"/overlay.tix "$tmpdir"/inverted.tix
-        # returns zero exit code if any count="<non-zero>" lines are found, i.e.
-        # something is covered by both the overlay and the tests
-        if ${ghc}/bin/hpc report --xml "$tmpdir"/check.tix | ${gnugrep}/bin/grep -qP 'count="[^0]'
-        then
-          ${ghc}/bin/hpc markup --highlight-covered --destdir=coverage/overlay "$tmpdir"/overlay.tix || true
-          ${ghc}/bin/hpc markup --highlight-covered --destdir=coverage/check "$tmpdir"/check.tix || true
-          echo "ERROR: Something is covered by both the tests and the overlay:"
-          echo "file://$(pwd)/coverage/check/hpc_index.html"
-          exit 1
-        else
-          # copy the result .tix file to the coverage/ dir to make it available to postgrest-coverage-draft-overlay, too
-          cp "$tmpdir"/tests-overlay.tix coverage/postgrest.tix
-          # prepare codecov json report
-          ${hpc-codecov}/bin/hpc-codecov --mix=.hpc --out=coverage/codecov.json coverage/postgrest.tix
+          # collect all the tix files
+          ${ghc}/bin/hpc sum  --union --exclude=Paths_postgrest --output="$tmpdir"/tests.tix \
+            "$tmpdir"/io*.tix "$tmpdir"/spec.tix "$tmpdir"/querycost.tix

-          # create html and stdout reports
-          ${ghc}/bin/hpc markup --destdir=coverage coverage/postgrest.tix
-          echo "file://$(pwd)/coverage/hpc_index.html"
-          ${ghc}/bin/hpc report coverage/postgrest.tix "''${_arg_leftovers[@]}"
-        fi
-      '';
+          # prepare the overlay
+          ${ghc}/bin/hpc overlay --output="$tmpdir"/overlay.tix test/coverage.overlay
+          ${ghc}/bin/hpc sum --union --output="$tmpdir"/tests-overlay.tix "$tmpdir"/tests.tix "$tmpdir"/overlay.tix
+
+          # check nothing in the overlay is actually tested
+          ${ghc}/bin/hpc map --function=inv --output="$tmpdir"/inverted.tix "$tmpdir"/tests.tix
+          ${ghc}/bin/hpc combine --function=sub \
+            --output="$tmpdir"/check.tix "$tmpdir"/overlay.tix "$tmpdir"/inverted.tix
+          # returns zero exit code if any count="<non-zero>" lines are found, i.e.
+          # something is covered by both the overlay and the tests
+          if ${ghc}/bin/hpc report --xml "$tmpdir"/check.tix | ${gnugrep}/bin/grep -qP 'count="[^0]'
+          then
+            ${ghc}/bin/hpc markup --highlight-covered --destdir=coverage/overlay "$tmpdir"/overlay.tix || true
+            ${ghc}/bin/hpc markup --highlight-covered --destdir=coverage/check "$tmpdir"/check.tix || true
+            echo "ERROR: Something is covered by both the tests and the overlay:"
+            echo "file://$(pwd)/coverage/check/hpc_index.html"
+            exit 1
+          else
+            # copy the result .tix file to the coverage/ dir to make it available to postgrest-coverage-draft-overlay, too
+            cp "$tmpdir"/tests-overlay.tix coverage/postgrest.tix
+            # prepare codecov json report
+            ${hpc-codecov}/bin/hpc-codecov --mix=.hpc --out=coverage/codecov.json coverage/postgrest.tix
+
+            # create html and stdout reports
+            ${ghc}/bin/hpc markup --destdir=coverage coverage/postgrest.tix
+            echo "file://$(pwd)/coverage/hpc_index.html"
+            ${ghc}/bin/hpc report coverage/postgrest.tix "''${_arg_leftovers[@]}"
+          fi
+        ''
+      );

  coverageDraftOverlay =
    checkedShellScript
@@ -192,6 +207,26 @@ let
        sed -i 's|^module \(.*\):|module \1/|g' test/coverage.overlay
      '';

+  checkStatic =
+    checkedShellScript
+      {
+        name = "postgrest-check-static";
+        docs = "Verify that the argument is a static executable.";
+        args = [ "ARG_POSITIONAL_SINGLE([executable], [Executable])" ];
+        inRootDir = true;
+        withEnv = postgrest.env;
+      }
+      ''
+        exe="$_arg_executable"
+        ldd_output=$(ldd "$exe" 2>&1 || true)
+        if ! grep -q "not a dynamic executable" <<< "$ldd_output"; then
+          echo "not a static executable, ldd output:"
+          echo "$ldd_output"
+          exit 1
+        fi
+        "$exe" --help
+      '';
+
 in
 buildToolbox
 {
@@ -206,5 +241,6 @@ buildToolbox
      dumpSchema
      coverage
      coverageDraftOverlay
+      checkStatic
    ];
 }
@@ -1,9 +1,14 @@
-{ bashCompletion
+{ bash-completion
 , buildToolbox
+, cabal-install
 , checkedShellScript
+, curl
+, devCabalOptions
+, git
 , lib
 , postgresqlVersions
-, writeTextFile
+, postgrest
+, writeText
 }:
 let
  withTmpDb =
@@ -14,15 +19,14 @@ let
        docs = "Run the given command in a temporary database with ${name}";
        args =
          [
-            "ARG_OPTIONAL_SINGLE([fixtures], [f], [SQL file to load fixtures from], [test/fixtures/load.sql])"
+            "ARG_OPTIONAL_SINGLE([fixtures], [f], [SQL file to load fixtures from], [test/spec/fixtures/load.sql])"
            "ARG_POSITIONAL_SINGLE([command], [Command to run])"
            "ARG_LEFTOVERS([command arguments])"
            "ARG_USE_ENV([PGUSER], [postgrest_test_authenticator], [Authenticator PG role])"
            "ARG_USE_ENV([PGDATABASE], [postgres], [PG database name])"
            "ARG_USE_ENV([PGRST_DB_SCHEMAS], [test], [Schema to expose])"
-            "ARG_USE_ENV([PGRST_DB_ANON_ROLE], [postgrest_test_anonymous], [Anonymous PG role])"
          ];
-        addCommandCompletion = true;
+        positionalCompletion = "_command";
        inRootDir = true;
        redirectTixFiles = false;
        withPath = [ postgresql ];
@@ -30,8 +34,8 @@ let
      }
      ''
        # avoid starting multiple layers of withTmpDb
-        if test -v PGRST_DB_URI; then
-          exec "$@"
+        if test -v PGHOST; then
+          exec "$_arg_command" "''${_arg_leftovers[@]}"
        fi

        setuplog="$tmpdir/setup.log"
@@ -48,9 +52,7 @@ let
        export PGHOST="$tmpdir/socket"
        export PGUSER
        export PGDATABASE
-        export PGRST_DB_URI="postgresql:///$PGDATABASE?host=$PGHOST&user=$PGUSER"
        export PGRST_DB_SCHEMAS
-        export PGRST_DB_ANON_ROLE

        log "Initializing database cluster..."
        # We try to make the database cluster as independent as possible from the host
@@ -60,7 +62,7 @@ let

        log "Starting the database cluster..."
        # Instead of listening on a local port, we will listen on a unix domain socket.
-        pg_ctl -l "$tmpdir/db.log" -w start -o "-F -c listen_addresses=\"\" -k $PGHOST" \
+        pg_ctl -l "$tmpdir/db.log" -w start -o "-F -c listen_addresses=\"\" -k $PGHOST -c log_statement=\"all\"" \
          >> "$setuplog"

        stop () {
@@ -78,27 +80,27 @@ let
      '';

  # Helper script for running a command against all PostgreSQL versions.
-  withAll =
+  withPgAll =
    let
      runners =
        builtins.map
-          (pg:
+          (version:
            ''
              cat << EOF

-              Running against ${pg.name}...
+              Running against ${version.name}...

              EOF

-              trap 'echo "Failed on ${pg.name}"' exit
+              trap 'echo "Failed on ${version.name}"' exit

-              (${withTmpDb pg} "$_arg_command" "''${_arg_leftovers[@]}")
+              (${withTmpDb version} "$_arg_command" "''${_arg_leftovers[@]}")

              trap "" exit

              cat << EOF

-              Done running against ${pg.name}.
+              Done running against ${version.name}.

              EOF
            '')
@@ -113,21 +115,167 @@ let
            "ARG_POSITIONAL_SINGLE([command], [Command to run])"
            "ARG_LEFTOVERS([command arguments])"
          ];
-        addCommandCompletion = true;
+        positionalCompletion = "_command";
        inRootDir = true;
      }
      (lib.concatStringsSep "\n\n" runners);

  # Create a `postgrest-with-postgresql-` for each PostgreSQL version
-  withVersions = builtins.map withTmpDb postgresqlVersions;
+  withPgVersions = builtins.map withTmpDb postgresqlVersions;
+
+  withPg = builtins.head withPgVersions;
+
+  withGit =
+    let
+      name = "postgrest-with-git";
+    in
+    checkedShellScript
+      {
+        inherit name;
+        docs =
+          ''
+            Create a new worktree of the postgrest repo in a temporary directory and
+            check out <commit>, then run <command> with arguments inside the temporary folder.
+          '';
+        args =
+          [
+            "ARG_POSITIONAL_SINGLE([commit], [Commit-ish reference to run command with])"
+            "ARG_POSITIONAL_SINGLE([command], [Command to run])"
+            "ARG_LEFTOVERS([command arguments])"
+          ];
+        positionalCompletion =
+          ''
+            if test "$prev" == "${name}"; then
+              __gitcomp_nl "$(__git_refs)"
+            else
+              _command_offset 2
+            fi
+          '';
+        inRootDir = true;
+      }
+      ''
+        # not using withTmpDir here, because we don't want to keep the directory on error
+        tmpdir="$(mktemp -d)"
+        trap 'rm -rf "$tmpdir"' EXIT
+
+        ${git}/bin/git worktree add -f "$tmpdir" "$_arg_commit" > /dev/null
+
+        cd "$tmpdir"
+        ("$_arg_command" "''${_arg_leftovers[@]}")
+
+        ${git}/bin/git worktree remove -f "$tmpdir" > /dev/null
+      '';
+
+  legacyConfig =
+    writeText "legacy.conf"
+      ''
+        # Using this config file to support older postgrest versions for `postgrest-loadtest-against`
+        db-uri="$(PGRST_DB_URI)"
+        db-schema="$(PGRST_DB_SCHEMAS)"
+        db-anon-role="$(PGRST_DB_ANON_ROLE)"
+        db-pool="$(PGRST_DB_POOL)"
+        server-unix-socket="$(PGRST_SERVER_UNIX_SOCKET)"
+        log-level="$(PGRST_LOG_LEVEL)"
+      '';
+
+  waitForPgrstPid =
+    checkedShellScript
+      {
+        name = "postgrest-wait-for-pgrst-pid";
+        docs = "Wait for PostgREST to be running. Needs to be a separate command for timeout to work below.";
+        args = [
+          "ARG_USE_ENV([PGRST_SERVER_UNIX_SOCKET], [], [Unix socket to check for running PostgREST instance])"
+        ];
+      }
+      ''
+        # ARG_USE_ENV only adds defaults or docs for environment variables
+        # We manually implement a required check here
+        # See also: https://github.com/matejak/argbash/issues/80
+        : "''${PGRST_SERVER_UNIX_SOCKET:?PGRST_SERVER_UNIX_SOCKET is required}"
+
+        until [ -S "$PGRST_SERVER_UNIX_SOCKET" ]
+        do
+          sleep 0.1
+        done
+
+        # return pid of postgrest process
+        lsof -t -c '/^postgrest$/' "$PGRST_SERVER_UNIX_SOCKET"
+      '';
+
+  waitForPgrstReady =
+    checkedShellScript
+      {
+        name = "postgrest-wait-for-pgrst-ready";
+        docs = "Wait for PostgREST to be ready to serve requests. Needs to be a separate command for timeout to work below.";
+        args = [
+          "ARG_USE_ENV([PGRST_SERVER_UNIX_SOCKET], [], [Unix socket to check for running PostgREST instance])"
+        ];
+      }
+      ''
+        # ARG_USE_ENV only adds defaults or docs for environment variables
+        # We manually implement a required check here
+        # See also: https://github.com/matejak/argbash/issues/80
+        : "''${PGRST_SERVER_UNIX_SOCKET:?PGRST_SERVER_UNIX_SOCKET is required}"
+
+        function check_status () {
+          ${curl}/bin/curl -s -o /dev/null -w "%{http_code}" --unix-socket "$PGRST_SERVER_UNIX_SOCKET" http://localhost/
+        }
+
+        while [[ "$(check_status)" != "200" ]];
+           do sleep 0.1;
+        done
+      '';
+
+  withPgrst =
+    checkedShellScript
+      {
+        name = "postgrest-with-pgrst";
+        docs = "Build and run PostgREST and run <command> with PGRST_SERVER_UNIX_SOCKET set.";
+        args =
+          [
+            "ARG_POSITIONAL_SINGLE([command], [Command to run])"
+            "ARG_LEFTOVERS([command arguments])"
+          ];
+        positionalCompletion = "_command";
+        inRootDir = true;
+        withEnv = postgrest.env;
+        withTmpDir = true;
+      }
+      ''
+        export PGRST_SERVER_UNIX_SOCKET="$tmpdir"/postgrest.socket
+
+        rm -f result
+        echo -n "Building postgrest... "
+        nix-build -A postgrestPackage > "$tmpdir"/build.log 2>&1 || {
+          echo "failed, output:"
+          cat "$tmpdir"/build.log
+          exit 1
+        }
+        echo "done."
+
+        echo -n "Starting postgrest... "
+        ./result/bin/postgrest ${legacyConfig} > "$tmpdir"/run.log 2>&1 &
+        pid=$!
+        cleanup() {
+          kill "$pid" || true
+        }
+        trap cleanup EXIT
+
+        timeout -s TERM 5 ${waitForPgrstReady} || {
+          echo "timed out, output:"
+          cat "$tmpdir"/run.log
+          exit 1
+        }
+        echo "done."
+
+        ("$_arg_command" "''${_arg_leftovers[@]}")
+      '';

 in
 buildToolbox
 {
  name = "postgrest-with";
-  tools = [ withAll ] ++ withVersions;
-  extra = {
-    # make withTools.latest available for other nix files
-    latest = withTmpDb (builtins.head postgresqlVersions);
-  };
+  tools = [ withPgAll withGit withPgrst ] ++ withPgVersions;
+  # make withTools available for other nix files
+  extra = { inherit withGit withPg withPgAll withPgrst; };
 }
@@ -1,8 +1,8 @@
 name:               postgrest
-version:            9.0.0
+version:            10.0.0
 synopsis:           REST API for any Postgres database
 description:        Reads the schema of a PostgreSQL database and creates RESTful routes
-                    for the tables and views, supporting all HTTP verbs that security
+                    for tables, views, and functions, supporting all HTTP methods that security
                    permits.
 license:            MIT
 license-file:       LICENSE
@@ -35,6 +35,7 @@ library
                      NoImplicitPrelude
  hs-source-dirs:     src
  exposed-modules:    PostgREST.App
+                      PostgREST.Admin
                      PostgREST.AppState
                      PostgREST.Auth
                      PostgREST.CLI
@@ -43,7 +44,7 @@ library
                      PostgREST.Config.JSPath
                      PostgREST.Config.PgVersion
                      PostgREST.Config.Proxy
-                      PostgREST.ContentType
+                      PostgREST.Cors
                      PostgREST.DbStructure
                      PostgREST.DbStructure.Identifiers
                      PostgREST.DbStructure.Proc
@@ -51,7 +52,9 @@ library
                      PostgREST.DbStructure.Table
                      PostgREST.Error
                      PostgREST.GucHeader
+                      PostgREST.Logger
                      PostgREST.Middleware
+                      PostgREST.MediaType
                      PostgREST.OpenAPI
                      PostgREST.Query.QueryBuilder
                      PostgREST.Query.SqlFragment
@@ -59,32 +62,31 @@ library
                      PostgREST.RangeQuery
                      PostgREST.Request.ApiRequest
                      PostgREST.Request.DbRequestBuilder
-                      PostgREST.Request.Parsers
+                      PostgREST.Request.MutateQuery
                      PostgREST.Request.Preferences
+                      PostgREST.Request.QueryParams
+                      PostgREST.Request.ReadQuery
                      PostgREST.Request.Types
                      PostgREST.Version
                      PostgREST.Workers
  other-modules:      Paths_postgrest
-  build-depends:      base                      >= 4.9 && < 4.16
+  build-depends:      base                      >= 4.9 && < 4.17
                    , HTTP                      >= 4000.3.7 && < 4000.4
                    , Ranged-sets               >= 0.3 && < 0.5
-                    , aeson                     >= 1.4.7 && < 1.6
-                    , ansi-wl-pprint            >= 0.6.7 && < 0.7
+                    , aeson                     >= 2.0.3 && < 2.1
                    , auto-update               >= 0.1.4 && < 0.2
                    , base64-bytestring         >= 1 && < 1.3
-                    , bytestring                >= 0.10.8 && < 0.11
+                    , bytestring                >= 0.10.8 && < 0.12
                    , case-insensitive          >= 1.2 && < 1.3
                    , cassava                   >= 0.4.5 && < 0.6
                    , configurator-pg           >= 0.2 && < 0.3
                    , containers                >= 0.5.7 && < 0.7
-                    , contravariant             >= 1.4 && < 1.6
                    , contravariant-extras      >= 0.3.3 && < 0.4
                    , cookie                    >= 0.4.2 && < 0.5
                    , either                    >= 4.4.1 && < 5.1
-                    , fast-logger               >= 2.4.5
                    , gitrev                    >= 1.2 && < 1.4
-                    , hasql                     >= 1.4 && < 1.5
-                    , hasql-dynamic-statements  == 0.3.1
+                    , hasql                     >= 1.4 && < 1.6
+                    , hasql-dynamic-statements  >= 0.3.1 && < 0.4
                    , hasql-notifications       >= 0.1 && < 0.3
                    , hasql-pool                >= 0.5 && < 0.6
                    , hasql-transaction         >= 1.0.1 && < 1.1
@@ -92,28 +94,33 @@ library
                    , http-types                >= 0.12.2 && < 0.13
                    , insert-ordered-containers >= 0.2.2 && < 0.3
                    , interpolatedstring-perl6  >= 1 && < 1.1
-                    , jose                      >= 0.8.1 && < 0.9
-                    , lens                      >= 4.14 && < 5.1
+                    , jose                      >= 0.8.5.1 && < 0.10
+                    , lens                      >= 4.14 && < 5.2
                    , lens-aeson                >= 1.0.1 && < 1.2
                    , mtl                       >= 2.2.2 && < 2.3
+                    , network                   >= 2.6 && < 3.2
                    , network-uri               >= 2.6.1 && < 2.8
                    , optparse-applicative      >= 0.13 && < 0.17
                    , parsec                    >= 3.1.11 && < 3.2
-                    , protolude                 >= 0.3 && < 0.4
+                    , protolude                 >= 0.3.1 && < 0.4
                    , regex-tdfa                >= 1.2.2 && < 1.4
                    , retry                     >= 0.7.4 && < 0.10
                    , scientific                >= 0.3.4 && < 0.4
-                    , swagger2                  >= 2.4 && < 2.7
+                    , swagger2                  >= 2.4 && < 2.9
                    , text                      >= 1.2.2 && < 1.3
-                    , time                      >= 1.6 && < 1.11
+                    , time                      >= 1.6 && < 1.12
                    , unordered-containers      >= 0.2.8 && < 0.3
+                    , vault                     >= 0.3.1.5 && < 0.4
                    , vector                    >= 0.11 && < 0.13
                    , wai                       >= 3.2.1 && < 3.3
                    , wai-cors                  >= 0.2.5 && < 0.3
-                    , wai-extra                 >= 3.0.19 && < 3.2
-                    , wai-logger                >= 2.3.2
-                    , wai-middleware-static     >= 0.8.1 && < 0.10
-                    , warp                      >= 3.2.12 && < 3.4
+                    , wai-extra                 >= 3.1.8 && < 3.2
+                    -- We already depend on wai-logger >= 2.3.7 indirectly via wai-extra,
+                    -- but we want to depend on 2.4.0 which fixes 'unknownSocket' log output
+                    -- for unix sockets; this is tested in test/io/test_io.py. See
+                    -- https://github.com/kazu-yamamoto/logger/commit/3a71ca70afdbb93d4ecf0083eeba1fbbbcab3fc3
+                    , wai-logger                >= 2.4.0
+                    , warp                      >= 3.3.19 && < 3.4
                      -- -fno-spec-constr may help keep compile time memory use in check,
                      --   see https://gitlab.haskell.org/ghc/ghc/issues/16017#note_219304
                      -- -optP-Wno-nonportable-include-path
@@ -123,7 +130,7 @@ library
                      -fno-spec-constr -optP-Wno-nonportable-include-path

  if flag(dev)
-    ghc-options: -O0
+    ghc-options: -O0 -fwrite-ide-info
    if flag(hpc)
      ghc-options: -fhpc -hpcdir .hpc
  else
@@ -133,7 +140,6 @@ library
    build-depends:
      unix
      , directory >= 1.2.6 && < 1.4
-      , network   >= 2.6 && < 3.2
    exposed-modules:
      PostgREST.Unix

@@ -143,16 +149,18 @@ executable postgrest
                      NoImplicitPrelude
  hs-source-dirs:     main
  main-is:            Main.hs
-  build-depends:      base                >= 4.9 && < 4.16
+  build-depends:      base                >= 4.9 && < 4.17
                    , containers          >= 0.5.7 && < 0.7
                    , postgrest
-                    , protolude           >= 0.3 && < 0.4
-  ghc-options:        -threaded -rtsopts "-with-rtsopts=-N -I2"
+                    , protolude           >= 0.3.1 && < 0.4
+  ghc-options:        -threaded -rtsopts "-with-rtsopts=-N -I0 -qg"
                      -O2 -Werror -Wall -fwarn-identities
                      -fno-spec-constr -optP-Wno-nonportable-include-path

  if flag(dev)
-    ghc-options: -O0
+    ghc-options: -O0 -fwrite-ide-info
+                 -- https://github.com/PostgREST/postgrest/issues/387
+                 -with-rtsopts=-K1K
    if flag(hpc)
      ghc-options: -fhpc -hpcdir .hpc
  else
@@ -164,57 +172,60 @@ test-suite spec
  default-extensions: OverloadedStrings
                      QuasiQuotes
                      NoImplicitPrelude
-  hs-source-dirs:     test
+  hs-source-dirs:     test/spec
  main-is:            Main.hs
-  other-modules:      Feature.AndOrParamsSpec
-                      Feature.AsymmetricJwtSpec
-                      Feature.AudienceJwtSecretSpec
-                      Feature.AuthSpec
-                      Feature.BinaryJwtSecretSpec
+  other-modules:      Feature.Auth.AsymmetricJwtSpec
+                      Feature.Auth.AudienceJwtSecretSpec
+                      Feature.Auth.AuthSpec
+                      Feature.Auth.BinaryJwtSecretSpec
+                      Feature.Auth.NoAnonSpec
+                      Feature.Auth.NoJwtSpec
                      Feature.ConcurrentSpec
                      Feature.CorsSpec
-                      Feature.DeleteSpec
-                      Feature.DisabledOpenApiSpec
-                      Feature.EmbedDisambiguationSpec
-                      Feature.EmbedInnerJoinSpec
                      Feature.ExtraSearchPathSpec
-                      Feature.HtmlRawOutputSpec
-                      Feature.InsertSpec
-                      Feature.IgnorePrivOpenApiSpec
-                      Feature.JsonOperatorSpec
                      Feature.LegacyGucsSpec
-                      Feature.MultipleSchemaSpec
-                      Feature.NoJwtSpec
-                      Feature.NonexistentSchemaSpec
-                      Feature.OpenApiSpec
+                      Feature.OpenApi.DisabledOpenApiSpec
+                      Feature.OpenApi.IgnorePrivOpenApiSpec
+                      Feature.OpenApi.OpenApiSpec
+                      Feature.OpenApi.ProxySpec
+                      Feature.OpenApi.RootSpec
+                      Feature.OpenApi.SecurityOpenApiSpec
                      Feature.OptionsSpec
-                      Feature.ProxySpec
-                      Feature.QueryLimitedSpec
-                      Feature.QuerySpec
-                      Feature.RangeSpec
-                      Feature.RawOutputTypesSpec
+                      Feature.Query.AndOrParamsSpec
+                      Feature.Query.ComputedRelsSpec
+                      Feature.Query.DeleteSpec
+                      Feature.Query.EmbedDisambiguationSpec
+                      Feature.Query.EmbedInnerJoinSpec
+                      Feature.Query.PlanSpec
+                      Feature.Query.HtmlRawOutputSpec
+                      Feature.Query.InsertSpec
+                      Feature.Query.JsonOperatorSpec
+                      Feature.Query.MultipleSchemaSpec
+                      Feature.Query.ErrorSpec
+                      Feature.Query.PgSafeUpdateSpec
+                      Feature.Query.PostGISSpec
+                      Feature.Query.QueryLimitedSpec
+                      Feature.Query.QuerySpec
+                      Feature.Query.RangeSpec
+                      Feature.Query.RawOutputTypesSpec
+                      Feature.Query.RpcSpec
+                      Feature.Query.SingularSpec
+                      Feature.Query.UnicodeSpec
+                      Feature.Query.UpdateSpec
+                      Feature.Query.UpsertSpec
                      Feature.RollbackSpec
-                      Feature.RootSpec
                      Feature.RpcPreRequestGucsSpec
-                      Feature.RpcSpec
-                      Feature.SingularSpec
-                      Feature.UnicodeSpec
-                      Feature.UpdateSpec
-                      Feature.UpsertSpec
                      SpecHelper
                      TestTypes
-  build-depends:      base              >= 4.9 && < 4.16
-                    , aeson             >= 1.4.7 && < 1.6
+  build-depends:      base              >= 4.9 && < 4.17
+                    , aeson             >= 2.0.3 && < 2.1
                    , aeson-qq          >= 0.8.1 && < 0.9
                    , async             >= 2.1.1 && < 2.3
                    , auto-update       >= 0.1.4 && < 0.2
                    , base64-bytestring >= 1 && < 1.3
-                    , bytestring        >= 0.10.8 && < 0.11
+                    , bytestring        >= 0.10.8 && < 0.12
                    , case-insensitive  >= 1.2 && < 1.3
-                    , cassava           >= 0.4.5 && < 0.6
                    , containers        >= 0.5.7 && < 0.7
-                    , contravariant     >= 1.4 && < 1.6
-                    , hasql             >= 1.4 && < 1.5
                    , hasql-pool        >= 0.5 && < 0.6
                    , hasql-transaction >= 1.0.1 && < 1.1
                    , heredoc           >= 0.2 && < 0.3
@@ -222,77 +233,73 @@ test-suite spec
                    , hspec-wai         >= 0.10 && < 0.12
                    , hspec-wai-json    >= 0.10 && < 0.12
                    , http-types        >= 0.12.3 && < 0.13
-                    , lens              >= 4.14 && < 5.1
+                    , lens              >= 4.14 && < 5.2
                    , lens-aeson        >= 1.0.1 && < 1.2
                    , monad-control     >= 1.0.1 && < 1.1
                    , postgrest
                    , process           >= 1.4.2 && < 1.7
-                    , protolude         >= 0.3 && < 0.4
+                    , protolude         >= 0.3.1 && < 0.4
                    , regex-tdfa        >= 1.2.2 && < 1.4
                    , text              >= 1.2.2 && < 1.3
-                    , time              >= 1.6 && < 1.11
                    , transformers-base >= 0.4.4 && < 0.5
                    , wai               >= 3.2.1 && < 3.3
                    , wai-extra         >= 3.0.19 && < 3.2
  ghc-options:        -O0 -Werror -Wall -fwarn-identities
                      -fno-spec-constr -optP-Wno-nonportable-include-path
                      -fno-warn-missing-signatures
+                      -fwrite-ide-info
+                      -- https://github.com/PostgREST/postgrest/issues/387
+                      -with-rtsopts=-K33K

 test-suite querycost
-  type:                exitcode-stdio-1.0
-  default-language:    Haskell2010
-  default-extensions:  OverloadedStrings
-                       QuasiQuotes
-                       NoImplicitPrelude
-  hs-source-dirs:      test
-  main-is:             QueryCost.hs
-  other-modules:       SpecHelper
-  build-depends:       base              >= 4.9 && < 4.16
-                     , aeson             >= 1.4.7 && < 1.6
-                     , aeson-qq          >= 0.8.1 && < 0.9
-                     , async             >= 2.1.1 && < 2.3
-                     , auto-update       >= 0.1.4 && < 0.2
-                     , base64-bytestring >= 1 && < 1.3
-                     , bytestring        >= 0.10.8 && < 0.11
-                     , case-insensitive  >= 1.2 && < 1.3
-                     , cassava           >= 0.4.5 && < 0.6
-                     , containers        >= 0.5.7 && < 0.7
-                     , contravariant     >= 1.4 && < 1.6
-                     , hasql             >= 1.4 && < 1.5
-                     , hasql-dynamic-statements  == 0.3.1
-                     , hasql-pool        >= 0.5 && < 0.6
-                     , hasql-transaction >= 1.0.1 && < 1.1
-                     , heredoc           >= 0.2 && < 0.3
-                     , hspec             >= 2.3 && < 2.9
-                     , hspec-wai         >= 0.10 && < 0.12
-                     , hspec-wai-json    >= 0.10 && < 0.12
-                     , http-types        >= 0.12.3 && < 0.13
-                     , lens              >= 4.14 && < 5.1
-                     , lens-aeson        >= 1.0.1 && < 1.2
-                     , monad-control     >= 1.0.1 && < 1.1
-                     , postgrest
-                     , process           >= 1.4.2 && < 1.7
-                     , protolude         >= 0.3 && < 0.4
-                     , regex-tdfa        >= 1.2.2 && < 1.4
-                     , text              >= 1.2.2 && < 1.3
-                     , time              >= 1.6 && < 1.11
-                     , transformers-base >= 0.4.4 && < 0.5
-                     , wai               >= 3.2.1 && < 3.3
-                     , wai-extra         >= 3.0.19 && < 3.2
-  ghc-options:         -O0 -Werror -Wall -fwarn-identities
-                       -fno-spec-constr -optP-Wno-nonportable-include-path
+  type:               exitcode-stdio-1.0
+  default-language:   Haskell2010
+  default-extensions: OverloadedStrings
+                      QuasiQuotes
+                      NoImplicitPrelude
+  hs-source-dirs:     test/spec
+  main-is:            QueryCost.hs
+  other-modules:      SpecHelper
+  build-depends:      base              >= 4.9 && < 4.17
+                    , aeson             >= 2.0.3 && < 2.1
+                    , base64-bytestring >= 1 && < 1.3
+                    , bytestring        >= 0.10.8 && < 0.12
+                    , case-insensitive  >= 1.2 && < 1.3
+                    , containers        >= 0.5.7 && < 0.7
+                    , contravariant     >= 1.4 && < 1.6
+                    , hasql             >= 1.4 && < 1.6
+                    , hasql-dynamic-statements >= 0.3.1 && < 0.4
+                    , hasql-pool        >= 0.5 && < 0.6
+                    , hasql-transaction >= 1.0.1 && < 1.1
+                    , heredoc           >= 0.2 && < 0.3
+                    , hspec             >= 2.3 && < 2.9
+                    , hspec-wai         >= 0.10 && < 0.12
+                    , hspec-wai-json    >= 0.10 && < 0.12
+                    , http-types        >= 0.12.3 && < 0.13
+                    , lens              >= 4.14 && < 5.2
+                    , lens-aeson        >= 1.0.1 && < 1.2
+                    , postgrest
+                    , process           >= 1.4.2 && < 1.7
+                    , protolude         >= 0.3.1 && < 0.4
+                    , regex-tdfa        >= 1.2.2 && < 1.4
+                    , wai-extra         >= 3.0.19 && < 3.2
+  ghc-options:        -O0 -Werror -Wall -fwarn-identities
+                      -fno-spec-constr -optP-Wno-nonportable-include-path
+                      -fwrite-ide-info
+                      -- https://github.com/PostgREST/postgrest/issues/387
+                      -with-rtsopts=-K1K

 test-suite doctests
-  type:                exitcode-stdio-1.0
-  default-language:    Haskell2010
-  default-extensions:  OverloadedStrings
-                       NoImplicitPrelude
-  hs-source-dirs:      test/doctests
-  main-is:             Main.hs
-  build-depends:       base              >= 4.9 && < 4.16
-                     , doctest           >= 0.8
-                     , postgrest
-                     , pretty-simple
-                     , protolude         >= 0.3 && < 0.4
-  ghc-options:         -threaded -O0 -Werror -Wall -fwarn-identities
-                       -fno-spec-constr -optP-Wno-nonportable-include-path
+  type:               exitcode-stdio-1.0
+  default-language:   Haskell2010
+  default-extensions: OverloadedStrings
+                      NoImplicitPrelude
+  hs-source-dirs:     test/doc
+  main-is:            Main.hs
+  build-depends:      base              >= 4.9 && < 4.17
+                    , doctest           >= 0.8
+                    , postgrest
+                    , pretty-simple
+                    , protolude         >= 0.3.1 && < 0.4
+  ghc-options:        -threaded -O0 -Werror -Wall -fwarn-identities
+                      -fno-spec-constr -optP-Wno-nonportable-include-path
@@ -11,7 +11,7 @@
 }:
 let
  postgrest =
-    import ./default.nix;
+    import ./default.nix { };

  inherit (postgrest) pkgs;

@@ -21,6 +21,7 @@ let
    [
      postgrest.cabalTools
      postgrest.devTools
+      postgrest.loadtest
      postgrest.nixpkgsTools
      postgrest.style
      postgrest.tests
@@ -37,6 +38,7 @@ lib.overrideDerivation postgrest.env (
      base.buildInputs ++ [
        pkgs.cabal-install
        pkgs.cabal2nix
+        pkgs.git
        pkgs.postgresql
        postgrest.hsie.bin
      ]
@@ -44,13 +46,16 @@ lib.overrideDerivation postgrest.env (

    shellHook =
      ''
-        source ${pkgs.bashCompletion}/etc/profile.d/bash_completion.sh
-        source ${postgrest.hsie.bashCompletion}
+        export HISTFILE=.history
+
+        source ${pkgs.bash-completion}/etc/profile.d/bash_completion.sh
+        source ${pkgs.git}/share/git/contrib/completion/git-completion.bash
+        source ${postgrest.hsie.bash-completion}

      ''
      + builtins.concatStringsSep "\n" (
-        builtins.map (bashCompletion: "source ${bashCompletion}") (
-          builtins.concatLists (builtins.map (toolbox: toolbox.bashCompletion) toolboxes)
+        builtins.map (bash-completion: "source ${bash-completion}") (
+          builtins.concatLists (builtins.map (toolbox: toolbox.bash-completion) toolboxes)
        )
      );
  }
@@ -0,0 +1,74 @@
+{-# LANGUAGE RecordWildCards #-}
+module PostgREST.Admin
+  ( postgrestAdmin
+  ) where
+
+import qualified Data.Text as T
+
+import Network.Socket
+import Network.Socket.ByteString
+
+import qualified Network.HTTP.Types.Status as HTTP
+import qualified Network.Wai               as Wai
+
+import qualified Hasql.Session as SQL
+
+import qualified PostgREST.AppState as AppState
+import           PostgREST.Config   (AppConfig (..))
+
+import Protolude
+
+-- | PostgREST admin application
+postgrestAdmin :: AppState.AppState -> AppConfig -> Wai.Application
+postgrestAdmin appState appConfig req respond  = do
+  isMainAppReachable  <- any isRight <$> reachMainApp appConfig
+  isSchemaCacheLoaded <- isJust <$> AppState.getDbStructure appState
+  isConnectionUp      <-
+    if configDbChannelEnabled appConfig
+      then AppState.getIsListenerOn appState
+      else isRight <$> AppState.usePool appState (SQL.sql "SELECT 1")
+
+  case Wai.pathInfo req of
+    ["ready"] ->
+      respond $ Wai.responseLBS (if isMainAppReachable && isConnectionUp && isSchemaCacheLoaded then HTTP.status200 else HTTP.status503) [] mempty
+    ["live"] ->
+      respond $ Wai.responseLBS (if isMainAppReachable then HTTP.status200 else HTTP.status503) [] mempty
+    _ ->
+      respond $ Wai.responseLBS HTTP.status404 [] mempty
+
+-- Try to connect to the main app socket
+-- Note that it doesn't even send a valid HTTP request, we just want to check that the main app is accepting connections
+-- The code for resolving the "*4", "!4", "*6", "!6", "*" special values is taken from
+-- https://hackage.haskell.org/package/streaming-commons-0.2.2.4/docs/src/Data.Streaming.Network.html#bindPortGenEx
+reachMainApp :: AppConfig -> IO [Either IOException ()]
+reachMainApp AppConfig{..} =
+  case configServerUnixSocket of
+    Just path ->  do
+      sock <- socket AF_UNIX Stream 0
+      (:[]) <$> try (do
+        connect sock $ SockAddrUnix path
+        withSocketsDo $ bracket (pure sock) close sendEmpty)
+    Nothing -> do
+      let
+        host | configServerHost `elem` ["*4", "!4", "*6", "!6", "*"] = Nothing
+             | otherwise                                             = Just configServerHost
+        filterAddrs xs =
+          case configServerHost of
+              "*4" -> ipv4Addrs xs ++ ipv6Addrs xs
+              "!4" -> ipv4Addrs xs
+              "*6" -> ipv6Addrs xs ++ ipv4Addrs xs
+              "!6" -> ipv6Addrs xs
+              _    -> xs
+        ipv4Addrs = filter ((/=) AF_INET6 . addrFamily)
+        ipv6Addrs = filter ((==) AF_INET6 . addrFamily)
+
+      addrs <- getAddrInfo (Just $ defaultHints { addrSocketType = Stream }) (T.unpack <$> host) (Just . show $ configServerPort)
+      tryAddr `traverse` filterAddrs addrs
+  where
+    sendEmpty sock = void $ send sock mempty
+    tryAddr :: AddrInfo -> IO (Either IOException ())
+    tryAddr addr = do
+      sock <- socket (addrFamily addr) (addrSocketType addr) (addrProtocol addr)
+      try $ do
+        connect sock $ addrAddress addr
+        withSocketsDo $ bracket (pure sock) close sendEmpty
@@ -20,18 +20,17 @@ module PostgREST.App
 import Control.Monad.Except     (liftEither)
 import Data.Either.Combinators  (mapLeft)
 import Data.List                (union)
+import Data.Maybe               (fromJust)
 import Data.String              (IsString (..))
-import Data.Time.Clock          (UTCTime)
 import Network.Wai.Handler.Warp (defaultSettings, setHost, setPort,
                                 setServerName)
 import System.Posix.Types       (FileMode)

 import qualified Data.ByteString.Char8           as BS
 import qualified Data.ByteString.Lazy            as LBS
-import qualified Data.HashMap.Strict             as M
+import qualified Data.HashMap.Strict             as HM
 import qualified Data.Set                        as S
-import qualified Hasql.DynamicStatements.Snippet as SQL
-import qualified Hasql.Pool                      as SQL
+import qualified Hasql.DynamicStatements.Snippet as SQL (Snippet)
 import qualified Hasql.Transaction               as SQL
 import qualified Hasql.Transaction.Sessions      as SQL
 import qualified Network.HTTP.Types.Header       as HTTP
@@ -40,10 +39,13 @@ import qualified Network.HTTP.Types.URI          as HTTP
 import qualified Network.Wai                     as Wai
 import qualified Network.Wai.Handler.Warp        as Warp

+import qualified PostgREST.Admin                    as Admin
 import qualified PostgREST.AppState                 as AppState
 import qualified PostgREST.Auth                     as Auth
+import qualified PostgREST.Cors                     as Cors
 import qualified PostgREST.DbStructure              as DbStructure
 import qualified PostgREST.Error                    as Error
+import qualified PostgREST.Logger                   as Logger
 import qualified PostgREST.Middleware               as Middleware
 import qualified PostgREST.OpenAPI                  as OpenAPI
 import qualified PostgREST.Query.QueryBuilder       as QueryBuilder
@@ -51,15 +53,15 @@ import qualified PostgREST.Query.Statements         as Statements
 import qualified PostgREST.RangeQuery               as RangeQuery
 import qualified PostgREST.Request.ApiRequest       as ApiRequest
 import qualified PostgREST.Request.DbRequestBuilder as ReqBuilder
+import qualified PostgREST.Request.Types            as ApiRequestTypes

 import PostgREST.AppState                (AppState)
+import PostgREST.Auth                    (AuthResult (..))
 import PostgREST.Config                  (AppConfig (..),
                                          LogLevel (..),
                                          OpenAPIMode (..))
 import PostgREST.Config.PgVersion        (PgVersion (..))
-import PostgREST.ContentType             (ContentType (..))
-import PostgREST.DbStructure             (DbStructure (..),
-                                          tablePKCols)
+import PostgREST.DbStructure             (DbStructure (..))
 import PostgREST.DbStructure.Identifiers (FieldName,
                                          QualifiedIdentifier (..),
                                          Schema)
@@ -70,24 +72,27 @@ import PostgREST.Error                   (Error)
 import PostgREST.GucHeader               (GucHeader,
                                          addHeadersIfNotIncluded,
                                          unwrapGucHeader)
+import PostgREST.MediaType               (MTPlanAttrs (..),
+                                          MediaType (..))
+import PostgREST.Query.Statements        (ResultSet (..))
 import PostgREST.Request.ApiRequest      (Action (..),
                                          ApiRequest (..),
                                          InvokeMethod (..),
-                                          Target (..))
+                                          Mutation (..), Target (..))
 import PostgREST.Request.Preferences     (PreferCount (..),
                                          PreferParameters (..),
                                          PreferRepresentation (..),
                                          toAppliedHeader)
-import PostgREST.Request.Types           (ReadRequest, fstFieldNames)
+import PostgREST.Request.QueryParams     (QueryParams (..))
+import PostgREST.Request.ReadQuery       (ReadRequest, fstFieldNames)
 import PostgREST.Version                 (prettyVersion)
 import PostgREST.Workers                 (connectionWorker, listener)

-import qualified PostgREST.ContentType      as ContentType
 import qualified PostgREST.DbStructure.Proc as Proc
+import qualified PostgREST.MediaType        as MediaType

 import Protolude hiding (Handler)

-
 data RequestContext = RequestContext
  { ctxConfig      :: AppConfig
  , ctxDbStructure :: DbStructure
@@ -113,6 +118,11 @@ run installHandlers maybeRunWithSocket appState = do
  when configDbChannelEnabled $ listener appState

  let app = postgrest configLogLevel appState (connectionWorker appState)
+      adminApp = Admin.postgrestAdmin appState conf
+
+  whenJust configAdminServerPort $ \adminPort -> do
+    AppState.logWithZTime appState $ "Admin server listening on port " <> show adminPort
+    void . forkIO $ Warp.runSettings (serverSettings conf & setPort adminPort) adminApp

  case configServerUnixSocket of
    Just socket ->
@@ -122,11 +132,14 @@ run installHandlers maybeRunWithSocket appState = do
          AppState.logWithZTime appState $ "Listening on unix socket " <> show socket
          runWithSocket (serverSettings conf) app configServerUnixSocketMode socket
        Nothing ->
-          panic "Cannot run with socket on non-unix plattforms."
+          panic "Cannot run with unix socket on non-unix platforms."
    Nothing ->
      do
        AppState.logWithZTime appState $ "Listening on port " <> show configServerPort
        Warp.runSettings (serverSettings conf) app
+  where
+    whenJust :: Applicative m => Maybe a -> (a -> m ()) -> m ()
+    whenJust mg f = maybe (pure ()) f mg

 serverSettings :: AppConfig -> Warp.Settings
 serverSettings AppConfig{..} =
@@ -137,28 +150,33 @@ serverSettings AppConfig{..} =

 -- | PostgREST application
 postgrest :: LogLevel -> AppState.AppState -> IO () -> Wai.Application
-postgrest logLev appState connWorker =
-  Middleware.pgrstMiddleware logLev $
-    \req respond -> do
-      time <- AppState.getTime appState
-      conf <- AppState.getConfig appState
-      maybeDbStructure <- AppState.getDbStructure appState
-      pgVer <- AppState.getPgVersion appState
-      jsonDbS <- AppState.getJsonDbS appState
+postgrest logLevel appState connWorker =
+  Cors.middleware .
+  Auth.middleware appState .
+  Logger.middleware logLevel $
+    -- fromJust can be used, because the auth middleware will **always** add
+    -- some AuthResult to the vault.
+    \req respond -> case fromJust $ Auth.getResult req of
+      Left err -> respond $ Error.errorResponseFor err
+      Right authResult -> do
+        conf <- AppState.getConfig appState
+        maybeDbStructure <- AppState.getDbStructure appState
+        pgVer <- AppState.getPgVersion appState
+        jsonDbS <- AppState.getJsonDbS appState

-      let
-        eitherResponse :: IO (Either Error Wai.Response)
-        eitherResponse =
-          runExceptT $ postgrestResponse conf maybeDbStructure jsonDbS pgVer (AppState.getPool appState) time req
+        let
+          eitherResponse :: IO (Either Error Wai.Response)
+          eitherResponse =
+            runExceptT $ postgrestResponse appState conf maybeDbStructure jsonDbS pgVer authResult req

-      response <- either Error.errorResponseFor identity <$> eitherResponse
-      -- Launch the connWorker when the connection is down.  The postgrest
-      -- function can respond successfully (with a stale schema cache) before
-      -- the connWorker is done.
-      let isPGAway = Wai.responseStatus response == HTTP.status503
-      when isPGAway connWorker
-      resp <- addRetryHint isPGAway appState response
-      respond resp
+        response <- either Error.errorResponseFor identity <$> eitherResponse
+        -- Launch the connWorker when the connection is down.  The postgrest
+        -- function can respond successfully (with a stale schema cache) before
+        -- the connWorker is done.
+        let isPGAway = Wai.responseStatus response == HTTP.status503
+        when isPGAway connWorker
+        resp <- addRetryHint isPGAway appState response
+        respond resp

 addRetryHint :: Bool -> AppState -> Wai.Response -> IO Wai.Response
 addRetryHint shouldAdd appState response = do
@@ -167,15 +185,15 @@ addRetryHint shouldAdd appState response = do
  return $ Wai.mapResponseHeaders (\hs -> if shouldAdd then h:hs else hs) response

 postgrestResponse
-  :: AppConfig
+  :: AppState.AppState
+  -> AppConfig
  -> Maybe DbStructure
  -> ByteString
  -> PgVersion
-  -> SQL.Pool
-  -> UTCTime
+  -> AuthResult
  -> Wai.Request
  -> Handler IO Wai.Response
-postgrestResponse conf maybeDbStructure jsonDbS pgVer pool time req = do
+postgrestResponse appState conf@AppConfig{..} maybeDbStructure jsonDbS pgVer AuthResult{..} req = do
  body <- lift $ Wai.strictRequestBody req

  dbStructure <-
@@ -183,32 +201,30 @@ postgrestResponse conf maybeDbStructure jsonDbS pgVer pool time req = do
      Just dbStructure ->
        return dbStructure
      Nothing ->
-        throwError Error.ConnectionLostError
+        throwError Error.NoSchemaCacheError

-  apiRequest@ApiRequest{..} <-
+  apiRequest <-
    liftEither . mapLeft Error.ApiRequestError $
      ApiRequest.userApiRequest conf dbStructure req body

-  -- The JWT must be checked before touching the db
-  jwtClaims <- Auth.jwtClaims conf (toUtf8Lazy iJWT) time
+  let ctx apiReq = RequestContext conf dbStructure apiReq pgVer

-  let
-    handleReq apiReq =
-      handleRequest $ RequestContext conf dbStructure apiReq pgVer
+  if iAction apiRequest == ActionInfo then
+    handleInfo (iTarget apiRequest) (ctx apiRequest)
+  else
+    runDbHandler appState (txMode apiRequest) (Just authRole /= configDbAnonRole) configDbPreparedStatements .
+      Middleware.optionalRollback conf apiRequest $
+        Middleware.runPgLocals conf authClaims authRole (handleRequest . ctx) apiRequest jsonDbS pgVer

-  runDbHandler pool (txMode apiRequest) jwtClaims (configDbPreparedStatements conf) .
-    Middleware.optionalRollback conf apiRequest $
-      Middleware.runPgLocals conf jwtClaims handleReq apiRequest jsonDbS pgVer
-
-runDbHandler :: SQL.Pool -> SQL.Mode -> Auth.JWTClaims -> Bool -> DbHandler a -> Handler IO a
-runDbHandler pool mode jwtClaims prepared handler = do
+runDbHandler :: AppState.AppState -> SQL.Mode -> Bool -> Bool -> DbHandler b -> Handler IO b
+runDbHandler appState mode authenticated prepared handler = do
  dbResp <-
    let transaction = if prepared then SQL.transaction else SQL.unpreparedTransaction in
-    lift . SQL.use pool . transaction SQL.ReadCommitted mode $ runExceptT handler
+    lift . AppState.usePool appState . transaction SQL.ReadCommitted mode $ runExceptT handler

  resp <-
    liftEither . mapLeft Error.PgErr $
-      mapLeft (Error.PgError $ Auth.containsRole jwtClaims) dbResp
+      mapLeft (Error.PgError authenticated) dbResp

  liftEither resp

@@ -217,22 +233,22 @@ handleRequest context@(RequestContext _ _ ApiRequest{..} _) =
  case (iAction, iTarget) of
    (ActionRead headersOnly, TargetIdent identifier) ->
      handleRead headersOnly identifier context
-    (ActionCreate, TargetIdent identifier) ->
+    (ActionMutate MutationCreate, TargetIdent identifier) ->
      handleCreate identifier context
-    (ActionUpdate, TargetIdent identifier) ->
+    (ActionMutate MutationUpdate, TargetIdent identifier) ->
      handleUpdate identifier context
-    (ActionSingleUpsert, TargetIdent identifier) ->
+    (ActionMutate MutationSingleUpsert, TargetIdent identifier) ->
      handleSingleUpsert identifier context
-    (ActionDelete, TargetIdent identifier) ->
+    (ActionMutate MutationDelete, TargetIdent identifier) ->
      handleDelete identifier context
-    (ActionInfo, TargetIdent identifier) ->
-      handleInfo identifier context
    (ActionInvoke invMethod, TargetProc proc _) ->
      handleInvoke invMethod proc context
    (ActionInspect headersOnly, TargetDefaultSpec tSchema) ->
      handleOpenApi headersOnly tSchema context
    _ ->
-      throwError Error.NotFound
+      -- This is unreachable as the ApiRequest.hs rejects it before
+      -- TODO Refactor the Action/Target types to remove this line
+      throwError $ Error.ApiRequestError ApiRequestTypes.NotFound

 handleRead :: Bool -> QualifiedIdentifier -> RequestContext -> DbHandler Wai.Response
 handleRead headersOnly identifier context@RequestContext{..} = do
@@ -244,9 +260,9 @@ handleRead headersOnly identifier context@RequestContext{..} = do
    AppConfig{..} = ctxConfig
    countQuery = QueryBuilder.readRequestToCountQuery req

-  (tableTotal, queryTotal, _ , body, gucHeaders, gucStatus) <-
-    lift . SQL.statement mempty $
-      Statements.createReadStatement
+  resultSet <-
+     lift . SQL.statement mempty $
+      Statements.prepareRead
        (QueryBuilder.readRequestToQuery req)
        (if iPreferCount == Just EstimatedCount then
           -- LIMIT maxRows + 1 so we can determine below that maxRows was surpassed
@@ -254,29 +270,33 @@ handleRead headersOnly identifier context@RequestContext{..} = do
         else
           countQuery
        )
-        (iAcceptContentType == CTSingularJSON)
        (shouldCount iPreferCount)
-        (iAcceptContentType == CTTextCSV)
+        iAcceptMediaType
        bField
        configDbPreparedStatements

-  total <- readTotal ctxConfig ctxApiRequest tableTotal countQuery
-  response <- liftEither $ gucResponse <$> gucStatus <*> gucHeaders
+  case resultSet of
+    RSStandard{..} -> do
+      total <- readTotal ctxConfig ctxApiRequest rsTableTotal countQuery
+      response <- liftEither $ gucResponse <$> rsGucStatus <*> rsGucHeaders

-  let
-    (status, contentRange) = RangeQuery.rangeStatusHeader iTopLevelRange queryTotal total
-    headers =
-      [ contentRange
-      , ( "Content-Location"
-        , "/"
-            <> toUtf8 (qiName identifier)
-            <> if BS.null iCanonicalQS then mempty else "?" <> iCanonicalQS
-        )
-      ]
-      ++ contentTypeHeaders context
+      let
+        (status, contentRange) = RangeQuery.rangeStatusHeader iTopLevelRange rsQueryTotal total
+        headers =
+          [ contentRange
+          , ( "Content-Location"
+            , "/"
+                <> toUtf8 (qiName identifier)
+                <> if BS.null (qsCanonical iQueryParams) then mempty else "?" <> qsCanonical iQueryParams
+            )
+          ]
+          ++ contentTypeHeaders context

-  failNotSingular iAcceptContentType queryTotal . response status headers $
-    if headersOnly then mempty else LBS.fromStrict body
+      failNotSingular iAcceptMediaType rsQueryTotal . response status headers $
+        if headersOnly then mempty else LBS.fromStrict rsBody
+
+    RSPlan plan ->
+      pure $ Wai.responseLBS HTTP.status200 (contentTypeHeaders context) $ LBS.fromStrict plan

 readTotal :: AppConfig -> ApiRequest -> Maybe Int64 -> SQL.Snippet -> DbHandler (Maybe Int64)
 readTotal AppConfig{..} ApiRequest{..} tableTotal countQuery =
@@ -292,131 +312,159 @@ readTotal AppConfig{..} ApiRequest{..} tableTotal countQuery =
      return tableTotal
  where
    explain =
-      lift . SQL.statement mempty . Statements.createExplainStatement countQuery $
+      lift . SQL.statement mempty . Statements.preparePlanRows countQuery $
        configDbPreparedStatements

 handleCreate :: QualifiedIdentifier -> RequestContext -> DbHandler Wai.Response
 handleCreate identifier@QualifiedIdentifier{..} context@RequestContext{..} = do
  let
    ApiRequest{..} = ctxApiRequest
-    pkCols = tablePKCols ctxDbStructure qiSchema qiName
+    pkCols = if iPreferRepresentation /= None || isJust iPreferResolution
+      then maybe mempty tablePKCols $ HM.lookup identifier $ dbTables ctxDbStructure
+      else mempty

-  WriteQueryResult{..} <- writeQuery identifier True pkCols context
+  resultSet <- writeQuery MutationCreate identifier True pkCols context

-  let
-    response = gucResponse resGucStatus resGucHeaders
-    headers =
-      catMaybes
-        [ if null resFields then
-            Nothing
-          else
-            Just
-              ( HTTP.hLocation
-              , "/"
-                  <> toUtf8 qiName
-                  <> HTTP.renderSimpleQuery True (splitKeyValue <$> resFields)
-              )
-        , Just . RangeQuery.contentRangeH 1 0 $
-            if shouldCount iPreferCount then Just resQueryTotal else Nothing
-        , if null pkCols && isNothing iOnConflict then
-            Nothing
-          else
-            toAppliedHeader <$> iPreferResolution
-        ]
+  case resultSet of
+    RSStandard{..} -> do

-  failNotSingular iAcceptContentType resQueryTotal $
-    if iPreferRepresentation == Full then
-      response HTTP.status201 (headers ++ contentTypeHeaders context) (LBS.fromStrict resBody)
-    else
-      response HTTP.status201 headers mempty
+      response <- liftEither $ gucResponse <$> rsGucStatus <*> rsGucHeaders
+
+      let
+        headers =
+          catMaybes
+            [ if null rsLocation then
+                Nothing
+              else
+                Just
+                  ( HTTP.hLocation
+                  , "/"
+                      <> toUtf8 qiName
+                      <> HTTP.renderSimpleQuery True rsLocation
+                  )
+            , Just . RangeQuery.contentRangeH 1 0 $
+                if shouldCount iPreferCount then Just rsQueryTotal else Nothing
+            , if null pkCols && isNothing (qsOnConflict iQueryParams) then
+                Nothing
+              else
+                toAppliedHeader <$> iPreferResolution
+            ]
+
+      failNotSingular iAcceptMediaType rsQueryTotal $
+        if iPreferRepresentation == Full then
+          response HTTP.status201 (headers ++ contentTypeHeaders context) (LBS.fromStrict rsBody)
+        else
+          response HTTP.status201 headers mempty
+
+    RSPlan plan ->
+      pure $ Wai.responseLBS HTTP.status200 (contentTypeHeaders context) $ LBS.fromStrict plan

 handleUpdate :: QualifiedIdentifier -> RequestContext -> DbHandler Wai.Response
 handleUpdate identifier context@(RequestContext _ _ ApiRequest{..} _) = do
-  WriteQueryResult{..} <- writeQuery identifier False mempty context
+  resultSet <- writeQuery MutationUpdate identifier False mempty context

-  let
-    response = gucResponse resGucStatus resGucHeaders
-    fullRepr = iPreferRepresentation == Full
-    updateIsNoOp = S.null iColumns
-    status
-      | resQueryTotal == 0 && not updateIsNoOp = HTTP.status404
-      | fullRepr = HTTP.status200
-      | otherwise = HTTP.status204
-    contentRangeHeader =
-      RangeQuery.contentRangeH 0 (resQueryTotal - 1) $
-        if shouldCount iPreferCount then Just resQueryTotal else Nothing
+  case resultSet of
+    RSStandard{..} -> do
+      response <- liftEither $ gucResponse <$> rsGucStatus <*> rsGucHeaders

-  failNotSingular iAcceptContentType resQueryTotal $
-    if fullRepr then
-      response status (contentTypeHeaders context ++ [contentRangeHeader]) (LBS.fromStrict resBody)
-    else
-      response status [contentRangeHeader] mempty
+      let
+        fullRepr = iPreferRepresentation == Full
+        updateIsNoOp = S.null iColumns
+        status
+          | rsQueryTotal == 0 && not updateIsNoOp = HTTP.status404
+          | fullRepr = HTTP.status200
+          | otherwise = HTTP.status204
+        contentRangeHeader =
+          RangeQuery.contentRangeH 0 (rsQueryTotal - 1) $
+            if shouldCount iPreferCount then Just rsQueryTotal else Nothing
+
+      failChangesOffLimits (RangeQuery.rangeLimit iTopLevelRange) rsQueryTotal =<<
+        failNotSingular iAcceptMediaType rsQueryTotal (
+          if fullRepr then
+            response status (contentTypeHeaders context ++ [contentRangeHeader]) (LBS.fromStrict rsBody)
+          else
+            response status [contentRangeHeader] mempty)
+
+    RSPlan plan ->
+      pure $ Wai.responseLBS HTTP.status200 (contentTypeHeaders context) $ LBS.fromStrict plan

 handleSingleUpsert :: QualifiedIdentifier -> RequestContext-> DbHandler Wai.Response
-handleSingleUpsert identifier context@(RequestContext _ _ ApiRequest{..} _) = do
-  when (iTopLevelRange /= RangeQuery.allRange) $
-    throwError Error.PutRangeNotAllowedError
+handleSingleUpsert identifier context@(RequestContext _ ctxDbStructure ApiRequest{..} _) = do
+  let pkCols = maybe mempty tablePKCols $ HM.lookup identifier $ dbTables ctxDbStructure

-  WriteQueryResult{..} <- writeQuery identifier False mempty context
+  resultSet <- writeQuery MutationSingleUpsert identifier False pkCols context

-  let response = gucResponse resGucStatus resGucHeaders
+  case resultSet of
+    RSStandard {..} -> do

-  -- Makes sure the querystring pk matches the payload pk
-  -- e.g. PUT /items?id=eq.1 { "id" : 1, .. } is accepted,
-  -- PUT /items?id=eq.14 { "id" : 2, .. } is rejected.
-  -- If this condition is not satisfied then nothing is inserted,
-  -- check the WHERE for INSERT in QueryBuilder.hs to see how it's done
-  when (resQueryTotal /= 1) $ do
-    lift SQL.condemn
-    throwError Error.PutMatchingPkError
+      response <- liftEither $ gucResponse <$> rsGucStatus <*> rsGucHeaders

-  return $
-    if iPreferRepresentation == Full then
-      response HTTP.status200 (contentTypeHeaders context) (LBS.fromStrict resBody)
-    else
-      response HTTP.status204 (contentTypeHeaders context) mempty
+      -- Makes sure the querystring pk matches the payload pk
+      -- e.g. PUT /items?id=eq.1 { "id" : 1, .. } is accepted,
+      -- PUT /items?id=eq.14 { "id" : 2, .. } is rejected.
+      -- If this condition is not satisfied then nothing is inserted,
+      -- check the WHERE for INSERT in QueryBuilder.hs to see how it's done
+      when (rsQueryTotal /= 1) $ do
+        lift SQL.condemn
+        throwError Error.PutMatchingPkError
+
+      return $
+        if iPreferRepresentation == Full then
+          response HTTP.status200 (contentTypeHeaders context) (LBS.fromStrict rsBody)
+        else
+          response HTTP.status204 [] mempty
+
+    RSPlan plan ->
+      pure $ Wai.responseLBS HTTP.status200 (contentTypeHeaders context) $ LBS.fromStrict plan

 handleDelete :: QualifiedIdentifier -> RequestContext -> DbHandler Wai.Response
 handleDelete identifier context@(RequestContext _ _ ApiRequest{..} _) = do
-  WriteQueryResult{..} <- writeQuery identifier False mempty context
+  resultSet <- writeQuery MutationDelete identifier False mempty context

-  let
-    response = gucResponse resGucStatus resGucHeaders
-    contentRangeHeader =
-      RangeQuery.contentRangeH 1 0 $
-        if shouldCount iPreferCount then Just resQueryTotal else Nothing
+  case resultSet of
+    RSStandard {..} -> do

-  failNotSingular iAcceptContentType resQueryTotal $
-    if iPreferRepresentation == Full then
-      response HTTP.status200
-        (contentTypeHeaders context ++ [contentRangeHeader])
-        (LBS.fromStrict resBody)
-    else
-      response HTTP.status204 [contentRangeHeader] mempty
+      response <- liftEither $ gucResponse <$> rsGucStatus <*> rsGucHeaders

-handleInfo :: Monad m => QualifiedIdentifier -> RequestContext -> Handler m Wai.Response
-handleInfo identifier RequestContext{..} =
-  case find tableMatches $ dbTables ctxDbStructure of
-    Just table ->
-      return $ Wai.responseLBS HTTP.status200 [allOrigins, allowH table] mempty
-    Nothing ->
-      throwError Error.NotFound
+      let
+        contentRangeHeader =
+          RangeQuery.contentRangeH 1 0 $
+            if shouldCount iPreferCount then Just rsQueryTotal else Nothing
+
+      failChangesOffLimits (RangeQuery.rangeLimit iTopLevelRange) rsQueryTotal =<<
+        failNotSingular iAcceptMediaType rsQueryTotal (
+          if iPreferRepresentation == Full then
+            response HTTP.status200
+              (contentTypeHeaders context ++ [contentRangeHeader])
+              (LBS.fromStrict rsBody)
+          else
+            response HTTP.status204 [contentRangeHeader] mempty)
+
+    RSPlan plan ->
+      pure $ Wai.responseLBS HTTP.status200 (contentTypeHeaders context) $ LBS.fromStrict plan
+
+handleInfo :: Monad m => Target -> RequestContext -> Handler m Wai.Response
+handleInfo target RequestContext{..} =
+  case target of
+    TargetIdent identifier ->
+      case HM.lookup identifier (dbTables ctxDbStructure) of
+        Just tbl -> infoResponse $ allowH tbl
+        Nothing  -> throwError $ Error.ApiRequestError ApiRequestTypes.NotFound
+    TargetProc pd _
+      | pdVolatility pd == Volatile -> infoResponse "OPTIONS,POST"
+      | otherwise                   -> infoResponse "OPTIONS,GET,HEAD,POST"
+    TargetDefaultSpec _             -> infoResponse "OPTIONS,GET,HEAD"
  where
+    infoResponse allowHeader = return $ Wai.responseLBS HTTP.status200 [allOrigins, (HTTP.hAllow, allowHeader)] mempty
    allOrigins = ("Access-Control-Allow-Origin", "*")
    allowH table =
-      ( HTTP.hAllow
-      , BS.intercalate "," $
-          ["OPTIONS,GET,HEAD"]
-          ++ ["POST" | tableInsertable table]
-          ++ ["PUT" | tableInsertable table && tableUpdatable table && hasPK]
-          ++ ["PATCH" | tableUpdatable table]
-          ++ ["DELETE" | tableDeletable table]
-      )
-    tableMatches table =
-      tableName table == qiName identifier
-      && tableSchema table == qiSchema identifier
-    hasPK =
-      not $ null $ tablePKCols ctxDbStructure (qiSchema identifier) (qiName identifier)
+      let hasPK = not . null $ tablePKCols table in
+      BS.intercalate "," $
+          ["OPTIONS,GET,HEAD"] ++
+          ["POST" | tableInsertable table] ++
+          ["PUT" | tableInsertable table && tableUpdatable table && hasPK] ++
+          ["PATCH" | tableUpdatable table] ++
+          ["DELETE" | tableDeletable table]

 handleInvoke :: InvokeMethod -> ProcDescription -> RequestContext -> DbHandler Wai.Response
 handleInvoke invMethod proc context@RequestContext{..} = do
@@ -433,31 +481,37 @@ handleInvoke invMethod proc context@RequestContext{..} = do

  let callReq = ReqBuilder.callRequest proc ctxApiRequest req

-  (tableTotal, queryTotal, body, gucHeaders, gucStatus) <-
+  resultSet <-
    lift . SQL.statement mempty $
-      Statements.callProcStatement
+      Statements.prepareCall
        (Proc.procReturnsScalar proc)
        (Proc.procReturnsSingle proc)
        (QueryBuilder.requestToCallProcQuery callReq)
        (QueryBuilder.readRequestToQuery req)
        (QueryBuilder.readRequestToCountQuery req)
        (shouldCount iPreferCount)
-        (iAcceptContentType == CTSingularJSON)
-        (iAcceptContentType == CTTextCSV)
+        iAcceptMediaType
        (iPreferParameters == Just MultipleObjects)
        bField
        (configDbPreparedStatements ctxConfig)

-  response <- liftEither $ gucResponse <$> gucStatus <*> gucHeaders
+  case resultSet of
+    RSStandard {..} -> do
+      response <- liftEither $ gucResponse <$> rsGucStatus <*> rsGucHeaders
+      let
+        (status, contentRange) =
+          RangeQuery.rangeStatusHeader iTopLevelRange rsQueryTotal rsTableTotal

-  let
-    (status, contentRange) =
-      RangeQuery.rangeStatusHeader iTopLevelRange queryTotal tableTotal
+      failNotSingular iAcceptMediaType rsQueryTotal $
+        if Proc.procReturnsVoid proc then
+          response HTTP.status204 [contentRange] mempty
+        else
+          response status
+            (contentTypeHeaders context ++ [contentRange])
+            (if invMethod == InvHead then mempty else LBS.fromStrict rsBody)

-  failNotSingular iAcceptContentType queryTotal $
-    response status
-      (contentTypeHeaders context ++ [contentRange])
-      (if invMethod == InvHead then mempty else LBS.fromStrict body)
+    RSPlan plan ->
+      pure $ Wai.responseLBS HTTP.status200 (contentTypeHeaders context) $ LBS.fromStrict plan

 handleOpenApi :: Bool -> Schema -> RequestContext -> DbHandler Wai.Response
 handleOpenApi headersOnly tSchema (RequestContext conf@AppConfig{..} dbStructure apiRequest ctxPgVersion) = do
@@ -465,20 +519,20 @@ handleOpenApi headersOnly tSchema (RequestContext conf@AppConfig{..} dbStructure
    lift $ case configOpenApiMode of
      OAFollowPriv ->
        OpenAPI.encode conf dbStructure
-           <$> SQL.statement tSchema (DbStructure.accessibleTables ctxPgVersion configDbPreparedStatements)
-           <*> SQL.statement tSchema (DbStructure.accessibleProcs configDbPreparedStatements)
+           <$> SQL.statement [tSchema] (DbStructure.accessibleTables ctxPgVersion configDbPreparedStatements)
+           <*> SQL.statement tSchema (DbStructure.accessibleProcs ctxPgVersion configDbPreparedStatements)
           <*> SQL.statement tSchema (DbStructure.schemaDescription configDbPreparedStatements)
      OAIgnorePriv ->
        OpenAPI.encode conf dbStructure
-              (filter (\x -> tableSchema x == tSchema) $ DbStructure.dbTables dbStructure)
-              (M.filterWithKey (\(QualifiedIdentifier sch _) _ ->  sch == tSchema) $ DbStructure.dbProcs dbStructure)
+              (HM.filterWithKey (\(QualifiedIdentifier sch _) _ ->  sch == tSchema) $ DbStructure.dbTables dbStructure)
+              (HM.filterWithKey (\(QualifiedIdentifier sch _) _ ->  sch == tSchema) $ DbStructure.dbProcs dbStructure)
          <$> SQL.statement tSchema (DbStructure.schemaDescription configDbPreparedStatements)
      OADisabled ->
        pure mempty

  return $
    Wai.responseLBS HTTP.status200
-      (ContentType.toHeader CTOpenAPI : maybeToList (profileHeader apiRequest))
+      (MediaType.toContentType MTOpenAPI : maybeToList (profileHeader apiRequest))
      (if headersOnly then mempty else body)

 txMode :: ApiRequest -> SQL.Mode
@@ -501,38 +555,25 @@ txMode ApiRequest{..} =
    _ ->
      SQL.Write

-- | Result from executing a write query on the database
-data WriteQueryResult = WriteQueryResult
-  { resQueryTotal :: Int64
-  , resFields     :: [ByteString]
-  , resBody       :: ByteString
-  , resGucStatus  :: Maybe HTTP.Status
-  , resGucHeaders :: [GucHeader]
-  }
-
-writeQuery :: QualifiedIdentifier -> Bool -> [Text] -> RequestContext -> DbHandler WriteQueryResult
-writeQuery identifier@QualifiedIdentifier{..} isInsert pkCols context@RequestContext{..} = do
+writeQuery :: Mutation -> QualifiedIdentifier -> Bool -> [Text] -> RequestContext -> DbHandler ResultSet
+writeQuery mutation identifier@QualifiedIdentifier{..} isInsert pkCols context@RequestContext{..} = do
  readReq <- readRequest identifier context

  mutateReq <-
    liftEither $
-      ReqBuilder.mutateRequest qiSchema qiName ctxApiRequest
-        (tablePKCols ctxDbStructure qiSchema qiName)
+      ReqBuilder.mutateRequest mutation qiSchema qiName ctxApiRequest
+        pkCols
        readReq

-  (_, queryTotal, fields, body, gucHeaders, gucStatus) <-
-    lift . SQL.statement mempty $
-      Statements.createWriteStatement
-        (QueryBuilder.readRequestToQuery readReq)
-        (QueryBuilder.mutateRequestToQuery mutateReq)
-        (iAcceptContentType ctxApiRequest == CTSingularJSON)
-        isInsert
-        (iAcceptContentType ctxApiRequest == CTTextCSV)
-        (iPreferRepresentation ctxApiRequest)
-        pkCols
-        (configDbPreparedStatements ctxConfig)
-
-  liftEither $ WriteQueryResult queryTotal fields body <$> gucStatus <*> gucHeaders
+  lift . SQL.statement mempty $
+    Statements.prepareWrite
+      (QueryBuilder.readRequestToQuery readReq)
+      (QueryBuilder.mutateRequestToQuery mutateReq)
+      isInsert
+      (iAcceptMediaType ctxApiRequest)
+      (iPreferRepresentation ctxApiRequest)
+      pkCols
+      (configDbPreparedStatements ctxConfig)

 -- | Response with headers and status overridden from GUCs.
 gucResponse
@@ -549,15 +590,25 @@ gucResponse gucStatus gucHeaders status headers =
 -- |
 -- Fail a response if a single JSON object was requested and not exactly one
 -- was found.
-failNotSingular :: ContentType -> Int64 -> Wai.Response -> DbHandler Wai.Response
-failNotSingular contentType queryTotal response =
-  if contentType == CTSingularJSON && queryTotal /= 1 then
+failNotSingular :: MediaType -> Int64 -> Wai.Response -> DbHandler Wai.Response
+failNotSingular mediaType queryTotal response =
+  if mediaType == MTSingularJSON && queryTotal /= 1 then
    do
      lift SQL.condemn
      throwError $ Error.singularityError queryTotal
  else
    return response

+failChangesOffLimits :: Maybe Integer -> Int64 -> Wai.Response -> DbHandler Wai.Response
+failChangesOffLimits (Just maxChanges) queryTotal response =
+  if queryTotal > fromIntegral maxChanges
+  then do
+      lift SQL.condemn
+      throwError $ Error.OffLimitsChangesError queryTotal maxChanges
+  else
+    return response
+failChangesOffLimits _ _ response = return response
+
 shouldCount :: Maybe PreferCount -> Bool
 shouldCount preferCount =
  preferCount == Just ExactCount || preferCount == Just EstimatedCount
@@ -575,16 +626,16 @@ readRequest QualifiedIdentifier{..} (RequestContext AppConfig{..} dbStructure ap

 contentTypeHeaders :: RequestContext -> [HTTP.Header]
 contentTypeHeaders RequestContext{..} =
-  ContentType.toHeader (iAcceptContentType ctxApiRequest) : maybeToList (profileHeader ctxApiRequest)
+  MediaType.toContentType (iAcceptMediaType ctxApiRequest) : maybeToList (profileHeader ctxApiRequest)

-- | If raw(binary) output is requested, check that ContentType is one of the
-- admitted rawContentTypes and that`?select=...` contains only one field other
+-- | If raw(binary) output is requested, check that MediaType is one of the
+-- admitted rawMediaTypes and that`?select=...` contains only one field other
 -- than `*`
 binaryField :: Monad m => RequestContext -> ReadRequest -> Handler m (Maybe FieldName)
 binaryField RequestContext{..} readReq
-  | returnsScalar (iTarget ctxApiRequest) && iAcceptContentType ctxApiRequest `elem` rawContentTypes ctxConfig =
+  | returnsScalar (iTarget ctxApiRequest) && isRawMediaType =
      return $ Just "pgrst_scalar"
-  | iAcceptContentType ctxApiRequest `elem` rawContentTypes ctxConfig =
+  | isRawMediaType =
      let
        fldNames = fstFieldNames readReq
        fieldName = headMay fldNames
@@ -592,20 +643,18 @@ binaryField RequestContext{..} readReq
      if length fldNames == 1 && fieldName /= Just "*" then
        return fieldName
      else
-        throwError $ Error.BinaryFieldError (iAcceptContentType ctxApiRequest)
+        throwError $ Error.BinaryFieldError mediaType
  | otherwise =
      return Nothing
-
-rawContentTypes :: AppConfig -> [ContentType]
-rawContentTypes AppConfig{..} =
-  (ContentType.decodeContentType <$> configRawMediaTypes) `union` [CTOctetStream, CTTextPlain]
+  where
+    mediaType = iAcceptMediaType ctxApiRequest
+    isRawMediaType = mediaType `elem` configRawMediaTypes ctxConfig `union` [MTOctetStream, MTTextPlain, MTTextXML] || isRawPlan mediaType
+    isRawPlan mt = case mt of
+      MTPlan (MTPlanAttrs (Just MTOctetStream) _ _) -> True
+      MTPlan (MTPlanAttrs (Just MTTextPlain) _ _)   -> True
+      MTPlan (MTPlanAttrs (Just MTTextXML) _ _)     -> True
+      _                                             -> False

 profileHeader :: ApiRequest -> Maybe HTTP.Header
 profileHeader ApiRequest{..} =
  (,) "Content-Profile" <$> (toUtf8 <$> iProfile)
-
-splitKeyValue :: ByteString -> (ByteString, ByteString)
-splitKeyValue kv =
-  (k, BS.tail v)
-  where
-    (k, v) = BS.break (== '=') kv
@@ -2,30 +2,33 @@

 module PostgREST.AppState
  ( AppState
+  , destroy
  , getConfig
  , getDbStructure
-  , getIsWorkerOn
+  , getIsListenerOn
  , getJsonDbS
  , getMainThreadId
  , getPgVersion
-  , getPool
-  , getTime
  , getRetryNextIn
+  , getTime
+  , getWorkerSem
  , init
  , initWithPool
  , logWithZTime
  , putConfig
  , putDbStructure
-  , putIsWorkerOn
+  , putIsListenerOn
  , putJsonDbS
  , putPgVersion
  , putRetryNextIn
  , releasePool
  , signalListener
+  , usePool
  , waitListener
  ) where

-import qualified Hasql.Pool as SQL
+import qualified Hasql.Pool    as SQL
+import qualified Hasql.Session as SQL

 import Control.AutoUpdate (defaultUpdateSettings, mkAutoUpdate,
                           updateAction)
@@ -49,10 +52,12 @@ data AppState = AppState
  , stateDbStructure  :: IORef (Maybe DbStructure)
  -- | Cached DbStructure in json
  , stateJsonDbS      :: IORef ByteString
-  -- | Helper ref to make sure just one connectionWorker can run at a time
-  , stateIsWorkerOn   :: IORef Bool
+  -- | Binary semaphore to make sure just one connectionWorker can run at a time
+  , stateWorkerSem    :: MVar ()
  -- | Binary semaphore used to sync the listener(NOTIFY reload) with the connectionWorker.
  , stateListener     :: MVar ()
+  -- | State of the LISTEN channel, used for the admin server checks
+  , stateIsListenerOn :: IORef Bool
  -- | Config that can change at runtime
  , stateConf         :: IORef AppConfig
  -- | Time used for verifying JWT expiration
@@ -76,23 +81,27 @@ initWithPool newPool conf =
    <$> newIORef minimumPgVersion -- assume we're in a supported version when starting, this will be corrected on a later step
    <*> newIORef Nothing
    <*> newIORef mempty
-    <*> newIORef False
    <*> newEmptyMVar
+    <*> newEmptyMVar
+    <*> newIORef False
    <*> newIORef conf
    <*> mkAutoUpdate defaultUpdateSettings { updateAction = getCurrentTime }
    <*> mkAutoUpdate defaultUpdateSettings { updateAction = getZonedTime }
    <*> myThreadId
    <*> newIORef 0

+destroy :: AppState -> IO ()
+destroy = releasePool
+
 initPool :: AppConfig -> IO SQL.Pool
 initPool AppConfig{..} =
  SQL.acquire (configDbPoolSize, configDbPoolTimeout, toUtf8 configDbUri)

-getPool :: AppState -> SQL.Pool
-getPool = statePool
+usePool :: AppState -> SQL.Session a -> IO (Either SQL.UsageError a)
+usePool AppState{..} = SQL.use statePool

 releasePool :: AppState -> IO ()
-releasePool AppState{..} = SQL.release statePool >> throwTo stateMainThreadId UserInterrupt
+releasePool AppState{..} = SQL.release statePool

 getPgVersion :: AppState -> IO PgVersion
 getPgVersion = readIORef . statePgVersion
@@ -103,9 +112,8 @@ putPgVersion = atomicWriteIORef . statePgVersion
 getDbStructure :: AppState -> IO (Maybe DbStructure)
 getDbStructure = readIORef . stateDbStructure

-putDbStructure :: AppState -> DbStructure -> IO ()
-putDbStructure appState structure =
-  atomicWriteIORef (stateDbStructure appState) $ Just structure
+putDbStructure :: AppState -> Maybe DbStructure -> IO ()
+putDbStructure appState = atomicWriteIORef (stateDbStructure appState)

 getJsonDbS :: AppState -> IO ByteString
 getJsonDbS = readIORef . stateJsonDbS
@@ -113,11 +121,8 @@ getJsonDbS = readIORef . stateJsonDbS
 putJsonDbS :: AppState -> ByteString -> IO ()
 putJsonDbS appState = atomicWriteIORef (stateJsonDbS appState)

-getIsWorkerOn :: AppState -> IO Bool
-getIsWorkerOn = readIORef . stateIsWorkerOn
-
-putIsWorkerOn :: AppState -> Bool -> IO ()
-putIsWorkerOn = atomicWriteIORef . stateIsWorkerOn
+getWorkerSem :: AppState -> MVar ()
+getWorkerSem = stateWorkerSem

 getRetryNextIn :: AppState -> IO Int
 getRetryNextIn = readIORef . stateRetryNextIn
@@ -153,3 +158,9 @@ waitListener = takeMVar . stateListener
 -- the connectionWorker is the only mvar producer.
 signalListener :: AppState -> IO ()
 signalListener appState = void $ tryPutMVar (stateListener appState) ()
+
+getIsListenerOn :: AppState -> IO Bool
+getIsListenerOn = readIORef . stateIsListenerOn
+
+putIsListenerOn :: AppState -> Bool -> IO ()
+putIsListenerOn = atomicWriteIORef . stateIsListenerOn
@@ -12,40 +12,55 @@ very simple authentication system inside the PostgreSQL database.
 -}
 {-# LANGUAGE RecordWildCards #-}
 module PostgREST.Auth
-  ( containsRole
-  , jwtClaims
-  , JWTClaims
+  ( AuthResult (..)
+  , getResult
+  , getRole
+  , middleware
  ) where

-import qualified Crypto.JWT          as JWT
-import qualified Data.Aeson          as JSON
-import qualified Data.HashMap.Strict as M
-import qualified Data.Vector         as V
+import qualified Crypto.JWT                      as JWT
+import qualified Data.Aeson                      as JSON
+import qualified Data.Aeson.Key                  as K
+import qualified Data.Aeson.KeyMap               as KM
+import qualified Data.Aeson.Types                as JSON
+import qualified Data.ByteString.Lazy.Char8      as LBS
+import qualified Data.Text.Encoding              as T
+import qualified Data.Vault.Lazy                 as Vault
+import qualified Data.Vector                     as V
+import qualified Network.HTTP.Types.Header       as HTTP
+import qualified Network.Wai                     as Wai
+import qualified Network.Wai.Middleware.HttpAuth as Wai

 import Control.Lens            (set)
 import Control.Monad.Except    (liftEither)
 import Data.Either.Combinators (mapLeft)
+import Data.List               (lookup)
 import Data.Time.Clock         (UTCTime)
+import System.IO.Unsafe        (unsafePerformIO)

-import PostgREST.Config (AppConfig (..), JSPath, JSPathExp (..))
-import PostgREST.Error  (Error (..))
+import PostgREST.AppState (AppState, getConfig, getTime)
+import PostgREST.Config   (AppConfig (..), JSPath, JSPathExp (..))
+import PostgREST.Error    (Error (..))

 import Protolude


-type JWTClaims = M.HashMap Text JSON.Value
+data AuthResult = AuthResult
+  { authClaims :: KM.KeyMap JSON.Value
+  , authRole   :: Text
+  }

 -- | Receives the JWT secret and audience (from config) and a JWT and returns a
-- map of JWT claims.
-jwtClaims :: Monad m =>
-  AppConfig -> LByteString -> UTCTime -> ExceptT Error m JWTClaims
-jwtClaims _ "" _ = return M.empty
-jwtClaims AppConfig{..} payload time = do
+-- JSON object of JWT claims.
+parseToken :: Monad m =>
+  AppConfig -> LByteString -> UTCTime -> ExceptT Error m JSON.Value
+parseToken _ "" _ = return JSON.emptyObject
+parseToken AppConfig{..} token time = do
  secret <- liftEither . maybeToRight JwtTokenMissing $ configJWKS
  eitherClaims <-
    lift . runExceptT $
-      JWT.verifyClaimsAt validation secret time =<< JWT.decodeCompact payload
-  liftEither . mapLeft jwtClaimsError $ claimsMap configJwtRoleClaimKey <$> eitherClaims
+      JWT.verifyClaimsAt validation secret time =<< JWT.decodeCompact token
+  liftEither . mapLeft jwtClaimsError $ JSON.toJSON <$> eitherClaims
  where
    validation =
      JWT.defaultJWTValidationSettings audienceCheck & set JWT.allowedSkew 1
@@ -57,26 +72,50 @@ jwtClaims AppConfig{..} payload time = do
    jwtClaimsError JWT.JWTExpired = JwtTokenInvalid "JWT expired"
    jwtClaimsError e              = JwtTokenInvalid $ show e

-- | Turn JWT ClaimSet into something easier to work with.
--
-- Also, here the jspath is applied to put the "role" in the map.
-claimsMap :: JSPath -> JWT.ClaimsSet -> JWTClaims
-claimsMap jspath claims =
-  case JSON.toJSON claims of
-    val@(JSON.Object o) ->
-      M.delete "role" o `M.union` role val
-    _ ->
-      M.empty
+parseClaims :: Monad m =>
+  AppConfig -> JSON.Value -> ExceptT Error m AuthResult
+parseClaims AppConfig{..} jclaims@(JSON.Object mclaims) = do
+  -- role defaults to anon if not specified in jwt
+  role <- liftEither . maybeToRight JwtTokenRequired $
+    unquoted <$> walkJSPath (Just jclaims) configJwtRoleClaimKey <|> configDbAnonRole
+  return AuthResult
+           { authClaims = mclaims & KM.insert "role" (JSON.toJSON role)
+           , authRole = role
+           }
  where
-    role value =
-      maybe M.empty (M.singleton "role") $ walkJSPath (Just value) jspath
-
    walkJSPath :: Maybe JSON.Value -> JSPath -> Maybe JSON.Value
    walkJSPath x                      []                = x
-    walkJSPath (Just (JSON.Object o)) (JSPKey key:rest) = walkJSPath (M.lookup key o) rest
+    walkJSPath (Just (JSON.Object o)) (JSPKey key:rest) = walkJSPath (KM.lookup (K.fromText key) o) rest
    walkJSPath (Just (JSON.Array ar)) (JSPIdx idx:rest) = walkJSPath (ar V.!? idx) rest
    walkJSPath _                      _                 = Nothing

-- | Whether a response from jwtClaims contains a role claim
-containsRole :: JWTClaims -> Bool
-containsRole = M.member "role"
+    unquoted :: JSON.Value -> Text
+    unquoted (JSON.String t) = t
+    unquoted v = T.decodeUtf8 . LBS.toStrict $ JSON.encode v
+-- impossible case - just added to please -Wincomplete-patterns
+parseClaims _ _ = return AuthResult { authClaims = KM.empty, authRole = mempty }
+
+-- | Validate authorization header.
+--   Parse and store JWT claims for future use in the request.
+middleware :: AppState -> Wai.Middleware
+middleware appState app req respond = do
+  conf <- getConfig appState
+  time <- getTime appState
+
+  let token = fromMaybe "" $ Wai.extractBearerAuth =<< lookup HTTP.hAuthorization (Wai.requestHeaders req)
+  authResult <- runExceptT $
+    parseToken conf (LBS.fromStrict token) time >>=
+    parseClaims conf
+
+  let req' = req { Wai.vault = Wai.vault req & Vault.insert authResultKey authResult }
+  app req' respond
+
+authResultKey :: Vault.Key (Either Error AuthResult)
+authResultKey = unsafePerformIO Vault.newKey
+{-# NOINLINE authResultKey #-}
+
+getResult :: Wai.Request -> Maybe (Either Error AuthResult)
+getResult = Vault.lookup authResultKey . Wai.vault
+
+getRole :: Wai.Request -> Maybe Text
+getRole req = authRole <$> (rightToMaybe =<< getResult req)
@@ -11,7 +11,6 @@ module PostgREST.CLI
 import qualified Data.Aeson                 as JSON
 import qualified Data.ByteString.Char8      as BS
 import qualified Data.ByteString.Lazy       as LBS
-import qualified Hasql.Pool                 as SQL
 import qualified Hasql.Transaction.Sessions as SQL
 import qualified Options.Applicative        as O

@@ -35,35 +34,32 @@ main :: App.SignalHandlerInstaller -> Maybe App.SocketRunner -> CLI -> IO ()
 main installSignalHandlers runAppWithSocket CLI{cliCommand, cliPath} = do
  conf@AppConfig{..} <-
    either panic identity <$> Config.readAppConfig mempty cliPath Nothing
-  appState <- AppState.init conf

-  -- Override the config with config options from the db
-  -- TODO: the same operation is repeated on connectionWorker, ideally this
-  -- would be done only once, but dump CmdDumpConfig needs it for tests.
-  when configDbConfig $ reReadConfig True appState
-
-  exec cliCommand appState
-  where
-    exec :: Command -> AppState -> IO ()
-    exec CmdDumpConfig appState = putStr . Config.toText =<< AppState.getConfig appState
-    exec CmdDumpSchema appState = putStrLn =<< dumpSchema appState
-    exec CmdRun appState = App.run installSignalHandlers runAppWithSocket appState
+  -- Per https://github.com/PostgREST/postgrest/issues/268, we want to
+  -- explicitly close the connections to PostgreSQL on shutdown.
+  -- 'AppState.destroy' takes care of that.
+  bracket
+    (AppState.init conf)
+    AppState.destroy
+    (\appState -> case cliCommand of
+      CmdDumpConfig -> do
+        when configDbConfig $ reReadConfig True appState
+        putStr . Config.toText =<< AppState.getConfig appState
+      CmdDumpSchema -> putStrLn =<< dumpSchema appState
+      CmdRun -> App.run installSignalHandlers runAppWithSocket appState)

 -- | Dump DbStructure schema to JSON
 dumpSchema :: AppState -> IO LBS.ByteString
 dumpSchema appState = do
  AppConfig{..} <- AppState.getConfig appState
-  actualPgVersion <- AppState.getPgVersion appState
  result <-
    let transaction = if configDbPreparedStatements then SQL.transaction else SQL.unpreparedTransaction in
-    SQL.use (AppState.getPool appState) $
+    AppState.usePool appState $
      transaction SQL.ReadCommitted SQL.Read $
        queryDbStructure
          (toList configDbSchemas)
          configDbExtraSearchPath
-          actualPgVersion
          configDbPreparedStatements
-  SQL.release $ AppState.getPool appState
  case result of
    Left e -> do
      hPutStrLn stderr $ "An error ocurred when loading the schema cache:\n" <> show e
@@ -82,12 +78,12 @@ data Command
  | CmdDumpSchema

 -- | Read command line interface options. Also prints help.
-readCLIShowHelp :: Bool -> IO CLI
-readCLIShowHelp hasEnvironment =
+readCLIShowHelp :: IO CLI
+readCLIShowHelp =
  O.customExecParser prefs opts
  where
    prefs = O.prefs $ O.showHelpOnError <> O.showHelpOnEmpty
-    opts = O.info parser $ O.fullDesc <> progDesc <> footer
+    opts = O.info parser $ O.fullDesc <> progDesc
    parser = O.helper <*> exampleParser <*> cliParser

    progDesc =
@@ -96,11 +92,6 @@ readCLIShowHelp hasEnvironment =
        <> BS.unpack prettyVersion
        <> " / create a REST API to an existing Postgres database"

-    footer =
-      O.footer $
-        "To run PostgREST, please pass the FILENAME argument"
-        <> " or set PGRST_ environment variables."
-
    exampleParser =
      O.infoOption exampleConfigFile $
        O.long "example"
@@ -111,12 +102,12 @@ readCLIShowHelp hasEnvironment =
    cliParser =
      CLI
        <$> (dumpConfigFlag <|> dumpSchemaFlag)
-        <*> optionalIf hasEnvironment configFileOption
+        <*> O.optional configFileOption

    configFileOption =
      O.strArgument $
        O.metavar "FILENAME"
-        <> O.help "Path to configuration file (optional with PGRST_ environment variables)"
+        <> O.help "Path to configuration file"

    dumpConfigFlag =
      O.flag CmdRun CmdDumpConfig $
@@ -128,36 +119,13 @@ readCLIShowHelp hasEnvironment =
        O.long "dump-schema"
        <> O.help "Dump loaded schema as JSON and exit (for debugging, output structure is unstable)"

-    optionalIf :: Alternative f => Bool -> f a -> f (Maybe a)
-    optionalIf True  = O.optional
-    optionalIf False = fmap Just
-
 exampleConfigFile :: [Char]
 exampleConfigFile =
-  [str|### REQUIRED:
-      |db-uri = "postgres://user:pass@localhost:5432/dbname"
-      |db-schema = "public"
-      |db-anon-role = "postgres"
+  [str|## Admin server used for checks. It's disabled by default unless a port is specified.
+      |# admin-server-port = 3001
      |
-      |### OPTIONAL:
-      |## number of open connections in the pool
-      |db-pool = 10
-      |
-      |## Time to live, in seconds, for an idle database pool connection.
-      |db-pool-timeout = 10
-      |
-      |## extra schemas to add to the search_path of every request
-      |db-extra-search-path = "public"
-      |
-      |## limit rows in response
-      |# db-max-rows = 1000
-      |
-      |## stored proc to exec immediately after auth
-      |# db-pre-request = "stored_proc_name"
-      |
-      |## stored proc that overrides the root "/" spec
-      |## it must be inside the db-schema
-      |# db-root-spec = "stored_proc_name"
+      |## The database role to use when no client authentication is provided
+      |# db-anon-role = "anon"
      |
      |## Notification channel for reloading the schema cache
      |db-channel = "pgrst"
@@ -168,56 +136,82 @@ exampleConfigFile =
      |## Enable in-database configuration
      |db-config = true
      |
+      |## Extra schemas to add to the search_path of every request
+      |db-extra-search-path = "public"
+      |
+      |## Limit rows in response
+      |# db-max-rows = 1000
+      |
+      |## Allow getting the EXPLAIN plan through the `Accept: application/vnd.pgrst.plan` header
+      |# db-plan-enabled = false
+      |
+      |## Number of open connections in the pool
+      |db-pool = 10
+      |
+      |## Time to live, in seconds, for an idle database pool connection
+      |db-pool-timeout = 3600
+      |
+      |## Stored proc to exec immediately after auth
+      |# db-pre-request = "stored_proc_name"
+      |
+      |## Enable or disable prepared statements. disabling is only necessary when behind a connection pooler.
+      |## When disabled, statements will be parametrized but won't be prepared.
+      |db-prepared-statements = true
+      |
+      |## The name of which database schema to expose to REST clients
+      |db-schemas = "public"
+      |
+      |## How to terminate database transactions
+      |## Possible values are:
+      |## commit (default)
+      |##   Transaction is always committed, this can not be overriden
+      |## commit-allow-override
+      |##   Transaction is committed, but can be overriden with Prefer tx=rollback header
+      |## rollback
+      |##   Transaction is always rolled back, this can not be overriden
+      |## rollback-allow-override
+      |##   Transaction is rolled back, but can be overriden with Prefer tx=commit header
+      |db-tx-end = "commit"
+      |
+      |## The standard connection URI format, documented at
+      |## https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-CONNSTRING
+      |db-uri = "postgresql://"
+      |
      |## Determine if GUC request settings for headers, cookies and jwt claims use the legacy names (string with dashes, invalid starting from PostgreSQL v14) with text values instead of the new names (string without dashes, valid on all PostgreSQL versions) with json values.
      |## For PostgreSQL v14 and up, this setting will be ignored.
      |db-use-legacy-gucs = true
      |
-      |## how to terminate database transactions
-      |## possible values are:
-      |## commit (default)
-      |##   transaction is always committed, this can not be overriden
-      |## commit-allow-override
-      |##   transaction is committed, but can be overriden with Prefer tx=rollback header
-      |## rollback
-      |##   transaction is always rolled back, this can not be overriden
-      |## rollback-allow-override
-      |##   transaction is rolled back, but can be overriden with Prefer tx=commit header
-      |db-tx-end = "commit"
+      |# jwt-aud = "your_audience_claim"
      |
-      |## enable or disable prepared statements. disabling is only necessary when behind a connection pooler.
-      |## when disabled, statements will be parametrized but won't be prepared.
-      |db-prepared-statements = true
+      |## Jspath to the role claim key
+      |jwt-role-claim-key = ".role"
+      |
+      |## Choose a secret, JSON Web Key (or set) to enable JWT auth
+      |## (use "@filename" to load from separate file)
+      |# jwt-secret = "secret_with_at_least_32_characters"
+      |jwt-secret-is-base64 = false
+      |
+      |## Logging level, the admitted values are: crit, error, warn and info.
+      |log-level = "error"
+      |
+      |## Determine if the OpenAPI output should follow or ignore role privileges or be disabled entirely.
+      |## Admitted values: follow-privileges, ignore-privileges, disabled
+      |openapi-mode = "follow-privileges"
+      |
+      |## Base url for the OpenAPI output
+      |openapi-server-proxy-uri = ""
+      |
+      |## Content types to produce raw output
+      |# raw-media-types="image/png, image/jpg"
      |
      |server-host = "!4"
      |server-port = 3000
      |
-      |## unix socket location
+      |## Unix socket location
      |## if specified it takes precedence over server-port
      |# server-unix-socket = "/tmp/pgrst.sock"
      |
-      |## unix socket file mode
-      |## when none is provided, 660 is applied by default
+      |## Unix socket file mode
+      |## When none is provided, 660 is applied by default
      |# server-unix-socket-mode = "660"
-      |
-      |## determine if the OpenAPI output should follow or ignore role privileges or be disabled entirely
-      |## admitted values: follow-privileges, ignore-privileges, disabled
-      |openapi-mode = "follow-privileges"
-      |
-      |## base url for the OpenAPI output
-      |openapi-server-proxy-uri = ""
-      |
-      |## choose a secret, JSON Web Key (or set) to enable JWT auth
-      |## (use "@filename" to load from separate file)
-      |# jwt-secret = "secret_with_at_least_32_characters"
-      |# jwt-aud = "your_audience_claim"
-      |jwt-secret-is-base64 = false
-      |
-      |## jspath to the role claim key
-      |jwt-role-claim-key = ".role"
-      |
-      |## content types to produce raw output
-      |# raw-media-types="image/png, image/jpg"
-      |
-      |## logging level, the admitted values are: crit, error, warn and info.
-      |log-level = "error"
      |]
@@ -57,17 +57,19 @@ import PostgREST.Config.Proxy            (Proxy (..),
                                          isMalformedProxyUri, toURI)
 import PostgREST.DbStructure.Identifiers (QualifiedIdentifier, dumpQi,
                                          toQi)
+import PostgREST.MediaType               (MediaType (..), toMime)

 import Protolude hiding (Proxy, toList)


 data AppConfig = AppConfig
  { configAppSettings           :: [(Text, Text)]
-  , configDbAnonRole            :: Text
+  , configDbAnonRole            :: Maybe Text
  , configDbChannel             :: Text
  , configDbChannelEnabled      :: Bool
  , configDbExtraSearchPath     :: [Text]
  , configDbMaxRows             :: Maybe Integer
+  , configDbPlanEnabled         :: Bool
  , configDbPoolSize            :: Int
  , configDbPoolTimeout         :: NominalDiffTime
  , configDbPreRequest          :: Maybe QualifiedIdentifier
@@ -87,12 +89,14 @@ data AppConfig = AppConfig
  , configJwtSecretIsBase64     :: Bool
  , configLogLevel              :: LogLevel
  , configOpenApiMode           :: OpenAPIMode
+  , configOpenApiSecurityActive :: Bool
  , configOpenApiServerProxyUri :: Maybe Text
-  , configRawMediaTypes         :: [BS.ByteString]
+  , configRawMediaTypes         :: [MediaType]
  , configServerHost            :: Text
  , configServerPort            :: Int
  , configServerUnixSocket      :: Maybe FilePath
  , configServerUnixSocketMode  :: FileMode
+  , configAdminServerPort       :: Maybe Int
  }

 data LogLevel = LogCrit | LogError | LogWarn | LogInfo
@@ -120,18 +124,19 @@ toText conf =
  where
    -- apply conf to all pgrst settings
    pgrstSettings = (\(k, v) -> (k, v conf)) <$>
-      [("db-anon-role",              q . configDbAnonRole)
+      [("db-anon-role",              q . fromMaybe "" . configDbAnonRole)
      ,("db-channel",                q . configDbChannel)
      ,("db-channel-enabled",            T.toLower . show . configDbChannelEnabled)
      ,("db-extra-search-path",      q . T.intercalate "," . configDbExtraSearchPath)
      ,("db-max-rows",                   maybe "\"\"" show . configDbMaxRows)
+      ,("db-plan-enabled",               T.toLower . show . configDbPlanEnabled)
      ,("db-pool",                       show . configDbPoolSize)
      ,("db-pool-timeout",               show . floor . configDbPoolTimeout)
      ,("db-pre-request",            q . maybe mempty dumpQi . configDbPreRequest)
      ,("db-prepared-statements",        T.toLower . show . configDbPreparedStatements)
      ,("db-root-spec",              q . maybe mempty dumpQi . configDbRootSpec)
      ,("db-schemas",                q . T.intercalate "," . toList . configDbSchemas)
-      ,("db-config",                 q . T.toLower . show . configDbConfig)
+      ,("db-config",                     T.toLower . show . configDbConfig)
      ,("db-tx-end",                 q . showTxEnd)
      ,("db-uri",                    q . configDbUri)
      ,("db-use-legacy-gucs",            T.toLower . show . configDbUseLegacyGucs)
@@ -141,12 +146,14 @@ toText conf =
      ,("jwt-secret-is-base64",          T.toLower . show . configJwtSecretIsBase64)
      ,("log-level",                 q . dumpLogLevel . configLogLevel)
      ,("openapi-mode",              q . dumpOpenApiMode . configOpenApiMode)
+      ,("openapi-security-active",       T.toLower . show . configOpenApiSecurityActive)
      ,("openapi-server-proxy-uri",  q . fromMaybe mempty . configOpenApiServerProxyUri)
-      ,("raw-media-types",           q . T.decodeUtf8 . BS.intercalate "," . configRawMediaTypes)
+      ,("raw-media-types",           q . T.decodeUtf8 . BS.intercalate "," . fmap toMime . configRawMediaTypes)
      ,("server-host",               q . configServerHost)
      ,("server-port",                   show . configServerPort)
      ,("server-unix-socket",        q . maybe mempty T.pack . configServerUnixSocket)
      ,("server-unix-socket-mode",   q . T.pack . showSocketMode)
+      ,("admin-server-port",             maybe "\"\"" show . configAdminServerPort)
      ]

    -- quote all app.settings
@@ -173,10 +180,10 @@ class JustIfMaybe a b where
  justIfMaybe :: a -> b

 instance JustIfMaybe a a where
-  justIfMaybe a = a
+  justIfMaybe = identity

 instance JustIfMaybe a (Maybe a) where
-  justIfMaybe a = Just a
+  justIfMaybe = Just

 -- | Reads and parses the config and overrides its parameters from env vars,
 -- files or db settings.
@@ -205,26 +212,26 @@ parser :: Maybe FilePath -> Environment -> [(Text, Text)] -> C.Parser C.Config A
 parser optPath env dbSettings =
  AppConfig
    <$> parseAppSettings "app.settings"
-    <*> reqString "db-anon-role"
+    <*> optString "db-anon-role"
    <*> (fromMaybe "pgrst" <$> optString "db-channel")
    <*> (fromMaybe True <$> optBool "db-channel-enabled")
    <*> (maybe ["public"] splitOnCommas <$> optValue "db-extra-search-path")
    <*> optWithAlias (optInt "db-max-rows")
                     (optInt "max-rows")
+    <*> (fromMaybe False <$> optBool "db-plan-enabled")
    <*> (fromMaybe 10 <$> optInt "db-pool")
-    <*> (fromIntegral . fromMaybe 10 <$> optInt "db-pool-timeout")
+    <*> (fromIntegral . fromMaybe 3600 <$> optInt "db-pool-timeout")
    <*> (fmap toQi <$> optWithAlias (optString "db-pre-request")
                                    (optString "pre-request"))
    <*> (fromMaybe True <$> optBool "db-prepared-statements")
    <*> (fmap toQi <$> optWithAlias (optString "db-root-spec")
                                    (optString "root-spec"))
-    <*> (fromList . splitOnCommas <$> reqWithAlias (optValue "db-schemas")
-                                                   (optValue "db-schema")
-                                                   "missing key: either db-schemas or db-schema must be set")
+    <*> (fromList . maybe ["public"] splitOnCommas <$> optWithAlias (optValue "db-schemas")
+                                                                    (optValue "db-schema"))
    <*> (fromMaybe True <$> optBool "db-config")
    <*> parseTxEnd "db-tx-end" snd
    <*> parseTxEnd "db-tx-end" fst
-    <*> reqString "db-uri"
+    <*> (fromMaybe "postgresql://" <$> optString "db-uri")
    <*> (fromMaybe True <$> optBool "db-use-legacy-gucs")
    <*> pure optPath
    <*> pure Nothing
@@ -236,12 +243,14 @@ parser optPath env dbSettings =
          (optBool "secret-is-base64"))
    <*> parseLogLevel "log-level"
    <*> parseOpenAPIMode "openapi-mode"
+    <*> (fromMaybe False <$> optBool "openapi-security-active")
    <*> parseOpenAPIServerProxyURI "openapi-server-proxy-uri"
-    <*> (maybe [] (fmap encodeUtf8 . splitOnCommas) <$> optValue "raw-media-types")
+    <*> (maybe [] (fmap (MTOther . encodeUtf8) . splitOnCommas) <$> optValue "raw-media-types")
    <*> (fromMaybe "!4" <$> optString "server-host")
    <*> (fromMaybe 3000 <$> optInt "server-port")
    <*> (fmap T.unpack <$> optString "server-unix-socket")
    <*> parseSocketFileMode "server-unix-socket-mode"
+    <*> optInt "admin-server-port"
  where
    parseAppSettings :: C.Key -> C.Parser C.Config [(Text, Text)]
    parseAppSettings key = addFromEnv . fmap (fmap coerceText) <$> C.subassocs key C.value
@@ -314,24 +323,12 @@ parser optPath env dbSettings =
        Nothing  -> pure [JSPKey "role"]
        Just rck -> either (fail . show) pure $ pRoleClaimKey rck

-    reqWithAlias :: C.Parser C.Config (Maybe a) -> C.Parser C.Config (Maybe a) -> [Char] -> C.Parser C.Config a
-    reqWithAlias orig alias err =
-      orig >>= \case
-        Just v  -> pure v
-        Nothing ->
-          alias >>= \case
-            Just v  -> pure v
-            Nothing -> fail err
-
    optWithAlias :: C.Parser C.Config (Maybe a) -> C.Parser C.Config (Maybe a) -> C.Parser C.Config (Maybe a)
    optWithAlias orig alias =
      orig >>= \case
        Just v  -> pure $ Just v
        Nothing -> alias

-    reqString :: C.Key -> C.Parser C.Config Text
-    reqString k = overrideFromDbOrEnvironment C.required k coerceText
-
    optString :: C.Key -> C.Parser C.Config (Maybe Text)
    optString k = mfilter (/= "") <$> overrideFromDbOrEnvironment C.optional k coerceText

@@ -358,8 +355,8 @@ parser optPath env dbSettings =
        reloadableDbSetting =
          let dbSettingName = T.pack $ dashToUnderscore <$> toS key in
          if dbSettingName `notElem` [
-            "server_host", "server_port", "server_unix_socket", "server_unix_socket_mode", "log_level",
-            "db_anon_role", "db_uri", "db_channel_enabled", "db_channel", "db_pool", "db_pool_timeout", "db_config"]
+            "server_host", "server_port", "server_unix_socket", "server_unix_socket_mode", "admin_server_port", "log_level",
+            "db_uri", "db_channel_enabled", "db_channel", "db_pool", "db_pool_timeout", "db_config"]
          then lookup dbSettingName dbSettings
          else Nothing

@@ -369,17 +366,17 @@ parser optPath env dbSettings =

    coerceInt :: (Read i, Integral i) => C.Value -> Maybe i
    coerceInt (C.Number x) = rightToMaybe $ floatingOrInteger x
-    coerceInt (C.String x) = readMaybe $ toS x
+    coerceInt (C.String x) = readMaybe x
    coerceInt _            = Nothing

    coerceBool :: C.Value -> Maybe Bool
    coerceBool (C.Bool b)   = Just b
    coerceBool (C.String s) =
      -- parse all kinds of text: True, true, TRUE, "true", ...
-      case readMaybe . toS $ T.toTitle $ T.filter isAlpha $ toS s of
+      case readMaybe $ T.toTitle $ T.filter isAlpha $ toS s of
        Just b  -> Just b
        -- numeric instead?
-        Nothing -> (> 0) <$> (readMaybe $ toS s :: Maybe Integer)
+        Nothing -> (> 0) <$> (readMaybe s :: Maybe Integer)
    coerceBool _            = Nothing

    splitOnCommas :: C.Value -> [Text]
@@ -1,7 +1,8 @@
 {-# LANGUAGE QuasiQuotes #-}

 module PostgREST.Config.Database
-  ( queryDbSettings
+  ( pgVersionStatement
+  , queryDbSettings
  , queryPgVersion
  ) where

@@ -9,7 +10,6 @@ import PostgREST.Config.PgVersion (PgVersion (..))

 import qualified Hasql.Decoders             as HD
 import qualified Hasql.Encoders             as HE
-import qualified Hasql.Pool                 as SQL
 import           Hasql.Session              (Session, statement)
 import qualified Hasql.Statement            as SQL
 import qualified Hasql.Transaction          as SQL
@@ -20,35 +20,44 @@ import Text.InterpolatedString.Perl6 (q)
 import Protolude

 queryPgVersion :: Session PgVersion
-queryPgVersion = statement mempty $ SQL.Statement sql HE.noParams versionRow False
+queryPgVersion = statement mempty pgVersionStatement
+
+pgVersionStatement :: SQL.Statement () PgVersion
+pgVersionStatement = SQL.Statement sql HE.noParams versionRow False
  where
    sql = "SELECT current_setting('server_version_num')::integer, current_setting('server_version')"
    versionRow = HD.singleRow $ PgVersion <$> column HD.int4 <*> column HD.text

-queryDbSettings :: SQL.Pool -> Bool -> IO (Either SQL.UsageError [(Text, Text)])
-queryDbSettings pool prepared =
+queryDbSettings :: Bool -> Session [(Text, Text)]
+queryDbSettings prepared =
  let transaction = if prepared then SQL.transaction else SQL.unpreparedTransaction in
-  SQL.use pool . transaction SQL.ReadCommitted SQL.Read $
-    SQL.statement mempty dbSettingsStatement
+  transaction SQL.ReadCommitted SQL.Read $ SQL.statement mempty dbSettingsStatement

 -- | Get db settings from the connection role. Global settings will be overridden by database specific settings.
 dbSettingsStatement :: SQL.Statement () [(Text, Text)]
 dbSettingsStatement = SQL.Statement sql HE.noParams decodeSettings False
  where
    sql = [q|
-      with
-      role_setting as (
-        select setdatabase, unnest(setconfig) as setting from pg_catalog.pg_db_role_setting
-        where setrole = current_user::regrole::oid
-          and setdatabase in (0, (select oid from pg_catalog.pg_database where datname = current_catalog))
+      WITH
+      role_setting (database, setting) AS (
+        SELECT setdatabase,
+               unnest(setconfig)
+          FROM pg_catalog.pg_db_role_setting
+         WHERE setrole = CURRENT_USER::regrole::oid
+           AND setdatabase IN (0, (SELECT oid FROM pg_catalog.pg_database WHERE datname = CURRENT_CATALOG))
      ),
-      kv_settings as (
-        select setdatabase, split_part(setting, '=', 1) as k, split_part(setting, '=', 2) as value from role_setting
-        where setting like 'pgrst.%'
+      kv_settings (database, k, v) AS (
+        SELECT database,
+               substr(setting, 1, strpos(setting, '=') - 1),
+               substr(setting, strpos(setting, '=') + 1)
+          FROM role_setting
+         WHERE setting LIKE 'pgrst.%'
      )
-      select distinct on (key) replace(k, 'pgrst.', '') as key, value
-      from kv_settings
-      order by key, setdatabase desc;
+      SELECT DISTINCT ON (key)
+             replace(k, 'pgrst.', '') AS key,
+             v AS value
+        FROM kv_settings
+       ORDER BY key, database DESC;
    |]
    decodeSettings = HD.rowList $ (,) <$> column HD.text <*> column HD.text

@@ -9,6 +9,7 @@ module PostgREST.Config.PgVersion
  , pgVersion110
  , pgVersion112
  , pgVersion114
+  , pgVersion120
  , pgVersion121
  , pgVersion130
  , pgVersion140
@@ -50,6 +51,9 @@ pgVersion112 = PgVersion 110002 "11.2"
 pgVersion114 :: PgVersion
 pgVersion114 = PgVersion 110004 "11.4"

+pgVersion120 :: PgVersion
+pgVersion120 = PgVersion 120000 "12.0"
+
 pgVersion121 :: PgVersion
 pgVersion121 = PgVersion 120001 "12.1"

@@ -1,64 +0,0 @@
-{-# LANGUAGE DuplicateRecordFields #-}
-
-module PostgREST.ContentType
-  ( ContentType(..)
-  , toHeader
-  , toMime
-  , decodeContentType
-  ) where
-
-import qualified Data.ByteString          as BS
-import qualified Data.ByteString.Internal as BS (c2w)
-
-import Network.HTTP.Types.Header (Header, hContentType)
-
-import Protolude
-
-- | Enumeration of currently supported response content types
-data ContentType
-  = CTApplicationJSON
-  | CTSingularJSON
-  | CTTextCSV
-  | CTTextPlain
-  | CTOpenAPI
-  | CTUrlEncoded
-  | CTOctetStream
-  | CTAny
-  | CTOther ByteString
-  deriving (Eq)
-
-- | Convert from ContentType to a full HTTP Header
-toHeader :: ContentType -> Header
-toHeader ct = (hContentType, toMime ct <> charset)
-  where
-    charset = case ct of
-      CTOctetStream -> mempty
-      CTOther _     -> mempty
-      _             -> "; charset=utf-8"
-
-- | Convert from ContentType to a ByteString representing the mime type
-toMime :: ContentType -> ByteString
-toMime CTApplicationJSON = "application/json"
-toMime CTTextCSV         = "text/csv"
-toMime CTTextPlain       = "text/plain"
-toMime CTOpenAPI         = "application/openapi+json"
-toMime CTSingularJSON    = "application/vnd.pgrst.object+json"
-toMime CTUrlEncoded      = "application/x-www-form-urlencoded"
-toMime CTOctetStream     = "application/octet-stream"
-toMime CTAny             = "*/*"
-toMime (CTOther ct)      = ct
-
-- | Convert from ByteString to ContentType. Warning: discards MIME parameters
-decodeContentType :: BS.ByteString -> ContentType
-decodeContentType ct =
-  case BS.takeWhile (/= BS.c2w ';') ct of
-    "application/json"                  -> CTApplicationJSON
-    "text/csv"                          -> CTTextCSV
-    "text/plain"                        -> CTTextPlain
-    "application/openapi+json"          -> CTOpenAPI
-    "application/vnd.pgrst.object+json" -> CTSingularJSON
-    "application/vnd.pgrst.object"      -> CTSingularJSON
-    "application/x-www-form-urlencoded" -> CTUrlEncoded
-    "application/octet-stream"          -> CTOctetStream
-    "*/*"                               -> CTAny
-    ct'                                 -> CTOther ct'
@@ -0,0 +1,42 @@
+{-|
+Module      : PostgREST.Cors
+Description : Wai Middleware to set cors policy.
+-}
+module PostgREST.Cors (middleware) where
+
+import qualified Data.ByteString.Char8       as BS
+import qualified Data.CaseInsensitive        as CI
+import qualified Network.Wai                 as Wai
+import qualified Network.Wai.Middleware.Cors as Wai
+
+import Data.List (lookup)
+
+import Protolude
+
+middleware :: Wai.Middleware
+middleware = Wai.cors corsPolicy
+
+-- | CORS policy to be used in by Wai Cors middleware
+corsPolicy :: Wai.Request -> Maybe Wai.CorsResourcePolicy
+corsPolicy req = case lookup "origin" headers of
+  Just origin ->
+    Just Wai.CorsResourcePolicy
+    { Wai.corsOrigins = Just ([origin], True)
+    , Wai.corsMethods = ["GET", "POST", "PATCH", "PUT", "DELETE", "OPTIONS"]
+    , Wai.corsRequestHeaders = "Authorization" : accHeaders
+    , Wai.corsExposedHeaders = Just
+      [ "Content-Encoding", "Content-Location", "Content-Range", "Content-Type"
+      , "Date", "Location", "Server", "Transfer-Encoding", "Range-Unit"]
+    , Wai.corsMaxAge = Just $ 60*60*24
+    , Wai.corsVaryOrigin = False
+    , Wai.corsRequireOrigin = False
+    , Wai.corsIgnoreFailures = True
+    }
+  Nothing -> Nothing
+  where
+    headers = Wai.requestHeaders req
+    accHeaders = case lookup "access-control-request-headers" headers of
+      Just hdrs -> map (CI.mk . BS.strip) $ BS.split ',' hdrs
+       -- Impossible case, Middleware.Cors will not evaluate this when
+       -- the Access-Control-Request-Headers header is not set.
+      Nothing   -> []
@@ -10,11 +10,12 @@ module PostgREST.DbStructure.Proc
  , RetType(..)
  , procReturnsScalar
  , procReturnsSingle
+  , procReturnsVoid
  , procTableName
  ) where

 import qualified Data.Aeson          as JSON
-import qualified Data.HashMap.Strict as M
+import qualified Data.HashMap.Strict as HM

 import PostgREST.DbStructure.Identifiers (QualifiedIdentifier (..),
                                          Schema, TableName)
@@ -42,7 +43,7 @@ data ProcDescription = ProcDescription
  , pdName        :: Text
  , pdDescription :: Maybe Text
  , pdParams      :: [ProcParam]
-  , pdReturnType  :: RetType
+  , pdReturnType  :: Maybe RetType
  , pdVolatility  :: ProcVolatility
  , pdHasVariadic :: Bool
  }
@@ -65,21 +66,26 @@ instance Ord ProcDescription where

 -- | A map of all procs, all of which can be overloaded(one entry will have more than one ProcDescription).
 -- | It uses a HashMap for a faster lookup.
-type ProcsMap = M.HashMap QualifiedIdentifier [ProcDescription]
+type ProcsMap = HM.HashMap QualifiedIdentifier [ProcDescription]

 procReturnsScalar :: ProcDescription -> Bool
 procReturnsScalar proc = case proc of
-  ProcDescription{pdReturnType = (Single Scalar)} -> True
-  ProcDescription{pdReturnType = (SetOf Scalar)}  -> True
-  _                                               -> False
+  ProcDescription{pdReturnType = Just (Single Scalar)} -> True
+  ProcDescription{pdReturnType = Just (SetOf Scalar)}  -> True
+  _                                                    -> False

 procReturnsSingle :: ProcDescription -> Bool
 procReturnsSingle proc = case proc of
-  ProcDescription{pdReturnType = (Single _)} -> True
-  _                                          -> False
+  ProcDescription{pdReturnType = Just (Single _)} -> True
+  _                                               -> False
+
+procReturnsVoid :: ProcDescription -> Bool
+procReturnsVoid proc = case proc of
+  ProcDescription{pdReturnType = Nothing} -> True
+  _                                       -> False

 procTableName :: ProcDescription -> Maybe TableName
 procTableName proc = case pdReturnType proc of
-  SetOf  (Composite qi) -> Just $ qiName qi
-  Single (Composite qi) -> Just $ qiName qi
-  _                     -> Nothing
+  Just (SetOf  (Composite qi)) -> Just $ qiName qi
+  Just (Single (Composite qi)) -> Just $ qiName qi
+  _                            -> Nothing
@@ -3,60 +3,62 @@

 module PostgREST.DbStructure.Relationship
  ( Cardinality(..)
-  , PrimaryKey(..)
  , Relationship(..)
  , Junction(..)
-  , isSelfReference
+  , RelationshipsMap
  ) where

-import qualified Data.Aeson as JSON
+import qualified Data.Aeson          as JSON
+import qualified Data.HashMap.Strict as HM

-import PostgREST.DbStructure.Table (Column (..), Table (..))
+import PostgREST.DbStructure.Identifiers (FieldName,
+                                          QualifiedIdentifier, Schema)

 import Protolude


 -- | Relationship between two tables.
--
-- The order of the relColumns and relForeignColumns should be maintained to get the
-- join conditions right.
--
-- TODO merge relColumns and relForeignColumns to a tuple or Data.Bimap
 data Relationship = Relationship
-  { relTable          :: Table
-  , relColumns        :: [Column]
-  , relForeignTable   :: Table
-  , relForeignColumns :: [Column]
-  , relCardinality    :: Cardinality
+  { relTable        :: QualifiedIdentifier
+  , relForeignTable :: QualifiedIdentifier
+  , relIsSelf       :: Bool -- ^ Whether is a self relationship
+  , relCardinality  :: Cardinality
+  , relTableIsView  :: Bool
+  , relFTableIsView :: Bool
  }
-  deriving (Eq, Generic, JSON.ToJSON)
+  | ComputedRelationship
+  { relFunction     :: QualifiedIdentifier
+  , relTable        :: QualifiedIdentifier
+  , relForeignTable :: QualifiedIdentifier
+  , relToOne        :: Bool
+  , relIsSelf       :: Bool
+  }
+  deriving (Eq, Ord, Generic, JSON.ToJSON)

 -- | The relationship cardinality
 -- | https://en.wikipedia.org/wiki/Cardinality_(data_modeling)
-- TODO: missing one-to-one
 data Cardinality
-  = O2M FKConstraint -- ^ one-to-many cardinality
-  | M2O FKConstraint -- ^ many-to-one cardinality
-  | M2M Junction     -- ^ many-to-many cardinality
-  deriving (Eq, Generic, JSON.ToJSON)
+  = O2M {relCons :: FKConstraint, relColumns :: [(FieldName, FieldName)]}
+  -- ^ one-to-many
+  | M2O {relCons :: FKConstraint, relColumns :: [(FieldName, FieldName)]}
+  -- ^ many-to-one
+  | O2O {relCons :: FKConstraint, relColumns :: [(FieldName, FieldName)]}
+  -- ^ one-to-one, this is a refinement over M2O so operating on it is pretty much the same as M2O
+  | M2M Junction
+  -- ^ many-to-many
+  deriving (Eq, Ord, Generic, JSON.ToJSON)

 type FKConstraint = Text

 -- | Junction table on an M2M relationship
 data Junction = Junction
-  { junTable       :: Table
+  { junTable       :: QualifiedIdentifier
  , junConstraint1 :: FKConstraint
-  , junColumns1    :: [Column]
  , junConstraint2 :: FKConstraint
-  , junColumns2    :: [Column]
+  , junColumns1    :: [(FieldName, FieldName)]
+  , junColumns2    :: [(FieldName, FieldName)]
  }
-  deriving (Eq, Generic, JSON.ToJSON)
+  deriving (Eq, Ord, Generic, JSON.ToJSON)

-isSelfReference :: Relationship -> Bool
-isSelfReference r = relTable r == relForeignTable r
-
-data PrimaryKey = PrimaryKey
-  { pkTable :: Table
-  , pkName  :: Text
-  }
-  deriving (Generic, JSON.ToJSON)
+-- | Key based on the source table and the foreign table schema
+type RelationshipsMap = HM.HashMap (QualifiedIdentifier, Schema)  [Relationship]
@@ -4,10 +4,11 @@
 module PostgREST.DbStructure.Table
  ( Column(..)
  , Table(..)
-  , tableQi
+  , TablesMap
  ) where

-import qualified Data.Aeson as JSON
+import qualified Data.Aeson          as JSON
+import qualified Data.HashMap.Strict as HM

 import PostgREST.DbStructure.Identifiers (FieldName,
                                          QualifiedIdentifier (..),
@@ -20,22 +21,22 @@ data Table = Table
  { tableSchema      :: Schema
  , tableName        :: TableName
  , tableDescription :: Maybe Text
+     -- TODO Find a better way to separate tables and views
+   , tableIsView     :: Bool
    -- The following fields identify what can be done on the table/view, they're not related to the privileges granted to it
  , tableInsertable  :: Bool
  , tableUpdatable   :: Bool
  , tableDeletable   :: Bool
+  , tablePKCols      :: [FieldName]
+  , tableColumns     :: [Column]
  }
  deriving (Show, Ord, Generic, JSON.ToJSON)

 instance Eq Table where
  Table{tableSchema=s1,tableName=n1} == Table{tableSchema=s2,tableName=n2} = s1 == s2 && n1 == n2

-tableQi :: Table -> QualifiedIdentifier
-tableQi Table{tableSchema=s, tableName=n} = QualifiedIdentifier s n
-
 data Column = Column
-  { colTable       :: Table
-  , colName        :: FieldName
+  { colName        :: FieldName
  , colDescription :: Maybe Text
  , colNullable    :: Bool
  , colType        :: Text
@@ -43,13 +44,6 @@ data Column = Column
  , colDefault     :: Maybe Text
  , colEnum        :: [Text]
  }
-  deriving (Ord, Generic, JSON.ToJSON)
+  deriving (Eq, Show, Ord, Generic, JSON.ToJSON)

-instance Eq Column where
-  Column{colTable=t1,colName=n1} == Column{colTable=t2,colName=n2} = t1 == t2 && n1 == n2
-
-data PrimaryKey = PrimaryKey
-  { pkTable :: Table
-  , pkName  :: Text
-  }
-  deriving (Generic, JSON.ToJSON)
+type TablesMap = HM.HashMap QualifiedIdentifier Table
@@ -29,16 +29,17 @@ import Network.Wai (Response, responseLBS)

 import Network.HTTP.Types.Header (Header)

-import           PostgREST.ContentType (ContentType (..))
-import qualified PostgREST.ContentType as ContentType
+import           PostgREST.MediaType     (MediaType (..))
+import qualified PostgREST.MediaType     as MediaType
+import           PostgREST.Request.Types (ApiRequestError (..),
+                                          QPError (..))

+import PostgREST.DbStructure.Identifiers  (QualifiedIdentifier (..))
 import PostgREST.DbStructure.Proc         (ProcDescription (..),
                                           ProcParam (..))
 import PostgREST.DbStructure.Relationship (Cardinality (..),
                                           Junction (..),
                                           Relationship (..))
-import PostgREST.DbStructure.Table        (Column (..), Table (..))
-
 import Protolude


@@ -52,108 +53,162 @@ class (JSON.ToJSON a) => PgrstError a where
  errorResponseFor :: a -> Response
  errorResponseFor err = responseLBS (status err) (headers err) $ errorPayload err

-
-
-data ApiRequestError
-  = ActionInappropriate
-  | InvalidRange
-  | InvalidBody ByteString
-  | ParseRequestError Text Text
-  | NoRelBetween Text Text
-  | AmbiguousRelBetween Text Text [Relationship]
-  | AmbiguousRpc [ProcDescription]
-  | NoRpc Text Text [Text] Bool ContentType Bool
-  | InvalidFilters
-  | UnacceptableSchema [Text]
-  | ContentTypeError [ByteString]
-  | UnsupportedVerb                -- Unreachable?
-
 instance PgrstError ApiRequestError where
-  status InvalidRange            = HTTP.status416
-  status InvalidFilters          = HTTP.status405
-  status (InvalidBody _)         = HTTP.status400
-  status UnsupportedVerb         = HTTP.status405
-  status ActionInappropriate     = HTTP.status405
-  status (ParseRequestError _ _) = HTTP.status400
-  status (NoRelBetween _ _)      = HTTP.status400
  status AmbiguousRelBetween{}   = HTTP.status300
-  status (AmbiguousRpc _)        = HTTP.status300
+  status AmbiguousRpc{}          = HTTP.status300
+  status MediaTypeError{}        = HTTP.status415
+  status InvalidBody{}           = HTTP.status400
+  status InvalidFilters          = HTTP.status405
+  status InvalidRpcMethod{}      = HTTP.status405
+  status InvalidRange            = HTTP.status416
+  status NotFound                = HTTP.status404
+  status NoRelBetween{}          = HTTP.status400
  status NoRpc{}                 = HTTP.status404
-  status (UnacceptableSchema _)  = HTTP.status406
-  status (ContentTypeError _)    = HTTP.status415
+  status NotEmbedded{}           = HTTP.status400
+  status ParseRequestError{}     = HTTP.status400
+  status PutRangeNotAllowedError = HTTP.status400
+  status QueryParamError{}       = HTTP.status400
+  status UnacceptableSchema{}    = HTTP.status406
+  status UnsupportedMethod{}     = HTTP.status405
+  status LimitNoOrderError       = HTTP.status400

-  headers _ = [ContentType.toHeader CTApplicationJSON]
+  headers _ = [MediaType.toContentType MTApplicationJSON]

 instance JSON.ToJSON ApiRequestError where
-  toJSON (ParseRequestError message details) = JSON.object [
-    "message" .= message, "details" .= details]
-  toJSON ActionInappropriate = JSON.object [
-    "message" .= ("Bad Request" :: Text)]
+  toJSON (QueryParamError (QPError message details)) = JSON.object [
+    "code"    .= ApiRequestErrorCode00,
+    "message" .= message,
+    "details" .= details,
+    "hint"    .= JSON.Null]
+  toJSON (InvalidRpcMethod method) = JSON.object [
+    "code"    .= ApiRequestErrorCode01,
+    "message" .= ("Cannot use the " <> T.decodeUtf8 method <> " method on RPC"),
+    "details" .= JSON.Null,
+    "hint"    .= JSON.Null]
  toJSON (InvalidBody errorMessage) = JSON.object [
-    "message" .= T.decodeUtf8 errorMessage]
+    "code"    .= ApiRequestErrorCode02,
+    "message" .= T.decodeUtf8 errorMessage,
+    "details" .= JSON.Null,
+    "hint"    .= JSON.Null]
  toJSON InvalidRange = JSON.object [
-    "message" .= ("HTTP Range error" :: Text)]
-  toJSON (NoRelBetween parent child) = JSON.object [
-    "hint"    .= ("If a new foreign key between these entities was created in the database, try reloading the schema cache." :: Text),
-    "message" .= ("Could not find a relationship between " <> parent <> " and " <> child <> " in the schema cache" :: Text)]
+    "code"    .= ApiRequestErrorCode03,
+    "message" .= ("HTTP Range error" :: Text),
+    "details" .= JSON.Null,
+    "hint"    .= JSON.Null]
+  toJSON (ParseRequestError message details) = JSON.object [
+    "code"    .= ApiRequestErrorCode04,
+    "message" .= message,
+    "details" .= details,
+    "hint"    .= JSON.Null]
+  toJSON InvalidFilters = JSON.object [
+    "code"    .= ApiRequestErrorCode05,
+    "message" .= ("Filters must include all and only primary key columns with 'eq' operators" :: Text),
+    "details" .= JSON.Null,
+    "hint"    .= JSON.Null]
+  toJSON (UnacceptableSchema schemas) = JSON.object [
+    "code"    .= ApiRequestErrorCode06,
+    "message" .= ("The schema must be one of the following: " <> T.intercalate ", " schemas),
+    "details" .= JSON.Null,
+    "hint"    .= JSON.Null]
+  toJSON (MediaTypeError cts)    = JSON.object [
+    "code"    .= ApiRequestErrorCode07,
+    "message" .= ("None of these media types are available: " <> T.intercalate ", " (map T.decodeUtf8 cts)),
+    "details" .= JSON.Null,
+    "hint"    .= JSON.Null]
+  toJSON NotFound = JSON.object []
+  toJSON (NotEmbedded resource) = JSON.object [
+    "code"    .= ApiRequestErrorCode08,
+    "message" .= ("Cannot apply filter because '" <> resource <> "' is not an embedded resource in this request" :: Text),
+    "details" .= JSON.Null,
+    "hint"    .= ("Verify that '" <> resource <> "' is included in the 'select' query parameter." :: Text)]
+
+  toJSON LimitNoOrderError = JSON.object [
+    "code"    .= ApiRequestErrorCode09,
+    "message" .= ("A 'limit' was applied without an explicit 'order'":: Text),
+    "details" .= JSON.Null,
+    "hint"    .= ("Apply an 'order' using unique column(s)" :: Text)]
+
+  toJSON PutRangeNotAllowedError = JSON.object [
+    "code"    .= ApiRequestErrorCode14,
+    "message" .= ("Range header and limit/offset querystring parameters are not allowed for PUT" :: Text),
+    "details" .= JSON.Null,
+    "hint"    .= JSON.Null]
+
+  toJSON (UnsupportedMethod method) = JSON.object [
+    "code"    .= ApiRequestErrorCode17,
+    "message" .= ("Unsupported HTTP method: " <> T.decodeUtf8 method),
+    "details" .= JSON.Null,
+    "hint"    .= JSON.Null]
+
+  toJSON (NoRelBetween parent child schema) = JSON.object [
+    "code"    .= SchemaCacheErrorCode00,
+    "message" .= ("Could not find a relationship between '" <> parent <> "' and '" <> child <> "' in the schema cache" :: Text),
+    "details" .= JSON.Null,
+    "hint"    .= ("Verify that '" <> parent <> "' and '" <> child <> "' exist in the schema '" <> schema <> "' and that there is a foreign key relationship between them. If a new relationship was created, try reloading the schema cache." :: Text)]
  toJSON (AmbiguousRelBetween parent child rels) = JSON.object [
-    "hint"    .= ("Try changing '" <> child <> "' to one of the following: " <> relHint rels <> ". Find the desired relationship in the 'details' key." :: Text),
+    "code"    .= SchemaCacheErrorCode01,
    "message" .= ("Could not embed because more than one relationship was found for '" <> parent <> "' and '" <> child <> "'" :: Text),
-    "details" .= (compressedRel <$> rels) ]
-  toJSON (AmbiguousRpc procs)  = JSON.object [
-    "hint"    .= ("Try renaming the parameters or the function itself in the database so function overloading can be resolved" :: Text),
-    "message" .= ("Could not choose the best candidate function between: " <> T.intercalate ", " [pdSchema p <> "." <> pdName p <> "(" <> T.intercalate ", " [ppName a <> " => " <> ppType a | a <- pdParams p] <> ")" | p <- procs])]
+    "details" .= (compressedRel <$> rels),
+    "hint"    .= ("Try changing '" <> child <> "' to one of the following: " <> relHint rels <> ". Find the desired relationship in the 'details' key." :: Text)]
  toJSON (NoRpc schema procName argumentKeys hasPreferSingleObject contentType isInvPost)  =
    let prms = "(" <> T.intercalate ", " argumentKeys <> ")" in JSON.object [
-    "hint"    .= ("If a new function was created in the database with this name and parameters, try reloading the schema cache." :: Text),
+    "code"    .= SchemaCacheErrorCode02,
    "message" .= ("Could not find the " <> schema <> "." <> procName <>
      (case (hasPreferSingleObject, isInvPost, contentType) of
        (True, _, _)                 -> " function with a single json or jsonb parameter"
-        (_, True, CTTextPlain)       -> " function with a single unnamed text parameter"
-        (_, True, CTOctetStream)     -> " function with a single unnamed bytea parameter"
-        (_, True, CTApplicationJSON) -> prms <> " function or the " <> schema <> "." <> procName <>" function with a single unnamed json or jsonb parameter"
+        (_, True, MTTextPlain)       -> " function with a single unnamed text parameter"
+        (_, True, MTTextXML)         -> " function with a single unnamed xml parameter"
+        (_, True, MTOctetStream)     -> " function with a single unnamed bytea parameter"
+        (_, True, MTApplicationJSON) -> prms <> " function or the " <> schema <> "." <> procName <>" function with a single unnamed json or jsonb parameter"
        _                            -> prms <> " function") <>
-      " in the schema cache")]
-  toJSON UnsupportedVerb = JSON.object [
-    "message" .= ("Unsupported HTTP verb" :: Text)]
-  toJSON InvalidFilters = JSON.object [
-    "message" .= ("Filters must include all and only primary key columns with 'eq' operators" :: Text)]
-  toJSON (UnacceptableSchema schemas) = JSON.object [
-    "message" .= ("The schema must be one of the following: " <> T.intercalate ", " schemas)]
-  toJSON (ContentTypeError cts)    = JSON.object [
-    "message" .= ("None of these Content-Types are available: " <> T.intercalate ", " (map T.decodeUtf8 cts))]
+      " in the schema cache"),
+    "details" .= JSON.Null,
+    "hint"    .= ("If a new function was created in the database with this name and parameters, try reloading the schema cache." :: Text)]
+  toJSON (AmbiguousRpc procs)  = JSON.object [
+    "code"    .= SchemaCacheErrorCode03,
+    "message" .= ("Could not choose the best candidate function between: " <> T.intercalate ", " [pdSchema p <> "." <> pdName p <> "(" <> T.intercalate ", " [ppName a <> " => " <> ppType a | a <- pdParams p] <> ")" | p <- procs]),
+    "details" .= JSON.Null,
+    "hint"    .= ("Try renaming the parameters or the function itself in the database so function overloading can be resolved" :: Text)]

 compressedRel :: Relationship -> JSON.Value
+-- An ambiguousness error cannot happen for computed relationships TODO refactor so this mempty is not needed
+compressedRel ComputedRelationship{} = JSON.object mempty
 compressedRel Relationship{..} =
  let
-    fmtTbl Table{..} = tableSchema <> "." <> tableName
-    fmtEls els = "[" <> T.intercalate ", " els <> "]"
+    fmtEls els = "(" <> T.intercalate ", " els <> ")"
  in
  JSON.object $
-    ("embedding" .= (tableName relTable <> " with " <> tableName relForeignTable :: Text))
+    ("embedding" .= (qiName relTable <> " with " <> qiName relForeignTable :: Text))
    : case relCardinality of
        M2M Junction{..} -> [
            "cardinality" .= ("many-to-many" :: Text)
-          , "relationship" .= (fmtTbl junTable <> fmtEls [junConstraint1] <> fmtEls [junConstraint2])
+          , "relationship" .= (qiName junTable <> " using " <> junConstraint1 <> fmtEls (snd <$> junColumns1) <> " and " <> junConstraint2 <> fmtEls (snd <$> junColumns2))
          ]
-        M2O cons -> [
+        M2O cons relColumns -> [
            "cardinality" .= ("many-to-one" :: Text)
-          , "relationship" .= (cons <> fmtEls (colName <$> relColumns) <> fmtEls (colName <$> relForeignColumns))
+          , "relationship" .= (cons <> " using " <> qiName relTable <> fmtEls (fst <$> relColumns) <> " and " <> qiName relForeignTable <> fmtEls (snd <$> relColumns))
          ]
-        O2M cons -> [
+        O2O cons relColumns -> [
+            "cardinality" .= ("one-to-one" :: Text)
+          , "relationship" .= (cons <> " using " <> qiName relTable <> fmtEls (fst <$> relColumns) <> " and " <> qiName relForeignTable <> fmtEls (snd <$> relColumns))
+          ]
+        O2M cons relColumns -> [
            "cardinality" .= ("one-to-many" :: Text)
-          , "relationship" .= (cons <> fmtEls (colName <$> relColumns) <> fmtEls (colName <$> relForeignColumns))
+          , "relationship" .= (cons <> " using " <> qiName relTable <> fmtEls (fst <$> relColumns) <> " and " <> qiName relForeignTable <> fmtEls (snd <$> relColumns))
          ]

 relHint :: [Relationship] -> Text
 relHint rels = T.intercalate ", " (hintList <$> rels)
  where
    hintList Relationship{..} =
-      let buildHint rel = "'" <> tableName relForeignTable <> "!" <> rel <> "'" in
+      let buildHint rel = "'" <> qiName relForeignTable <> "!" <> rel <> "'" in
      case relCardinality of
-        M2M Junction{..} -> buildHint (tableName junTable)
-        M2O cons         -> buildHint cons
-        O2M cons         -> buildHint cons
+        M2M Junction{..} -> buildHint (qiName junTable)
+        M2O cons _       -> buildHint cons
+        O2O cons _       -> buildHint cons
+        O2M cons _       -> buildHint cons
+    -- An ambiguousness error cannot happen for computed relationships TODO refactor so this mempty is not needed
+    hintList ComputedRelationship{} = mempty

 data PgError = PgError Authenticated SQL.UsageError
 type Authenticated = Bool
@@ -163,54 +218,41 @@ instance PgrstError PgError where

  headers err =
    if status err == HTTP.status401
-       then [ContentType.toHeader CTApplicationJSON, ("WWW-Authenticate", "Bearer") :: Header]
-       else [ContentType.toHeader CTApplicationJSON]
+       then [MediaType.toContentType MTApplicationJSON, ("WWW-Authenticate", "Bearer") :: Header]
+       else [MediaType.toContentType MTApplicationJSON]

 instance JSON.ToJSON PgError where
  toJSON (PgError _ usageError) = JSON.toJSON usageError

 instance JSON.ToJSON SQL.UsageError where
  toJSON (SQL.ConnectionError e) = JSON.object [
-    "code"    .= ("" :: Text),
+    "code"    .= ConnectionErrorCode00,
    "message" .= ("Database connection error. Retrying the connection." :: Text),
-    "details" .= (T.decodeUtf8With T.lenientDecode $ fromMaybe "" e :: Text)]
+    "details" .= (T.decodeUtf8With T.lenientDecode $ fromMaybe "" e :: Text),
+    "hint"    .= JSON.Null]
  toJSON (SQL.SessionError e) = JSON.toJSON e -- SQL.Error

 instance JSON.ToJSON SQL.QueryError where
  toJSON (SQL.QueryError _ _ e) = JSON.toJSON e

 instance JSON.ToJSON SQL.CommandError where
-  toJSON (SQL.ResultError (SQL.ServerError c m d h)) = case BS.unpack c of
-    'P':'T':_ -> JSON.object [
-        "details" .= fmap T.decodeUtf8 d,
-        "hint"    .= fmap T.decodeUtf8 h]
+  toJSON (SQL.ResultError (SQL.ServerError c m d h)) = JSON.object [
+    "code"    .= (T.decodeUtf8 c      :: Text),
+    "message" .= (T.decodeUtf8 m      :: Text),
+    "details" .= (fmap T.decodeUtf8 d :: Maybe Text),
+    "hint"    .= (fmap T.decodeUtf8 h :: Maybe Text)]

-    _         -> JSON.object [
-        "code"    .= (T.decodeUtf8 c      :: Text),
-        "message" .= (T.decodeUtf8 m      :: Text),
-        "details" .= (fmap T.decodeUtf8 d :: Maybe Text),
-        "hint"    .= (fmap T.decodeUtf8 h :: Maybe Text)]
+  toJSON (SQL.ResultError resultError) = JSON.object [
+    "code"    .= InternalErrorCode00,
+    "message" .= (show resultError :: Text),
+    "details" .= JSON.Null,
+    "hint"    .= JSON.Null]

-  toJSON (SQL.ResultError (SQL.UnexpectedResult m)) = JSON.object [
-    "message" .= (m :: Text)]
-  toJSON (SQL.ResultError (SQL.RowError i SQL.EndOfInput)) = JSON.object [
-    "message" .= ("Row error: end of input" :: Text),
-    "details" .= ("Attempt to parse more columns than there are in the result" :: Text),
-    "hint"    .= (("Row number " <> show i) :: Text)]
-  toJSON (SQL.ResultError (SQL.RowError i SQL.UnexpectedNull)) = JSON.object [
-    "message" .= ("Row error: unexpected null" :: Text),
-    "details" .= ("Attempt to parse a NULL as some value." :: Text),
-    "hint"    .= (("Row number " <> show i) :: Text)]
-  toJSON (SQL.ResultError (SQL.RowError i (SQL.ValueError d))) = JSON.object [
-    "message" .= ("Row error: Wrong value parser used" :: Text),
-    "details" .= d,
-    "hint"    .= (("Row number " <> show i) :: Text)]
-  toJSON (SQL.ResultError (SQL.UnexpectedAmountOfRows i)) = JSON.object [
-    "message" .= ("Unexpected amount of rows" :: Text),
-    "details" .= i]
  toJSON (SQL.ClientError d) = JSON.object [
+    "code"    .= ConnectionErrorCode01,
    "message" .= ("Database client error. Retrying the connection." :: Text),
-    "details" .= (fmap T.decodeUtf8 d :: Maybe Text)]
+    "details" .= (fmap T.decodeUtf8 d :: Maybe Text),
+    "hint"    .= JSON.Null]

 pgErrorStatus :: Bool -> SQL.UsageError -> HTTP.Status
 pgErrorStatus _      (SQL.ConnectionError _)                                      = HTTP.status503
@@ -243,7 +285,9 @@ pgErrorStatus authed (SQL.SessionError (SQL.QueryError _ _ (SQL.ResultError rErr
        "P0001"   -> HTTP.status400 -- default code for "raise"
        'P':'0':_ -> HTTP.status500 -- PL/pgSQL Error
        'X':'X':_ -> HTTP.status500 -- internal Error
-        "42883"   -> HTTP.status404 -- undefined function
+        "42883"-> if BS.isPrefixOf "function xmlagg(" m
+          then HTTP.status406
+          else HTTP.status404 -- undefined function
        "42P01"   -> HTTP.status404 -- undefined table
        "42501"   -> if authed then HTTP.status403 else HTTP.status401 -- insufficient privilege
        'P':'T':n -> fromMaybe HTTP.status500 (HTTP.mkStatus <$> readMaybe n <*> pure m)
@@ -277,63 +321,97 @@ checkIsFatal _ = Nothing


 data Error
-  = GucHeadersError
+  = ApiRequestError ApiRequestError
+  | BinaryFieldError MediaType
+  | GucHeadersError
  | GucStatusError
-  | BinaryFieldError ContentType
-  | ConnectionLostError
-  | PutMatchingPkError
-  | PutRangeNotAllowedError
-  | JwtTokenMissing
  | JwtTokenInvalid Text
-  | SingularityError Integer
-  | NotFound
-  | ApiRequestError ApiRequestError
+  | JwtTokenMissing
+  | JwtTokenRequired
+  | NoSchemaCacheError
+  | OffLimitsChangesError Int64 Integer
  | PgErr PgError
+  | PutMatchingPkError
+  | SingularityError Integer

 instance PgrstError Error where
+  status (ApiRequestError err)   = status err
+  status BinaryFieldError{}      = HTTP.status406
  status GucHeadersError         = HTTP.status500
  status GucStatusError          = HTTP.status500
-  status (BinaryFieldError _)    = HTTP.status406
-  status ConnectionLostError     = HTTP.status503
-  status PutMatchingPkError      = HTTP.status400
-  status PutRangeNotAllowedError = HTTP.status400
+  status JwtTokenInvalid{}       = HTTP.unauthorized401
  status JwtTokenMissing         = HTTP.status500
-  status (JwtTokenInvalid _)     = HTTP.unauthorized401
-  status (SingularityError _)    = HTTP.status406
-  status NotFound                = HTTP.status404
+  status JwtTokenRequired        = HTTP.unauthorized401
+  status NoSchemaCacheError      = HTTP.status503
+  status OffLimitsChangesError{} = HTTP.status400
  status (PgErr err)             = status err
-  status (ApiRequestError err)   = status err
+  status PutMatchingPkError      = HTTP.status400
+  status SingularityError{}      = HTTP.status406

-  headers (SingularityError _)     = [ContentType.toHeader CTSingularJSON]
-  headers (JwtTokenInvalid m)      = [ContentType.toHeader CTApplicationJSON, invalidTokenHeader m]
-  headers (PgErr err)              = headers err
-  headers (ApiRequestError err)    = headers err
-  headers _                        = [ContentType.toHeader CTApplicationJSON]
+  headers (ApiRequestError err)  = headers err
+  headers (JwtTokenInvalid m)    = [MediaType.toContentType MTApplicationJSON, invalidTokenHeader m]
+  headers JwtTokenRequired       = [MediaType.toContentType MTApplicationJSON, requiredTokenHeader]
+  headers (PgErr err)            = headers err
+  headers SingularityError{}     = [MediaType.toContentType MTSingularJSON]
+  headers _                      = [MediaType.toContentType MTApplicationJSON]

 instance JSON.ToJSON Error where
-  toJSON GucHeadersError           = JSON.object [
-    "message" .= ("response.headers guc must be a JSON array composed of objects with a single key and a string value" :: Text)]
-  toJSON GucStatusError           = JSON.object [
-    "message" .= ("response.status guc must be a valid status code" :: Text)]
-  toJSON (BinaryFieldError ct)          = JSON.object [
-    "message" .= ((T.decodeUtf8 (ContentType.toMime ct) <> " requested but more than one column was selected") :: Text)]
-  toJSON ConnectionLostError       = JSON.object [
-    "message" .= ("Database connection lost. Retrying the connection." :: Text)]
+  toJSON NoSchemaCacheError = JSON.object [
+      "code"    .= ConnectionErrorCode02,
+      "message" .= ("Could not query the database for the schema cache. Retrying." :: Text),
+      "details" .= JSON.Null,
+      "hint"    .= JSON.Null]

-  toJSON PutRangeNotAllowedError   = JSON.object [
-    "message" .= ("Range header and limit/offset querystring parameters are not allowed for PUT" :: Text)]
-  toJSON PutMatchingPkError        = JSON.object [
-    "message" .= ("Payload values do not match URL in primary key column(s)" :: Text)]
-
-  toJSON (SingularityError n)      = JSON.object [
-    "message" .= ("JSON object requested, multiple (or no) rows returned" :: Text),
-    "details" .= T.unwords ["Results contain", show n, "rows,", T.decodeUtf8 (ContentType.toMime CTSingularJSON), "requires 1 row"]]
-
-  toJSON JwtTokenMissing           = JSON.object [
-    "message" .= ("Server lacks JWT secret" :: Text)]
+  toJSON JwtTokenMissing = JSON.object [
+      "code"    .= JWTErrorCode00,
+      "message" .= ("Server lacks JWT secret" :: Text),
+      "details" .= JSON.Null,
+      "hint"    .= JSON.Null]
  toJSON (JwtTokenInvalid message) = JSON.object [
-    "message" .= (message :: Text)]
-  toJSON NotFound = JSON.object []
+      "code"    .= JWTErrorCode01,
+      "message" .= (message :: Text),
+      "details" .= JSON.Null,
+      "hint"    .= JSON.Null]
+  toJSON JwtTokenRequired = JSON.object [
+      "code"    .= JWTErrorCode02,
+      "message" .= ("Anonymous access is disabled" :: Text),
+      "details" .= JSON.Null,
+      "hint"    .= JSON.Null]
+
+  toJSON (OffLimitsChangesError n maxs) = JSON.object [
+      "code"    .= ApiRequestErrorCode10,
+      "message" .= ("The maximum number of rows allowed to change was surpassed" :: Text),
+      "details" .= T.unwords ["Results contain", show n, "rows changed but the maximum number allowed is", show maxs],
+      "hint"    .= JSON.Null]
+
+  toJSON GucHeadersError = JSON.object [
+    "code"    .= ApiRequestErrorCode11,
+    "message" .= ("response.headers guc must be a JSON array composed of objects with a single key and a string value" :: Text),
+    "details" .= JSON.Null,
+    "hint"    .= JSON.Null]
+  toJSON GucStatusError = JSON.object [
+    "code"    .= ApiRequestErrorCode12,
+    "message" .= ("response.status guc must be a valid status code" :: Text),
+    "details" .= JSON.Null,
+    "hint"    .= JSON.Null]
+  toJSON (BinaryFieldError ct) = JSON.object [
+    "code"    .= ApiRequestErrorCode13,
+    "message" .= ((T.decodeUtf8 (MediaType.toMime ct) <> " requested but more than one column was selected") :: Text),
+    "details" .= JSON.Null,
+    "hint"    .= JSON.Null]
+
+  toJSON PutMatchingPkError = JSON.object [
+    "code"    .= ApiRequestErrorCode15,
+    "message" .= ("Payload values do not match URL in primary key column(s)" :: Text),
+    "details" .= JSON.Null,
+    "hint"    .= JSON.Null]
+
+  toJSON (SingularityError n) = JSON.object [
+    "code"    .= ApiRequestErrorCode16,
+    "message" .= ("JSON object requested, multiple (or no) rows returned" :: Text),
+    "details" .= T.unwords ["Results contain", show n, "rows,", T.decodeUtf8 (MediaType.toMime MTSingularJSON), "requires 1 row"],
+    "hint"    .= JSON.Null]
+
  toJSON (PgErr err) = JSON.toJSON err
  toJSON (ApiRequestError err) = JSON.toJSON err

@@ -341,5 +419,86 @@ invalidTokenHeader :: Text -> Header
 invalidTokenHeader m =
  ("WWW-Authenticate", "Bearer error=\"invalid_token\", " <> "error_description=" <> encodeUtf8 (show m))

+requiredTokenHeader :: Header
+requiredTokenHeader = ("WWW-Authenticate", "Bearer")
+
 singularityError :: (Integral a) => a -> Error
 singularityError = SingularityError . toInteger
+
+-- Error codes are grouped by common modules or characteristics
+data ErrorCode
+  -- PostgreSQL connection errors
+  = ConnectionErrorCode00
+  | ConnectionErrorCode01
+  | ConnectionErrorCode02
+  -- API Request errors
+  | ApiRequestErrorCode00
+  | ApiRequestErrorCode01
+  | ApiRequestErrorCode02
+  | ApiRequestErrorCode03
+  | ApiRequestErrorCode04
+  | ApiRequestErrorCode05
+  | ApiRequestErrorCode06
+  | ApiRequestErrorCode07
+  | ApiRequestErrorCode08
+  | ApiRequestErrorCode09
+  | ApiRequestErrorCode10
+  | ApiRequestErrorCode11
+  | ApiRequestErrorCode12
+  | ApiRequestErrorCode13
+  | ApiRequestErrorCode14
+  | ApiRequestErrorCode15
+  | ApiRequestErrorCode16
+  | ApiRequestErrorCode17
+  -- Schema Cache errors
+  | SchemaCacheErrorCode00
+  | SchemaCacheErrorCode01
+  | SchemaCacheErrorCode02
+  | SchemaCacheErrorCode03
+  -- JWT authentication errors
+  | JWTErrorCode00
+  | JWTErrorCode01
+  | JWTErrorCode02
+  -- Internal errors related to the Hasql library
+  | InternalErrorCode00
+
+instance JSON.ToJSON ErrorCode where
+  toJSON e = JSON.toJSON (buildErrorCode e)
+
+-- New group of errors will be added at the end of all the groups and will have the next prefix in the sequence
+-- New errors are added at the end of the group they belong to and will have the next code in the sequence
+buildErrorCode :: ErrorCode -> Text
+buildErrorCode code = "PGRST" <> case code of
+  ConnectionErrorCode00  -> "000"
+  ConnectionErrorCode01  -> "001"
+  ConnectionErrorCode02  -> "002"
+
+  ApiRequestErrorCode00  -> "100"
+  ApiRequestErrorCode01  -> "101"
+  ApiRequestErrorCode02  -> "102"
+  ApiRequestErrorCode03  -> "103"
+  ApiRequestErrorCode04  -> "104"
+  ApiRequestErrorCode05  -> "105"
+  ApiRequestErrorCode06  -> "106"
+  ApiRequestErrorCode07  -> "107"
+  ApiRequestErrorCode08  -> "108"
+  ApiRequestErrorCode09  -> "109"
+  ApiRequestErrorCode10  -> "110"
+  ApiRequestErrorCode11  -> "111"
+  ApiRequestErrorCode12  -> "112"
+  ApiRequestErrorCode13  -> "113"
+  ApiRequestErrorCode14  -> "114"
+  ApiRequestErrorCode15  -> "115"
+  ApiRequestErrorCode16  -> "116"
+  ApiRequestErrorCode17  -> "117"
+
+  SchemaCacheErrorCode00 -> "200"
+  SchemaCacheErrorCode01 -> "201"
+  SchemaCacheErrorCode02 -> "202"
+  SchemaCacheErrorCode03 -> "203"
+
+  JWTErrorCode00         -> "300"
+  JWTErrorCode01         -> "301"
+  JWTErrorCode02         -> "302"
+
+  InternalErrorCode00    -> "X00"
@@ -5,8 +5,9 @@ module PostgREST.GucHeader
  ) where

 import qualified Data.Aeson           as JSON
+import qualified Data.Aeson.Key       as K
+import qualified Data.Aeson.KeyMap    as KM
 import qualified Data.CaseInsensitive as CI
-import qualified Data.HashMap.Strict  as M

 import Network.HTTP.Types.Header (Header)

@@ -21,8 +22,8 @@ newtype GucHeader = GucHeader (CI.CI ByteString, ByteString)

 instance JSON.FromJSON GucHeader where
  parseJSON (JSON.Object o) =
-    case M.toList o of
-      [(k, JSON.String s)] -> pure $ GucHeader (CI.mk $ toUtf8 k, toUtf8 s)
+    case KM.toList o of
+      [(k, JSON.String s)] -> pure $ GucHeader (CI.mk $ toUtf8 $ K.toText k, toUtf8 s)
      _ -> mzero
  parseJSON _ = mzero

@@ -0,0 +1,30 @@
+{-|
+Module      : PostgREST.Logger
+Description : Wai Middleware to log requests to stdout.
+-}
+module PostgREST.Logger (middleware) where
+
+import qualified Network.Wai                          as Wai
+import qualified Network.Wai.Middleware.RequestLogger as Wai
+
+import Network.HTTP.Types.Status (status400, status500)
+import System.IO.Unsafe          (unsafePerformIO)
+
+import qualified PostgREST.Auth   as Auth
+import           PostgREST.Config (LogLevel (..))
+
+import Protolude
+
+middleware :: LogLevel -> Wai.Middleware
+middleware logLevel = case logLevel of
+  LogInfo  -> requestLogger (const True)
+  LogWarn  -> requestLogger (>= status400)
+  LogError -> requestLogger (>= status500)
+  LogCrit  -> requestLogger (const False)
+  where
+    requestLogger filterStatus = unsafePerformIO $ Wai.mkRequestLogger Wai.defaultRequestLoggerSettings
+      { Wai.outputFormat = Wai.ApacheWithSettings $
+          Wai.defaultApacheSettings
+            & Wai.setApacheRequestFilter (\_ res -> filterStatus $ Wai.responseStatus res)
+            & Wai.setApacheUserGetter (fmap encodeUtf8 . Auth.getRole)
+      }
@@ -0,0 +1,124 @@
+{-# LANGUAGE DuplicateRecordFields #-}
+
+module PostgREST.MediaType
+  ( MediaType(..)
+  , MTPlanOption (..)
+  , MTPlanFormat (..)
+  , MTPlanAttrs(..)
+  , toContentType
+  , toMime
+  , decodeMediaType
+  , getMediaType
+  ) where
+
+import qualified Data.ByteString          as BS
+import qualified Data.ByteString.Internal as BS (c2w)
+import           Data.Maybe               (fromJust)
+
+import Network.HTTP.Types.Header (Header, hContentType)
+
+import Protolude
+
+-- | Enumeration of currently supported media types
+data MediaType
+  = MTApplicationJSON
+  | MTSingularJSON
+  | MTGeoJSON
+  | MTTextCSV
+  | MTTextPlain
+  | MTTextXML
+  | MTOpenAPI
+  | MTUrlEncoded
+  | MTOctetStream
+  | MTAny
+  | MTOther ByteString
+  | MTPlan MTPlanAttrs
+  deriving Eq
+
+data MTPlanAttrs = MTPlanAttrs (Maybe MediaType) MTPlanFormat [MTPlanOption]
+instance Eq MTPlanAttrs where
+  MTPlanAttrs {} == MTPlanAttrs {} = True -- we don't care about the attributes when comparing two MTPlan media types
+
+data MTPlanOption
+  = PlanAnalyze | PlanVerbose | PlanSettings | PlanBuffers | PlanWAL
+
+data MTPlanFormat
+  = PlanJSON | PlanText
+
+-- | Convert MediaType to a Content-Type HTTP Header
+toContentType :: MediaType -> Header
+toContentType ct = (hContentType, toMime ct <> charset)
+  where
+    charset = case ct of
+      MTOctetStream -> mempty
+      MTOther _     -> mempty
+      _             -> "; charset=utf-8"
+
+-- | Convert from MediaType to a ByteString representing the mime type
+toMime :: MediaType -> ByteString
+toMime MTApplicationJSON = "application/json"
+toMime MTGeoJSON         = "application/geo+json"
+toMime MTTextCSV         = "text/csv"
+toMime MTTextPlain       = "text/plain"
+toMime MTTextXML         = "text/xml"
+toMime MTOpenAPI         = "application/openapi+json"
+toMime MTSingularJSON    = "application/vnd.pgrst.object+json"
+toMime MTUrlEncoded      = "application/x-www-form-urlencoded"
+toMime MTOctetStream     = "application/octet-stream"
+toMime MTAny             = "*/*"
+toMime (MTOther ct)      = ct
+toMime (MTPlan (MTPlanAttrs mt fmt opts)) =
+  "application/vnd.pgrst.plan+" <> toMimePlanFormat fmt <>
+  (if isNothing mt then mempty else "; for=\"" <> toMime (fromJust mt) <> "\"") <>
+  (if null opts then mempty else "; options=" <> BS.intercalate "|" (toMimePlanOption <$> opts))
+
+toMimePlanOption :: MTPlanOption -> ByteString
+toMimePlanOption PlanAnalyze  = "analyze"
+toMimePlanOption PlanVerbose  = "verbose"
+toMimePlanOption PlanSettings = "settings"
+toMimePlanOption PlanBuffers  = "buffers"
+toMimePlanOption PlanWAL      = "wal"
+
+toMimePlanFormat :: MTPlanFormat -> ByteString
+toMimePlanFormat PlanJSON = "json"
+toMimePlanFormat PlanText = "text"
+
+-- | Convert from ByteString to MediaType. Warning: discards MIME parameters
+decodeMediaType :: BS.ByteString -> MediaType
+decodeMediaType mt =
+  case BS.split (BS.c2w ';') mt of
+    "application/json":_                   -> MTApplicationJSON
+    "application/geo+json":_               -> MTGeoJSON
+    "text/csv":_                           -> MTTextCSV
+    "text/plain":_                         -> MTTextPlain
+    "text/xml":_                           -> MTTextXML
+    "application/openapi+json":_           -> MTOpenAPI
+    "application/vnd.pgrst.object+json":_  -> MTSingularJSON
+    "application/vnd.pgrst.object":_       -> MTSingularJSON
+    "application/x-www-form-urlencoded":_  -> MTUrlEncoded
+    "application/octet-stream":_           -> MTOctetStream
+    "application/vnd.pgrst.plan":rest      -> getPlan PlanText rest
+    "application/vnd.pgrst.plan+text":rest -> getPlan PlanText rest
+    "application/vnd.pgrst.plan+json":rest -> getPlan PlanJSON rest
+    "*/*":_                                -> MTAny
+    other:_                                -> MTOther other
+    _                                      -> MTAny
+  where
+    getPlan fmt rest =
+     let
+       opts         = BS.split (BS.c2w '|') $ fromMaybe mempty (BS.stripPrefix "options=" =<< find (BS.isPrefixOf "options=") rest)
+       inOpts str   = str `elem` opts
+       mtFor        = decodeMediaType . dropAround (== BS.c2w '"') <$> (BS.stripPrefix "for=" =<< find (BS.isPrefixOf "for=") rest)
+       dropAround p = BS.dropWhile p . BS.dropWhileEnd p in
+     MTPlan $ MTPlanAttrs mtFor fmt $
+      [PlanAnalyze  | inOpts "analyze" ] ++
+      [PlanVerbose  | inOpts "verbose" ] ++
+      [PlanSettings | inOpts "settings"] ++
+      [PlanBuffers  | inOpts "buffers" ] ++
+      [PlanWAL      | inOpts "wal"     ]
+
+getMediaType :: MediaType -> MediaType
+getMediaType mt = case mt of
+  MTPlan (MTPlanAttrs (Just mType) _ _) -> mType
+  MTPlan (MTPlanAttrs Nothing _ _)      -> MTApplicationJSON
+  other                                 -> other
@@ -2,52 +2,36 @@
 Module      : PostgREST.Middleware
 Description : Sets CORS policy. Also the PostgreSQL GUCs, role, search_path and pre-request function.
 -}
+{-# LANGUAGE BlockArguments  #-}
 {-# LANGUAGE RecordWildCards #-}
 module PostgREST.Middleware
  ( runPgLocals
-  , pgrstFormat
-  , pgrstMiddleware
-  , defaultCorsPolicy
-  , corsPolicy
  , optionalRollback
  ) where

-import qualified Data.Aeson                           as JSON
-import qualified Data.ByteString.Char8                as BS
-import qualified Data.ByteString.Lazy.Char8           as LBS
-import qualified Data.CaseInsensitive                 as CI
-import qualified Data.HashMap.Strict                  as M
-import qualified Data.Text                            as T
-import qualified Data.Text.Encoding                   as T
-import qualified Hasql.Decoders                       as HD
-import qualified Hasql.DynamicStatements.Snippet      as SQL hiding
-                                                             (sql)
-import qualified Hasql.DynamicStatements.Statement    as SQL
-import qualified Hasql.Transaction                    as SQL
-import qualified Network.Wai                          as Wai
-import qualified Network.Wai.Logger                   as Wai
-import qualified Network.Wai.Middleware.Cors          as Wai
-import qualified Network.Wai.Middleware.Gzip          as Wai
-import qualified Network.Wai.Middleware.RequestLogger as Wai
-import qualified Network.Wai.Middleware.Static        as Wai
+import qualified Data.Aeson                        as JSON
+import qualified Data.Aeson.Key                    as K
+import qualified Data.Aeson.KeyMap                 as KM
+import qualified Data.ByteString.Lazy.Char8        as LBS
+import qualified Data.HashMap.Strict               as HM
+import qualified Data.Text.Encoding                as T
+import qualified Hasql.Decoders                    as HD
+import qualified Hasql.DynamicStatements.Snippet   as SQL hiding (sql)
+import qualified Hasql.DynamicStatements.Statement as SQL
+import qualified Hasql.Transaction                 as SQL
+import qualified Network.Wai                       as Wai
+

 import Control.Arrow ((***))

-import Data.Function             (id)
-import Data.List                 (lookup)
-import Data.Scientific           (FPFormat (..), formatScientific,
-                                  isInteger)
-import Network.HTTP.Types.Status (Status, status400, status500,
-                                  statusCode)
-import System.IO.Unsafe          (unsafePerformIO)
-import System.Log.FastLogger     (toLogStr)
+import Data.Scientific (FPFormat (..), formatScientific, isInteger)

-import PostgREST.Config             (AppConfig (..), LogLevel (..))
+import PostgREST.Config             (AppConfig (..))
 import PostgREST.Config.PgVersion   (PgVersion (..), pgVersion140)
 import PostgREST.Error              (Error, errorResponseFor)
 import PostgREST.GucHeader          (addHeadersIfNotIncluded)
 import PostgREST.Query.SqlFragment  (fromQi, intercalateSnippet,
-                                     unknownEncoder)
+                                     pgFmtIdentList, unknownEncoder)
 import PostgREST.Request.ApiRequest (ApiRequest (..), Target (..))

 import PostgREST.Request.Preferences
@@ -55,10 +39,10 @@ import PostgREST.Request.Preferences
 import Protolude

 -- | Runs local(transaction scoped) GUCs for every request, plus the pre-request function
-runPgLocals :: AppConfig   -> M.HashMap Text JSON.Value ->
+runPgLocals :: AppConfig   -> KM.KeyMap JSON.Value -> Text ->
               (ApiRequest -> ExceptT Error SQL.Transaction Wai.Response) ->
               ApiRequest  -> ByteString -> PgVersion -> ExceptT Error SQL.Transaction Wai.Response
-runPgLocals conf claims app req jsonDbS actualPgVersion = do
+runPgLocals conf claims role app req jsonDbS actualPgVersion = do
  lift $ SQL.statement mempty $ SQL.dynamicallyParameterized
    ("select " <> intercalateSnippet ", " (searchPathSql : roleSql ++ claimsSql ++ [methodSql, pathSql] ++ headersSql ++ cookiesSql ++ appSettingsSql ++ specSql))
    HD.noResult (configDbPreparedStatements conf)
@@ -73,93 +57,26 @@ runPgLocals conf claims app req jsonDbS actualPgVersion = do
    cookiesSql = if usesLegacyGucs
                   then setConfigLocal "request.cookie." <$> iCookies req
                   else setConfigLocalJson "request.cookies" (iCookies req)
-    claimsWithRole =
-      let anon = JSON.String . toS $ configDbAnonRole conf in -- role claim defaults to anon if not specified in jwt
-      M.union claims (M.singleton "role" anon)
    claimsSql = if usesLegacyGucs
-                  then setConfigLocal "request.jwt.claim." <$> [(toUtf8 c, toUtf8 $ unquoted v) | (c,v) <- M.toList claimsWithRole]
-                  else [setConfigLocal mempty ("request.jwt.claims", LBS.toStrict $ JSON.encode claimsWithRole)]
-    roleSql = maybeToList $ (\x -> setConfigLocal mempty ("role", toUtf8 $ unquoted x)) <$> M.lookup "role" claimsWithRole
+                  then setConfigLocal "request.jwt.claim." <$> [(toUtf8 $ K.toText c, toUtf8 $ unquoted v) | (c,v) <- KM.toList claims]
+                  else [setConfigLocal mempty ("request.jwt.claims", LBS.toStrict $ JSON.encode claims)]
+    roleSql = [setConfigLocal mempty ("role", toUtf8 role)]
    appSettingsSql = setConfigLocal mempty <$> (join bimap toUtf8 <$> configAppSettings conf)
    searchPathSql =
-      let schemas = T.intercalate ", " (iSchema req : configDbExtraSearchPath conf) in
-      setConfigLocal mempty ("search_path", toUtf8 schemas)
+      let schemas = pgFmtIdentList (iSchema req : configDbExtraSearchPath conf) in
+      setConfigLocal mempty ("search_path", schemas)
    preReqSql = (\f -> "select " <> fromQi f <> "();") <$> configDbPreRequest conf
    specSql = case iTarget req of
      TargetProc{tpIsRootSpec=True} -> [setConfigLocal mempty ("request.spec", jsonDbS)]
      _                             -> mempty
    usesLegacyGucs = configDbUseLegacyGucs conf && actualPgVersion < pgVersion140

-- | Log in apache format. Only requests that have a status greater than minStatus are logged.
-- | There's no way to filter logs in the apache format on wai-extra: https://hackage.haskell.org/package/wai-extra-3.0.29.2/docs/Network-Wai-Middleware-RequestLogger.html#t:OutputFormat.
-- | So here we copy wai-logger apacheLogStr function: https://github.com/kazu-yamamoto/logger/blob/a4f51b909a099c51af7a3f75cf16e19a06f9e257/wai-logger/Network/Wai/Logger/Apache.hs#L45
-- | TODO: Add the ability to filter apache logs on wai-extra and remove this function.
-pgrstFormat :: Status -> Wai.OutputFormatter
-pgrstFormat minStatus date req status responseSize =
-  if status < minStatus
-    then mempty
-  else toLogStr (getSourceFromSocket req)
-    <> " - - ["
-    <> toLogStr date
-    <> "] \""
-    <> toLogStr (Wai.requestMethod req)
-    <> " "
-    <> toLogStr (Wai.rawPathInfo req <> Wai.rawQueryString req)
-    <> " "
-    <> toLogStr (show (Wai.httpVersion req)::Text)
-    <> "\" "
-    <> toLogStr (show (statusCode status)::Text)
-    <> " "
-    <> toLogStr (maybe "-" show responseSize::Text)
-    <> " \""
-    <> toLogStr (fromMaybe mempty $ Wai.requestHeaderReferer req)
-    <> "\" \""
-    <> toLogStr (fromMaybe mempty $ Wai.requestHeaderUserAgent req)
-    <> "\"\n"
-  where
-    getSourceFromSocket = BS.pack . Wai.showSockAddr . Wai.remoteHost
-
-pgrstMiddleware :: LogLevel -> Wai.Application -> Wai.Application
-pgrstMiddleware logLevel =
-    logger
-  . Wai.cors corsPolicy
-  . Wai.staticPolicy (Wai.only [("favicon.ico", "static/favicon.ico")])
-  where
-    logger = case logLevel of
-      LogCrit  -> id
-      LogError -> unsafePerformIO $ Wai.mkRequestLogger Wai.def { Wai.outputFormat = Wai.CustomOutputFormat $ pgrstFormat status500}
-      LogWarn  -> unsafePerformIO $ Wai.mkRequestLogger Wai.def { Wai.outputFormat = Wai.CustomOutputFormat $ pgrstFormat status400}
-      LogInfo  -> Wai.logStdout
-
-defaultCorsPolicy :: Wai.CorsResourcePolicy
-defaultCorsPolicy =  Wai.CorsResourcePolicy Nothing
-  ["GET", "POST", "PATCH", "PUT", "DELETE", "OPTIONS"] ["Authorization"] Nothing
-  (Just $ 60*60*24) False False True
-
-- | CORS policy to be used in by Wai Cors middleware
-corsPolicy :: Wai.Request -> Maybe Wai.CorsResourcePolicy
-corsPolicy req = case lookup "origin" headers of
-  Just origin -> Just defaultCorsPolicy {
-      Wai.corsOrigins = Just ([origin], True)
-    , Wai.corsRequestHeaders = "Authentication" : accHeaders
-    , Wai.corsExposedHeaders = Just [
-        "Content-Encoding", "Content-Location", "Content-Range", "Content-Type"
-      , "Date", "Location", "Server", "Transfer-Encoding", "Range-Unit"
-      ]
-    }
-  Nothing -> Nothing
-  where
-    headers = Wai.requestHeaders req
-    accHeaders = case lookup "access-control-request-headers" headers of
-      Just hdrs -> map (CI.mk . BS.strip) $ BS.split ',' hdrs
-      Nothing   -> []
-
-unquoted :: JSON.Value -> Text
-unquoted (JSON.String t) = t
-unquoted (JSON.Number n) =
-  toS $ formatScientific Fixed (if isInteger n then Just 0 else Nothing) n
-unquoted (JSON.Bool b) = show b
-unquoted v = T.decodeUtf8 . LBS.toStrict $ JSON.encode v
+    unquoted :: JSON.Value -> Text
+    unquoted (JSON.String t) = t
+    unquoted (JSON.Number n) =
+      toS $ formatScientific Fixed (if isInteger n then Just 0 else Nothing) n
+    unquoted (JSON.Bool b) = show b
+    unquoted v = T.decodeUtf8 . LBS.toStrict $ JSON.encode v

 -- | Set a transaction to eventually roll back if requested and set respective
 -- headers on the response.
@@ -170,8 +87,9 @@ optionalRollback
  -> ExceptT Error SQL.Transaction Wai.Response
 optionalRollback AppConfig{..} ApiRequest{..} transaction = do
  resp <- catchError transaction $ return . errorResponseFor
-  when (shouldRollback || (configDbTxRollbackAll && not shouldCommit))
-    (lift SQL.condemn)
+  when (shouldRollback || (configDbTxRollbackAll && not shouldCommit)) $ lift do
+    SQL.sql "SET CONSTRAINTS ALL IMMEDIATE"
+    SQL.condemn
  return $ Wai.mapResponseHeaders preferenceApplied resp
  where
    shouldCommit =
@@ -199,6 +117,6 @@ setConfigLocalJson :: ByteString -> [(ByteString, ByteString)] -> [SQL.Snippet]
 setConfigLocalJson prefix keyVals = [setConfigLocal mempty (prefix, gucJsonVal keyVals)]
  where
    gucJsonVal :: [(ByteString, ByteString)] -> ByteString
-    gucJsonVal = LBS.toStrict . JSON.encode . M.fromList . arrayByteStringToText
+    gucJsonVal = LBS.toStrict . JSON.encode . HM.fromList . arrayByteStringToText
    arrayByteStringToText :: [(ByteString, ByteString)] -> [(Text,Text)]
    arrayByteStringToText keyVal = (T.decodeUtf8 *** T.decodeUtf8) <$> keyVal
@@ -3,14 +3,13 @@ Module      : PostgREST.OpenAPI
 Description : Generates the OpenAPI output
 -}
 {-# LANGUAGE LambdaCase      #-}
-{-# LANGUAGE NamedFieldPuns  #-}
 {-# LANGUAGE RecordWildCards #-}
 module PostgREST.OpenAPI (encode) where

 import qualified Data.Aeson            as JSON
 import qualified Data.ByteString.Char8 as BS
 import qualified Data.ByteString.Lazy  as LBS
-import qualified Data.HashMap.Strict   as M
+import qualified Data.HashMap.Strict   as HM
 import qualified Data.HashSet.InsOrd   as Set
 import qualified Data.Text             as T
 import qualified Data.Text.Encoding    as T
@@ -27,86 +26,89 @@ import Data.Swagger

 import PostgREST.Config                   (AppConfig (..), Proxy (..),
                                           isMalformedProxyUri, toURI)
-import PostgREST.DbStructure              (DbStructure (..),
-                                           tableCols, tablePKCols)
+import PostgREST.DbStructure              (DbStructure (..))
+import PostgREST.DbStructure.Identifiers  (QualifiedIdentifier (..))
 import PostgREST.DbStructure.Proc         (ProcDescription (..),
                                           ProcParam (..))
 import PostgREST.DbStructure.Relationship (Cardinality (..),
-                                           PrimaryKey (..),
-                                           Relationship (..))
-import PostgREST.DbStructure.Table        (Column (..), Table (..))
+                                           Relationship (..),
+                                           RelationshipsMap)
+import PostgREST.DbStructure.Table        (Column (..), Table (..),
+                                           TablesMap)
 import PostgREST.Version                  (docsVersion, prettyVersion)

-import PostgREST.ContentType
+import PostgREST.MediaType

 import Protolude hiding (Proxy, get)

-encode :: AppConfig -> DbStructure -> [Table] -> M.HashMap k [ProcDescription] -> Maybe Text -> LBS.ByteString
+encode :: AppConfig -> DbStructure -> TablesMap -> HM.HashMap k [ProcDescription] -> Maybe Text -> LBS.ByteString
 encode conf dbStructure tables procs schemaDescription =
  JSON.encode $
    postgrestSpec
      (dbRelationships dbStructure)
-      (concat $ M.elems procs)
-      (openApiTableInfo dbStructure <$> tables)
+      (concat $ HM.elems procs)
+      (snd <$> HM.toList tables)
      (proxyUri conf)
      schemaDescription
-      (dbPrimaryKeys dbStructure)
+      (configOpenApiSecurityActive conf)

-makeMimeList :: [ContentType] -> MimeList
+makeMimeList :: [MediaType] -> MimeList
 makeMimeList cs = MimeList $ fmap (fromString . BS.unpack . toMime) cs

-toSwaggerType :: Text -> SwaggerType t
-toSwaggerType "character varying" = SwaggerString
-toSwaggerType "character"         = SwaggerString
-toSwaggerType "text"              = SwaggerString
-toSwaggerType "boolean"           = SwaggerBoolean
-toSwaggerType "smallint"          = SwaggerInteger
-toSwaggerType "integer"           = SwaggerInteger
-toSwaggerType "bigint"            = SwaggerInteger
-toSwaggerType "numeric"           = SwaggerNumber
-toSwaggerType "real"              = SwaggerNumber
-toSwaggerType "double precision"  = SwaggerNumber
-toSwaggerType "ARRAY"             = SwaggerArray
-toSwaggerType _                   = SwaggerString
+toSwaggerType :: Text -> Maybe (SwaggerType t)
+toSwaggerType "character varying" = Just SwaggerString
+toSwaggerType "character"         = Just SwaggerString
+toSwaggerType "text"              = Just SwaggerString
+toSwaggerType "boolean"           = Just SwaggerBoolean
+toSwaggerType "smallint"          = Just SwaggerInteger
+toSwaggerType "integer"           = Just SwaggerInteger
+toSwaggerType "bigint"            = Just SwaggerInteger
+toSwaggerType "numeric"           = Just SwaggerNumber
+toSwaggerType "real"              = Just SwaggerNumber
+toSwaggerType "double precision"  = Just SwaggerNumber
+toSwaggerType "ARRAY"             = Just SwaggerArray
+toSwaggerType "json"              = Nothing
+toSwaggerType "jsonb"             = Nothing
+toSwaggerType _                   = Just SwaggerString

 parseDefault :: Text -> Text -> Text
 parseDefault colType colDefault =
  case toSwaggerType colType of
-    SwaggerString -> wrapInQuotations $ case T.stripSuffix ("::" <> colType) colDefault of
+    Just SwaggerString -> wrapInQuotations $ case T.stripSuffix ("::" <> colType) colDefault of
      Just def -> T.dropAround (=='\'')  def
      Nothing  -> colDefault
    _ -> colDefault
  where
    wrapInQuotations text = "\"" <> text <> "\""

-makeTableDef :: [Relationship] -> [PrimaryKey] -> (Table, [Column], [Text]) -> (Text, Schema)
-makeTableDef rels pks (t, cs, _) =
+makeTableDef :: RelationshipsMap -> Table -> (Text, Schema)
+makeTableDef rels t =
  let tn = tableName t in
      (tn, (mempty :: Schema)
        & description .~ tableDescription t
        & type_ ?~ SwaggerObject
-        & properties .~ fromList (fmap (makeProperty rels pks) cs)
-        & required .~ fmap colName (filter (not . colNullable) cs))
+        & properties .~ fromList (makeProperty t rels <$> tableColumns t)
+        & required .~ fmap colName (filter (not . colNullable) $ tableColumns t))

-makeProperty :: [Relationship] -> [PrimaryKey] -> Column -> (Text, Referenced Schema)
-makeProperty rels pks c = (colName c, Inline s)
+makeProperty :: Table -> RelationshipsMap -> Column -> (Text, Referenced Schema)
+makeProperty tbl rels col = (colName col, Inline s)
  where
-    e = if null $ colEnum c then Nothing else JSON.decode $ JSON.encode $ colEnum c
+    e = if null $ colEnum col then Nothing else JSON.decode $ JSON.encode $ colEnum col
    fk :: Maybe Text
    fk =
      let
        -- Finds the relationship that has a single column foreign key
        rel = find (\case
-          Relationship{relColumns, relCardinality=M2O _} -> [c] == relColumns
-          _                                                 -> False
-          ) rels
-        fCol = colName <$> (headMay . relForeignColumns =<< rel)
-        fTbl = tableName . relForeignTable <$> rel
+          Relationship{relCardinality=(M2O _ relColumns)} -> [colName col] == (fst <$> relColumns)
+          _                                               -> False
+          ) $ fromMaybe mempty $ HM.lookup (QualifiedIdentifier (tableSchema tbl) (tableName tbl), tableSchema tbl) rels
+        fCol = (headMay . (\r -> snd <$> relColumns (relCardinality r)) =<< rel)
+        fTbl = qiName . relForeignTable <$> rel
        fTblCol = (,) <$> fTbl <*> fCol
      in
        (\(a, b) -> T.intercalate "" ["This is a Foreign Key to `", a, ".", b, "`.<fk table='", a, "' column='", b, "'/>"]) <$> fTblCol
    pk :: Bool
-    pk = any (\p -> pkTable p == colTable c && pkName p == colName c) pks
+    pk = colName col `elem` tablePKCols tbl
    n = catMaybes
      [ Just "Note:"
      , if pk then Just "This is a Primary Key.<pk/>" else Nothing
@@ -114,17 +116,17 @@ makeProperty rels pks c = (colName c, Inline s)
      ]
    d =
      if length n > 1 then
-        Just $ T.append (maybe "" (`T.append` "\n\n") $ colDescription c) (T.intercalate "\n" n)
+        Just $ T.append (maybe "" (`T.append` "\n\n") $ colDescription col) (T.intercalate "\n" n)
      else
-        colDescription c
+        colDescription col
    s =
      (mempty :: Schema)
-        & default_ .~ (JSON.decode . toUtf8Lazy . parseDefault (colType c) =<< colDefault c)
+        & default_ .~ (JSON.decode . toUtf8Lazy . parseDefault (colType col) =<< colDefault col)
        & description .~ d
        & enum_ .~ e
-        & format ?~ colType c
-        & maxLength .~ (fromIntegral <$> colMaxLen c)
-        & type_ ?~ toSwaggerType (colType c)
+        & format ?~ colType col
+        & maxLength .~ (fromIntegral <$> colMaxLen col)
+        & type_ .~ toSwaggerType (colType col)

 makeProcSchema :: ProcDescription -> Schema
 makeProcSchema pd =
@@ -138,7 +140,7 @@ makeProcProperty :: ProcParam -> (Text, Referenced Schema)
 makeProcProperty (ProcParam n t _ _) = (n, Inline s)
  where
    s = (mempty :: Schema)
-          & type_ ?~ toSwaggerType t
+          & type_ .~ toSwaggerType t
          & format ?~ t

 makePreferParam :: [Text] -> Param
@@ -161,7 +163,7 @@ makeProcParam pd =
  , Ref $ Reference "preferParams"
  ]

-makeParamDefs :: [(Table, [Column], [Text])] -> [(Text, Param)]
+makeParamDefs :: [Table] -> [(Text, Param)]
 makeParamDefs ti =
  [ ("preferParams", makePreferParam ["params=single-object"])
  , ("preferReturn", makePreferParam ["return=representation", "return=minimal", "return=none"])
@@ -217,8 +219,8 @@ makeParamDefs ti =
        & in_ .~ ParamQuery
        & type_ ?~ SwaggerString))
  ]
-  <> concat [ makeObjectBody (tableName t) : makeRowFilters (tableName t) cs
-            | (t, cs, _) <- ti
+  <> concat [ makeObjectBody (tableName t) : makeRowFilters (tableName t) (tableColumns t)
+            | t <- ti
            ]

 makeObjectBody :: Text -> (Text, Param)
@@ -243,8 +245,8 @@ makeRowFilter tn c =
 makeRowFilters :: Text -> [Column] -> [(Text, Param)]
 makeRowFilters tn = fmap (makeRowFilter tn)

-makePathItem :: (Table, [Column], [Text]) -> (FilePath, PathItem)
-makePathItem (t, cs, _) = ("/" ++ T.unpack tn, p $ tableInsertable t || tableUpdatable t || tableDeletable t)
+makePathItem :: Table -> (FilePath, PathItem)
+makePathItem t = ("/" ++ T.unpack tn, p $ tableInsertable t || tableUpdatable t || tableDeletable t)
  where
    -- Use first line of table description as summary; rest as description (if present)
    -- We strip leading newlines from description so that users can include a blank line between summary and description
@@ -278,7 +280,7 @@ makePathItem (t, cs, _) = ("/" ++ T.unpack tn, p $ tableInsertable t || tableUpd
    p False = pr
    p True  = pw
    tn = tableName t
-    rs = [ T.intercalate "." ["rowFilter", tn, colName c ] | c <- cs ]
+    rs = [ T.intercalate "." ["rowFilter", tn, colName c ] | c <- tableColumns t ]
    ref = Ref . Reference

 makeProcPathItem :: ProcDescription -> (FilePath, PathItem)
@@ -293,7 +295,7 @@ makeProcPathItem pd = ("/rpc/" ++ toS (pdName pd), pe)
      & description .~ mfilter (/="") pDesc
      & parameters .~ makeProcParam pd
      & tags .~ Set.fromList ["(rpc) " <> pdName pd]
-      & produces ?~ makeMimeList [CTApplicationJSON, CTSingularJSON]
+      & produces ?~ makeMimeList [MTApplicationJSON, MTSingularJSON]
      & at 200 ?~ "OK"
    pe = (mempty :: PathItem) & post ?~ postOp

@@ -303,15 +305,23 @@ makeRootPathItem = ("/", p)
    getOp = (mempty :: Operation)
      & tags .~ Set.fromList ["Introspection"]
      & summary ?~ "OpenAPI description (this document)"
-      & produces ?~ makeMimeList [CTOpenAPI, CTApplicationJSON]
+      & produces ?~ makeMimeList [MTOpenAPI, MTApplicationJSON]
      & at 200 ?~ "OK"
    pr = (mempty :: PathItem) & get ?~ getOp
    p = pr

-makePathItems :: [ProcDescription] -> [(Table, [Column], [Text])] -> InsOrdHashMap FilePath PathItem
+makePathItems :: [ProcDescription] -> [Table] -> InsOrdHashMap FilePath PathItem
 makePathItems pds ti = fromList $ makeRootPathItem :
  fmap makePathItem ti ++ fmap makeProcPathItem pds

+makeSecurityDefinitions :: Text -> Bool -> SecurityDefinitions
+makeSecurityDefinitions secName allow
+  | allow = SecurityDefinitions (fromList [(secName, SecurityScheme secSchType secSchDescription)])
+  | otherwise    = mempty
+  where
+    secSchType = SecuritySchemeApiKey (ApiKeyParams "Authorization" ApiKeyHeader)
+    secSchDescription = Just "Add the token prepending \"Bearer \" (without quotes) to it"
+
 escapeHostName :: Text -> Text
 escapeHostName "*"  = "0.0.0.0"
 escapeHostName "*4" = "0.0.0.0"
@@ -320,8 +330,8 @@ escapeHostName "*6" = "0.0.0.0"
 escapeHostName "!6" = "0.0.0.0"
 escapeHostName h    = h

-postgrestSpec :: [Relationship] -> [ProcDescription] -> [(Table, [Column], [Text])] -> (Text, Text, Integer, Text) -> Maybe Text -> [PrimaryKey] -> Swagger
-postgrestSpec rels pds ti (s, h, p, b) sd pks = (mempty :: Swagger)
+postgrestSpec :: RelationshipsMap -> [ProcDescription] -> [Table] -> (Text, Text, Integer, Text) -> Maybe Text -> Bool -> Swagger
+postgrestSpec rels pds ti (s, h, p, b) sd allowSecurityDef = (mempty :: Swagger)
  & basePath ?~ T.unpack b
  & schemes ?~ [s']
  & info .~ ((mempty :: Info)
@@ -332,15 +342,18 @@ postgrestSpec rels pds ti (s, h, p, b) sd pks = (mempty :: Swagger)
    & description ?~ "PostgREST Documentation"
    & url .~ URL ("https://postgrest.org/en/" <> docsVersion <> "/api.html"))
  & host .~ h'
-  & definitions .~ fromList (makeTableDef rels pks <$> ti)
+  & definitions .~ fromList (makeTableDef rels <$> ti)
  & parameters .~ fromList (makeParamDefs ti)
  & paths .~ makePathItems pds ti
-  & produces .~ makeMimeList [CTApplicationJSON, CTSingularJSON, CTTextCSV]
-  & consumes .~ makeMimeList [CTApplicationJSON, CTSingularJSON, CTTextCSV]
+  & produces .~ makeMimeList [MTApplicationJSON, MTSingularJSON, MTTextCSV]
+  & consumes .~ makeMimeList [MTApplicationJSON, MTSingularJSON, MTTextCSV]
+  & securityDefinitions .~ makeSecurityDefinitions securityDefName allowSecurityDef
+  & security .~ [SecurityRequirement (fromList [(securityDefName, [])]) | allowSecurityDef]
    where
      s' = if s == "http" then Http else Https
      h' = Just $ Host (T.unpack $ escapeHostName h) (Just (fromInteger p))
      d = fromMaybe "This is a dynamic API generated by PostgREST" sd
+      securityDefName = "JWT"

 pickProxy :: Maybe Text -> Maybe Proxy
 pickProxy proxy
@@ -378,10 +391,3 @@ proxyUri AppConfig{..} =
      (proxyScheme, proxyHost, proxyPort, proxyPath)
    Nothing ->
      ("http", configServerHost, toInteger configServerPort, "/")
-
-openApiTableInfo :: DbStructure -> Table -> (Table, [Column], [Text])
-openApiTableInfo dbStructure table =
-  ( table
-  , tableCols dbStructure (tableSchema table) (tableName table)
-  , tablePKCols dbStructure (tableSchema table) (tableName table)
-  )
@@ -1,4 +1,5 @@
 {-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE NamedFieldPuns        #-}
 {-|
 Module      : PostgREST.Query.QueryBuilder
 Description : PostgREST SQL queries generating functions.
@@ -24,61 +25,62 @@ import Data.Tree (Tree (..))
 import PostgREST.DbStructure.Identifiers  (QualifiedIdentifier (..))
 import PostgREST.DbStructure.Proc         (ProcParam (..))
 import PostgREST.DbStructure.Relationship (Cardinality (..),
+                                           Junction (..),
                                           Relationship (..))
-import PostgREST.DbStructure.Table        (Table (..))
 import PostgREST.Request.Preferences      (PreferResolution (..))

 import PostgREST.Query.SqlFragment
+import PostgREST.RangeQuery          (allRange)
+import PostgREST.Request.MutateQuery
+import PostgREST.Request.ReadQuery
 import PostgREST.Request.Types

 import Protolude

 readRequestToQuery :: ReadRequest -> SQL.Snippet
-readRequestToQuery (Node (Select colSelects mainQi tblAlias implJoins logicForest joinConditions_ ordts range, _) forest) =
+readRequestToQuery (Node (Select colSelects mainQi tblAlias logicForest joinConditions_ ordts range, (_, rel, _, _, _, _)) forest) =
  "SELECT " <>
-  intercalateSnippet ", " ((pgFmtSelectItem qi <$> colSelects) ++ selects) <>
-  "FROM " <> SQL.sql (BS.intercalate ", " (tabl : implJs)) <> " " <>
+  intercalateSnippet ", " ((pgFmtSelectItem qi <$> colSelects) ++ selects) <> " " <>
+  fromFrag <> " " <>
  intercalateSnippet " " joins <> " " <>
-  (if null logicForest && null joinConditions_ then mempty else "WHERE " <> intercalateSnippet " AND " (map (pgFmtLogicTree qi) logicForest ++ map pgFmtJoinCondition joinConditions_))
-  <> " " <>
-  (if null ordts then mempty else "ORDER BY " <> intercalateSnippet ", " (map (pgFmtOrderTerm qi) ordts)) <> " " <>
+  (if null logicForest && null joinConditions_
+    then mempty
+    else "WHERE " <> intercalateSnippet " AND " (map (pgFmtLogicTree qi) logicForest ++ map pgFmtJoinCondition joinConditions_)) <> " " <>
+  orderF qi ordts <> " " <>
  limitOffsetF range
  where
-    implJs = fromQi <$> implJoins
-    tabl = fromQi mainQi <> maybe mempty (\a -> " AS " <> pgFmtIdent a) tblAlias
-    qi = maybe mainQi (QualifiedIdentifier mempty) tblAlias
-    (joins, selects) = foldr getJoinsSelects ([],[]) forest
+    fromFrag = fromF rel mainQi tblAlias
+    qi = getQualifiedIdentifier rel mainQi tblAlias
+    (selects, joins) = foldr getSelectsJoins ([],[]) forest

-getJoinsSelects :: ReadRequest -> ([SQL.Snippet], [SQL.Snippet]) -> ([SQL.Snippet], [SQL.Snippet])
-getJoinsSelects rr@(Node (_, (name, Just Relationship{relCardinality=card,relTable=Table{tableName=table}}, alias, _, joinType, _)) _) (joins,selects) =
-  let subquery = readRequestToQuery rr in
-  case card of
-    M2O _ ->
-      let aliasOrName = fromMaybe name alias
-          localTableName = pgFmtIdent $ table <> "_" <> aliasOrName
-          sel = SQL.sql ("row_to_json(" <> localTableName <> ".*) AS " <> pgFmtIdent aliasOrName)
-          joi = (if joinType == Just JTInner then " INNER" else " LEFT")
-            <> " JOIN LATERAL( " <> subquery <> " ) AS " <> SQL.sql localTableName <> " ON TRUE " in
-      (joi:joins,sel:selects)
-    _ -> case joinType of
-      Just JTInner ->
-        let aliasOrName = fromMaybe name alias
-            locTblName = table <> "_" <> aliasOrName
-            localTableName = pgFmtIdent locTblName
-            internalTableName = pgFmtIdent $ "_" <> locTblName
-            sel = SQL.sql $ localTableName <> "." <> internalTableName <> " AS " <> pgFmtIdent aliasOrName
-            joi = "INNER JOIN LATERAL(" <>
-                    "SELECT json_agg(" <> SQL.sql internalTableName <> ") AS " <> SQL.sql internalTableName <>
-                    "FROM (" <> subquery <> " ) AS " <> SQL.sql internalTableName <>
-                  ") AS " <> SQL.sql localTableName <> " ON " <> SQL.sql localTableName <> "IS NOT NULL" in
-        (joi:joins,sel:selects)
-      _ ->
-        let sel = "COALESCE (("
-               <> "SELECT json_agg(" <> SQL.sql (pgFmtIdent table) <> ".*) "
-               <> "FROM (" <> subquery <> ") " <> SQL.sql (pgFmtIdent table) <> " "
-               <> "), '[]') AS " <> SQL.sql (pgFmtIdent (fromMaybe name alias)) in
-        (joins,sel:selects)
-getJoinsSelects (Node (_, (_, Nothing, _, _, _, _)) _) _ = ([], [])
+getSelectsJoins :: ReadRequest -> ([SQL.Snippet], [SQL.Snippet]) -> ([SQL.Snippet], [SQL.Snippet])
+getSelectsJoins (Node (_, (_, Nothing, _, _, _, _)) _) _ = ([], [])
+getSelectsJoins rr@(Node (_, (name, Just rel, alias, _, joinType, _)) _) (selects,joins) =
+  let
+    subquery = readRequestToQuery rr
+    aliasOrName = fromMaybe name alias
+    locTblName = qiName (relTable rel) <> "_" <> aliasOrName
+    localTableName = pgFmtIdent locTblName
+    internalTableName = pgFmtIdent $ "_" <> locTblName
+    correlatedSubquery sub al cond =
+      (if joinType == Just JTInner then "INNER" else "LEFT") <> " JOIN LATERAL ( " <> sub <> " ) AS " <> SQL.sql al <> " ON " <> cond
+    isToOne = case rel of
+      Relationship{relCardinality=M2O _ _} -> True
+      Relationship{relCardinality=O2O _ _} -> True
+      ComputedRelationship{relToOne=True}  -> True
+      _                                    -> False
+    (sel, joi) = if isToOne
+      then
+        ( SQL.sql ("row_to_json(" <> localTableName <> ".*) AS " <> pgFmtIdent aliasOrName)
+        , correlatedSubquery subquery localTableName "TRUE")
+      else
+        ( SQL.sql $ "COALESCE( " <> localTableName <> "." <> internalTableName <> ", '[]') AS " <> pgFmtIdent aliasOrName
+        , correlatedSubquery (
+            "SELECT json_agg(" <> SQL.sql internalTableName <> ") AS " <> SQL.sql internalTableName <>
+            "FROM (" <> subquery <> " ) AS " <> SQL.sql internalTableName
+          ) localTableName $ if joinType == Just JTInner then SQL.sql localTableName <> " IS NOT NULL" else "TRUE")
+  in
+  (sel:selects, joi:joins)

 mutateRequestToQuery :: MutateRequest -> SQL.Snippet
 mutateRequestToQuery (Insert mainQi iCols body onConflct putConditions returnings) =
@@ -105,28 +107,66 @@ mutateRequestToQuery (Insert mainQi iCols body onConflct putConditions returning
    ])
  where
    cols = BS.intercalate ", " $ pgFmtIdent <$> S.toList iCols
-mutateRequestToQuery (Update mainQi uCols body logicForest returnings) =
-  if S.null uCols
+
+-- An update without a limit is always filtered with a WHERE
+mutateRequestToQuery (Update mainQi uCols body logicForest range ordts returnings)
+  | S.null uCols =
    -- if there are no columns we cannot do UPDATE table SET {empty}, it'd be invalid syntax
    -- selecting an empty resultset from mainQi gives us the column names to prevent errors when using &select=
    -- the select has to be based on "returnings" to make computed overloaded functions not throw
-    then SQL.sql ("SELECT " <> emptyBodyReturnedColumns <> " FROM " <> fromQi mainQi <> " WHERE false")
-    else
-      "WITH " <> normalizedBody body <> " " <>
-      "UPDATE " <> SQL.sql (fromQi mainQi) <> " SET " <> SQL.sql cols <> " " <>
-      "FROM (SELECT * FROM json_populate_recordset (null::" <> SQL.sql (fromQi mainQi) <> " , " <> SQL.sql selectBody <> " )) _ " <>
-      (if null logicForest then mempty else "WHERE " <> intercalateSnippet " AND " (pgFmtLogicTree mainQi <$> logicForest)) <> " " <>
-      SQL.sql (returningF mainQi returnings)
+    SQL.sql $ "SELECT " <> emptyBodyReturnedColumns <> " FROM " <> fromQi mainQi <> " WHERE false"
+
+  | range == allRange =
+    "WITH " <> normalizedBody body <> " " <>
+    "UPDATE " <> mainTbl <> " SET " <> SQL.sql nonRangeCols <> " " <>
+    "FROM (SELECT * FROM json_populate_recordset (null::" <> mainTbl <> " , " <> SQL.sql selectBody <> " )) _ " <>
+    whereLogic <> " " <>
+    SQL.sql (returningF mainQi returnings)
+
+  | otherwise =
+    "WITH " <> normalizedBody body <> ", " <>
+    "pgrst_update_body AS (SELECT * FROM json_populate_recordset (null::" <> mainTbl <> " , " <> SQL.sql selectBody <> " ) LIMIT 1), " <>
+    "pgrst_affected_rows AS (" <>
+      "SELECT " <> SQL.sql rangeIdF <> " FROM " <> mainTbl <>
+      whereLogic <> " " <>
+      orderF mainQi ordts <> " " <>
+      limitOffsetF range <>
+    ") " <>
+    "UPDATE " <> mainTbl <> " SET " <> SQL.sql rangeCols <>
+    "FROM pgrst_affected_rows " <>
+    "WHERE " <> SQL.sql whereRangeIdF <> " " <>
+    SQL.sql (returningF mainQi returnings)
+
  where
-    cols = BS.intercalate ", " (pgFmtIdent <> const " = _." <> pgFmtIdent <$> S.toList uCols)
-    emptyBodyReturnedColumns :: SqlFragment
-    emptyBodyReturnedColumns
-      | null returnings = "NULL"
-      | otherwise       = BS.intercalate ", " (pgFmtColumn (QualifiedIdentifier mempty $ qiName mainQi) <$> returnings)
-mutateRequestToQuery (Delete mainQi logicForest returnings) =
-  "DELETE FROM " <> SQL.sql (fromQi mainQi) <> " " <>
-  (if null logicForest then mempty else "WHERE " <> intercalateSnippet " AND " (map (pgFmtLogicTree mainQi) logicForest)) <> " " <>
-  SQL.sql (returningF mainQi returnings)
+    whereLogic = if null logicForest then mempty else " WHERE " <> intercalateSnippet " AND " (pgFmtLogicTree mainQi <$> logicForest)
+    mainTbl = SQL.sql (fromQi mainQi)
+    emptyBodyReturnedColumns = if null returnings then "NULL" else BS.intercalate ", " (pgFmtColumn (QualifiedIdentifier mempty $ qiName mainQi) <$> returnings)
+    nonRangeCols = BS.intercalate ", " (pgFmtIdent <> const " = _." <> pgFmtIdent <$> S.toList uCols)
+    rangeCols = BS.intercalate ", " ((\col -> pgFmtIdent col <> " = (SELECT " <> pgFmtIdent col <> " FROM pgrst_update_body) ") <$> S.toList uCols)
+    (whereRangeIdF, rangeIdF) = mutRangeF mainQi (fst . otTerm <$> ordts)
+
+mutateRequestToQuery (Delete mainQi logicForest range ordts returnings)
+  | range == allRange =
+    "DELETE FROM " <> SQL.sql (fromQi mainQi) <> " " <>
+    whereLogic <> " " <>
+    SQL.sql (returningF mainQi returnings)
+
+  | otherwise =
+    "WITH " <>
+    "pgrst_affected_rows AS (" <>
+      "SELECT " <> SQL.sql rangeIdF <> " FROM " <> SQL.sql (fromQi mainQi) <>
+       whereLogic <> " " <>
+      orderF mainQi ordts <> " " <>
+      limitOffsetF range <>
+    ") " <>
+    "DELETE FROM " <> SQL.sql (fromQi mainQi) <> " " <>
+    "USING pgrst_affected_rows " <>
+    "WHERE " <> SQL.sql whereRangeIdF <> " " <>
+    SQL.sql (returningF mainQi returnings)
+
+  where
+    whereLogic = if null logicForest then mempty else " WHERE " <> intercalateSnippet " AND " (pgFmtLogicTree mainQi <$> logicForest)
+    (whereRangeIdF, rangeIdF) = mutRangeF mainQi (fst . otTerm <$> ordts)

 requestToCallProcQuery :: CallRequest -> SQL.Snippet
 requestToCallProcQuery (FunctionCall qi params args returnsScalar multipleCall returnings) =
@@ -184,8 +224,8 @@ requestToCallProcQuery (FunctionCall qi params args returnsScalar multipleCall r
 -- See https://github.com/PostgREST/postgrest/issues/2009#issuecomment-977473031
 -- Only for the nodes that have an INNER JOIN linked to the root level.
 readRequestToCountQuery :: ReadRequest -> SQL.Snippet
-readRequestToCountQuery (Node (Select{from=qi, implicitJoins=implJoins, where_=logicForest, joinConditions=joinConditions_}, _) forest) =
-  "SELECT 1 FROM " <> SQL.sql (BS.intercalate ", " (fromQi qi:(fromQi <$> implJoins))) <>
+readRequestToCountQuery (Node (Select{from=mainQi, fromAlias=tblAlias, where_=logicForest, joinConditions=joinConditions_}, (_, rel, _, _, _, _)) forest) =
+  "SELECT 1 " <> fromFrag <>
  (if null logicForest && null joinConditions_ && null subQueries
    then mempty
    else " WHERE " ) <>
@@ -195,12 +235,31 @@ readRequestToCountQuery (Node (Select{from=qi, implicitJoins=implJoins, where_=l
    subQueries
  )
  where
+    qi = getQualifiedIdentifier rel mainQi tblAlias
+    fromFrag = fromF rel mainQi tblAlias
    subQueries = foldr existsSubquery [] forest
    existsSubquery :: ReadRequest -> [SQL.Snippet] -> [SQL.Snippet]
    existsSubquery readReq@(Node (_, (_, _, _, _, joinType, _)) _) rest =
      if joinType == Just JTInner
        then ("EXISTS (" <> readRequestToCountQuery readReq <> " )"):rest
-        else mempty
+        else rest

 limitedQuery :: SQL.Snippet -> Maybe Integer -> SQL.Snippet
 limitedQuery query maxRows = query <> SQL.sql (maybe mempty (\x -> " LIMIT " <> BS.pack (show x)) maxRows)
+
+-- TODO refactor so this function is uneeded and ComputedRelationship QualifiedIdentifier comes from the ReadQuery type
+getQualifiedIdentifier :: Maybe Relationship -> QualifiedIdentifier -> Maybe Alias -> QualifiedIdentifier
+getQualifiedIdentifier rel mainQi tblAlias = case rel of
+  Just ComputedRelationship{relFunction} -> QualifiedIdentifier mempty $ fromMaybe (qiName relFunction) tblAlias
+  _                                      -> maybe mainQi (QualifiedIdentifier mempty) tblAlias
+
+-- FROM clause plus implicit joins
+fromF :: Maybe Relationship -> QualifiedIdentifier -> Maybe Alias -> SQL.Snippet
+fromF rel mainQi tblAlias = SQL.sql $ "FROM " <>
+  (case rel of
+    Just ComputedRelationship{relFunction,relTable} -> fromQi relFunction <> "(" <> pgFmtIdent (qiName relTable) <> ")"
+    _                                               -> fromQi mainQi) <>
+  maybe mempty (\a -> " AS " <> pgFmtIdent a) tblAlias <>
+  (case rel of
+    Just Relationship{relCardinality=M2M Junction{junTable=jt}} -> ", " <> fromQi jt
+    _                                                           -> mempty)
@@ -11,17 +11,20 @@ module PostgREST.Query.SqlFragment
  , SqlFragment
  , asBinaryF
  , asCsvF
+  , asGeoJsonF
  , asJsonF
  , asJsonSingleF
+  , asXmlF
  , countF
  , fromQi
-  , ftsOperators
  , limitOffsetF
  , locationF
+  , mutRangeF
  , normalizedBody
-  , operators
+  , orderF
  , pgFmtColumn
  , pgFmtIdent
+  , pgFmtIdentList
  , pgFmtJoinCondition
  , pgFmtLogicTree
  , pgFmtOrderTerm
@@ -34,11 +37,11 @@ module PostgREST.Query.SqlFragment
  , sourceCTEName
  , unknownEncoder
  , intercalateSnippet
+  , explainF
  ) where

 import qualified Data.ByteString.Char8           as BS
 import qualified Data.ByteString.Lazy            as LBS
-import qualified Data.HashMap.Strict             as M
 import qualified Data.Text                       as T
 import qualified Hasql.DynamicStatements.Snippet as SQL
 import qualified Hasql.Encoders                  as HE
@@ -48,9 +51,13 @@ import Text.InterpolatedString.Perl6 (qc)

 import PostgREST.DbStructure.Identifiers (FieldName,
                                          QualifiedIdentifier (..))
+import PostgREST.MediaType               (MTPlanFormat (..),
+                                          MTPlanOption (..))
 import PostgREST.RangeQuery              (NonnegRange, allRange,
                                          rangeLimit, rangeOffset)
+import PostgREST.Request.ReadQuery       (SelectItem)
 import PostgREST.Request.Types           (Alias, Field, Filter (..),
+                                          FtsOperator (..),
                                          JoinCondition (..),
                                          JsonOperand (..),
                                          JsonOperation (..),
@@ -60,7 +67,8 @@ import PostgREST.Request.Types           (Alias, Field, Filter (..),
                                          Operation (..),
                                          OrderDirection (..),
                                          OrderNulls (..),
-                                          OrderTerm (..), SelectItem,
+                                          OrderTerm (..),
+                                          SimpleOperator (..),
                                          TrileanVal (..))

 import Protolude hiding (cast)
@@ -75,34 +83,33 @@ noLocationF = "array[]::text[]"
 sourceCTEName :: SqlFragment
 sourceCTEName = "pgrst_source"

-operators :: M.HashMap Text SqlFragment
-operators = M.union (M.fromList [
-  ("eq", "="),
-  ("gte", ">="),
-  ("gt", ">"),
-  ("lte", "<="),
-  ("lt", "<"),
-  ("neq", "<>"),
-  ("like", "LIKE"),
-  ("ilike", "ILIKE"),
-  ("in", "IN"),
-  ("is", "IS"),
-  ("cs", "@>"),
-  ("cd", "<@"),
-  ("ov", "&&"),
-  ("sl", "<<"),
-  ("sr", ">>"),
-  ("nxr", "&<"),
-  ("nxl", "&>"),
-  ("adj", "-|-")]) ftsOperators
+singleValOperator :: SimpleOperator -> SqlFragment
+singleValOperator = \case
+  OpEqual            -> "="
+  OpGreaterThanEqual -> ">="
+  OpGreaterThan      -> ">"
+  OpLessThanEqual    -> "<="
+  OpLessThan         -> "<"
+  OpNotEqual         -> "<>"
+  OpLike             -> "like"
+  OpILike            -> "ilike"
+  OpContains         -> "@>"
+  OpContained        -> "<@"
+  OpOverlap          -> "&&"
+  OpStrictlyLeft     -> "<<"
+  OpStrictlyRight    -> ">>"
+  OpNotExtendsRight  -> "&<"
+  OpNotExtendsLeft   -> "&>"
+  OpAdjacent         -> "-|-"
+  OpMatch            -> "~"
+  OpIMatch           -> "~*"

-ftsOperators :: M.HashMap Text SqlFragment
-ftsOperators = M.fromList [
-  ("fts", "@@ to_tsquery"),
-  ("plfts", "@@ plainto_tsquery"),
-  ("phfts", "@@ phraseto_tsquery"),
-  ("wfts", "@@ websearch_to_tsquery")
-  ]
+ftsOperator :: FtsOperator -> SqlFragment
+ftsOperator = \case
+  FilterFts          -> "@@ to_tsquery"
+  FilterFtsPlain     -> "@@ plainto_tsquery"
+  FilterFtsPhrase    -> "@@ phraseto_tsquery"
+  FilterFtsWebsearch -> "@@ websearch_to_tsquery"

 -- |
 -- These CTEs convert a json object into a json array, this way we can use json_populate_recordset for all json payloads
@@ -153,6 +160,14 @@ pgFmtIdent x = encodeUtf8 $ "\"" <> T.replace "\"" "\"\"" (trimNullChars x) <> "
 trimNullChars :: Text -> Text
 trimNullChars = T.takeWhile (/= '\x0')

+-- |
+-- Format a list of identifiers and separate them by commas.
+--
+-- >>> pgFmtIdentList ["schema_1", "schema_2", "SPECIAL \"@/\\#~_-"]
+-- "\"schema_1\", \"schema_2\", \"SPECIAL \"\"@/\\#~_-\""
+pgFmtIdentList :: [Text] -> SqlFragment
+pgFmtIdentList schemas = BS.intercalate ", " $ pgFmtIdent <$> schemas
+
 asCsvF :: SqlFragment
 asCsvF = asCsvHeaderF <> " || '\n' || " <> asCsvBodyF
  where
@@ -172,10 +187,16 @@ asJsonF returnsScalar
  | returnsScalar = "coalesce(json_agg(_postgrest_t.pgrst_scalar), '[]')::character varying"
  | otherwise     = "coalesce(json_agg(_postgrest_t), '[]')::character varying"

-asJsonSingleF :: Bool -> SqlFragment --TODO! unsafe when the query actually returns multiple rows, used only on inserting and returning single element
+asJsonSingleF :: Bool -> SqlFragment
 asJsonSingleF returnsScalar
-  | returnsScalar = "coalesce(string_agg(to_json(_postgrest_t.pgrst_scalar)::text, ','), 'null')::character varying"
-  | otherwise     = "coalesce(string_agg(to_json(_postgrest_t)::text, ','), '')::character varying"
+  | returnsScalar = "coalesce((json_agg(_postgrest_t.pgrst_scalar)->0)::text, 'null')"
+  | otherwise     = "coalesce((json_agg(_postgrest_t)->0)::text, 'null')"
+
+asXmlF :: FieldName -> SqlFragment
+asXmlF fieldName = "coalesce(xmlagg(_postgrest_t." <> pgFmtIdent fieldName <> "), '')"
+
+asGeoJsonF ::  SqlFragment
+asGeoJsonF = "json_build_object('type', 'FeatureCollection', 'features', coalesce(json_agg(ST_AsGeoJSON(_postgrest_t)::json), '[]'))"

 asBinaryF :: FieldName -> SqlFragment
 asBinaryF fieldName = "coalesce(string_agg(_postgrest_t." <> pgFmtIdent fieldName <> ", ''), '')"
@@ -201,7 +222,10 @@ pgFmtColumn table "*" = fromQi table <> ".*"
 pgFmtColumn table c   = fromQi table <> "." <> pgFmtIdent c

 pgFmtField :: QualifiedIdentifier -> Field -> SQL.Snippet
-pgFmtField table (c, jp) = SQL.sql (pgFmtColumn table c) <> pgFmtJsonPath jp
+pgFmtField table (c, []) = SQL.sql (pgFmtColumn table c)
+-- Using to_jsonb instead of to_json to avoid missing operator errors when filtering:
+-- "operator does not exist: json = unknown"
+pgFmtField table (c, jp) = SQL.sql ("to_jsonb(" <> pgFmtColumn table c <> ")") <> pgFmtJsonPath jp

 pgFmtSelectItem :: QualifiedIdentifier -> SelectItem -> SQL.Snippet
 pgFmtSelectItem table (f@(fName, jp), Nothing, alias, _, _) = pgFmtField table f <> SQL.sql (pgFmtAs fName jp alias)
@@ -227,8 +251,8 @@ pgFmtOrderTerm qi ot =
 pgFmtFilter :: QualifiedIdentifier -> Filter -> SQL.Snippet
 pgFmtFilter table (Filter fld (OpExpr hasNot oper)) = notOp <> " " <> case oper of
   Op op val  -> pgFmtFieldOp op <> " " <> case op of
-     "like"  -> unknownLiteral (T.map star val)
-     "ilike" -> unknownLiteral (T.map star val)
+     OpLike  -> unknownLiteral (T.map star val)
+     OpILike -> unknownLiteral (T.map star val)
     _       -> unknownLiteral val

   -- IS cannot be prepared. `PREPARE boolplan AS SELECT * FROM projects where id IS $1` will give a syntax error.
@@ -249,11 +273,11 @@ pgFmtFilter table (Filter fld (OpExpr hasNot oper)) = notOp <> " " <> case oper
      _    -> "= ANY (" <> unknownLiteral (pgBuildArrayLiteral vals) <> ") "

   Fts op lang val ->
-     pgFmtFieldOp op <> "(" <> ftsLang lang <> unknownLiteral val <> ") "
+     pgFmtFieldFts op <> "(" <> ftsLang lang <> unknownLiteral val <> ") "
 where
   ftsLang = maybe mempty (\l -> unknownLiteral l <> ", ")
-   pgFmtFieldOp op = pgFmtField table fld <> " " <> sqlOperator op
-   sqlOperator o = SQL.sql $ M.lookupDefault "=" o operators
+   pgFmtFieldOp op = pgFmtField table fld <> " " <> SQL.sql (singleValOperator op)
+   pgFmtFieldFts op = pgFmtField table fld <> " " <> SQL.sql (ftsOperator op)
   notOp = if hasNot then "NOT" else mempty
   star c = if c == '*' then '%' else c

@@ -325,6 +349,17 @@ currentSettingF setting =
  -- nullif is used because of https://gist.github.com/steve-chavez/8d7033ea5655096903f3b52f8ed09a15
  "nullif(current_setting('" <> setting <> "', true), '')"

+mutRangeF :: QualifiedIdentifier -> [FieldName] -> (SqlFragment, SqlFragment)
+mutRangeF mainQi rangeId =
+  (
+    BS.intercalate " AND " $ (\col -> pgFmtColumn mainQi col <> " = " <> pgFmtColumn (QualifiedIdentifier mempty "pgrst_affected_rows") col) <$> rangeId
+  , BS.intercalate ", " (pgFmtColumn mainQi <$> rangeId)
+  )
+
+orderF :: QualifiedIdentifier -> [OrderTerm] -> SQL.Snippet
+orderF _ []    = mempty
+orderF qi ordts = "ORDER BY " <> intercalateSnippet ", " (pgFmtOrderTerm qi <$> ordts)
+
 -- Hasql Snippet utilities
 unknownEncoder :: ByteString -> SQL.Snippet
 unknownEncoder = SQL.encoderAndParam (HE.nonNullable HE.unknown)
@@ -335,3 +370,19 @@ unknownLiteral = unknownEncoder . encodeUtf8
 intercalateSnippet :: ByteString -> [SQL.Snippet] -> SQL.Snippet
 intercalateSnippet _ [] = mempty
 intercalateSnippet frag snippets = foldr1 (\a b -> a <> SQL.sql frag <> b) snippets
+
+explainF :: MTPlanFormat -> [MTPlanOption] -> SQL.Snippet -> SQL.Snippet
+explainF fmt opts snip =
+  "EXPLAIN (" <>
+    SQL.sql (BS.intercalate ", " (fmtPlanFmt fmt : (fmtPlanOpt <$> opts))) <>
+  ") " <> snip
+  where
+    fmtPlanOpt :: MTPlanOption -> BS.ByteString
+    fmtPlanOpt PlanAnalyze  = "ANALYZE"
+    fmtPlanOpt PlanVerbose  = "VERBOSE"
+    fmtPlanOpt PlanSettings = "SETTINGS"
+    fmtPlanOpt PlanBuffers  = "BUFFERS"
+    fmtPlanOpt PlanWAL      = "WAL"
+
+    fmtPlanFmt PlanJSON = "FORMAT JSON"
+    fmtPlanFmt PlanText = "FORMAT TEXT"
@@ -6,14 +6,13 @@ This module constructs single SQL statements that can be parametrized and prepar

 - It consumes the SqlQuery types generated by the QueryBuilder module.
 - It generates the body format and some headers of the final HTTP response.
-
-TODO: Currently, createReadStatement is not using prepared statements. See https://github.com/PostgREST/postgrest/issues/718.
 -}
 module PostgREST.Query.Statements
-  ( createWriteStatement
-  , createReadStatement
-  , callProcStatement
-  , createExplainStatement
+  ( prepareWrite
+  , prepareRead
+  , prepareCall
+  , preparePlanRows
+  , ResultSet (..)
  ) where

 import qualified Data.Aeson                        as JSON
@@ -34,22 +33,39 @@ import PostgREST.Error     (Error (..))
 import PostgREST.GucHeader (GucHeader)

 import PostgREST.DbStructure.Identifiers (FieldName)
+import PostgREST.MediaType               (MTPlanAttrs (..),
+                                          MTPlanFormat (..),
+                                          MediaType (..),
+                                          getMediaType)
 import PostgREST.Query.SqlFragment
 import PostgREST.Request.Preferences

 import Protolude

-{-| The generic query result format used by API responses. The location header
-    is represented as a list of strings containing variable bindings like
-    @"k1=eq.42"@, or the empty list if there is no location header.
-}
-type ResultsWithCount = (Maybe Int64, Int64, [BS.ByteString], BS.ByteString, Either Error [GucHeader], Either Error (Maybe Status))
+-- | Standard result set format used for all queries
+data ResultSet
+  = RSStandard
+  { rsTableTotal :: Maybe Int64
+  -- ^ count of all the table rows
+  , rsQueryTotal :: Int64
+  -- ^ count of the query rows
+  , rsLocation   :: [(BS.ByteString, BS.ByteString)]
+  -- ^ The Location header(only used for inserts) is represented as a list of strings containing
+  -- variable bindings like @"k1=eq.42"@, or the empty list if there is no location header.
+  , rsBody       :: BS.ByteString
+  -- ^ the aggregated body of the query
+  , rsGucHeaders :: Either Error [GucHeader]
+  -- ^ the HTTP headers to be added to the response
+  , rsGucStatus  :: Either Error (Maybe Status)
+  -- ^ the HTTP status to be added to the response
+  }
+  | RSPlan BS.ByteString -- ^ the plan of the query

-createWriteStatement :: SQL.Snippet -> SQL.Snippet -> Bool -> Bool -> Bool ->
-                        PreferRepresentation -> [Text] -> Bool ->
-                        SQL.Statement () ResultsWithCount
-createWriteStatement selectQuery mutateQuery wantSingle isInsert asCsv rep pKeys =
-  SQL.dynamicallyParameterized snippet decodeStandard
+
+prepareWrite :: SQL.Snippet -> SQL.Snippet -> Bool -> MediaType ->
+                PreferRepresentation -> [Text] -> Bool -> SQL.Statement () ResultSet
+prepareWrite selectQuery mutateQuery isInsert mt rep pKeys =
+  SQL.dynamicallyParameterized (mtSnippet mt snippet) decodeIt
 where
  snippet =
    "WITH " <> SQL.sql sourceCTEName <> " AS (" <> mutateQuery <> ") " <>
@@ -65,7 +81,7 @@ createWriteStatement selectQuery mutateQuery wantSingle isInsert asCsv rep pKeys
    "FROM (" <> selectF <> ") _postgrest_t"

  locF =
-    if isInsert && rep `elem` [Full, HeadersOnly]
+    if isInsert && rep == HeadersOnly
      then BS.unwords [
        "CASE WHEN pg_catalog.count(_postgrest_t) = 1",
          "THEN coalesce(" <> locationF pKeys <> ", " <> noLocationF <> ")",
@@ -74,24 +90,25 @@ createWriteStatement selectQuery mutateQuery wantSingle isInsert asCsv rep pKeys
      else noLocationF

  bodyF
-    | rep `elem` [None, HeadersOnly] = "''"
-    | asCsv = asCsvF
-    | wantSingle = asJsonSingleF False
-    | otherwise = asJsonF False
+    | rep /= Full                       = "''"
+    | getMediaType mt == MTTextCSV      = asCsvF
+    | getMediaType mt == MTGeoJSON      = asGeoJsonF
+    | getMediaType mt == MTSingularJSON = asJsonSingleF False
+    | otherwise                         = asJsonF False

  selectF
    -- prevent using any of the column names in ?select= when no response is returned from the CTE
-    | rep `elem` [None, HeadersOnly] = SQL.sql ("SELECT * FROM " <> sourceCTEName)
-    | otherwise                      = selectQuery
+    | rep /= Full = SQL.sql ("SELECT * FROM " <> sourceCTEName)
+    | otherwise   = selectQuery

-  decodeStandard :: HD.Result ResultsWithCount
-  decodeStandard =
-   fromMaybe (Nothing, 0, [], mempty, Right [], Right Nothing) <$> HD.rowMaybe standardRow
+  decodeIt :: HD.Result ResultSet
+  decodeIt = case mt of
+    MTPlan{} -> planRow
+    _        -> fromMaybe (RSStandard Nothing 0 mempty mempty (Right []) (Right Nothing)) <$> HD.rowMaybe (standardRow False)

-createReadStatement :: SQL.Snippet -> SQL.Snippet -> Bool -> Bool -> Bool -> Maybe FieldName -> Bool ->
-                       SQL.Statement () ResultsWithCount
-createReadStatement selectQuery countQuery isSingle countTotal asCsv binaryField =
-  SQL.dynamicallyParameterized snippet decodeStandard
+prepareRead :: SQL.Snippet -> SQL.Snippet -> Bool -> MediaType -> Maybe FieldName -> Bool -> SQL.Statement () ResultSet
+prepareRead selectQuery countQuery countTotal mt binaryField =
+  SQL.dynamicallyParameterized (mtSnippet mt snippet) decodeIt
 where
  snippet =
    "WITH " <>
@@ -100,7 +117,6 @@ createReadStatement selectQuery countQuery isSingle countTotal asCsv binaryField
    SQL.sql ("SELECT " <>
      countResultF <> " AS total_result_set, " <>
      "pg_catalog.count(_postgrest_t) AS page_total, " <>
-      noLocationF <> " AS header, " <>
      bodyF <> " AS body, " <>
      responseHeadersF <> " AS response_headers, " <>
      responseStatusF <> " AS response_status " <>
@@ -109,32 +125,23 @@ createReadStatement selectQuery countQuery isSingle countTotal asCsv binaryField
  (countCTEF, countResultF) = countF countQuery countTotal

  bodyF
-    | asCsv = asCsvF
-    | isSingle = asJsonSingleF False
-    | isJust binaryField = asBinaryF $ fromJust binaryField
-    | otherwise = asJsonF False
+    | getMediaType mt == MTTextCSV                       = asCsvF
+    | getMediaType mt == MTSingularJSON                  = asJsonSingleF False
+    | getMediaType mt == MTGeoJSON                       = asGeoJsonF
+    | isJust binaryField && getMediaType mt == MTTextXML = asXmlF $ fromJust binaryField
+    | isJust binaryField                                 = asBinaryF $ fromJust binaryField
+    | otherwise                                          = asJsonF False

-  decodeStandard :: HD.Result ResultsWithCount
-  decodeStandard =
-    HD.singleRow standardRow
+  decodeIt :: HD.Result ResultSet
+  decodeIt = case mt of
+    MTPlan{} -> planRow
+    _        -> HD.singleRow $ standardRow True

-{-| Read and Write api requests use a similar response format which includes
-    various record counts and possible location header. This is the decoder
-    for that common type of query.
-}
-standardRow :: HD.Row ResultsWithCount
-standardRow = (,,,,,) <$> nullableColumn HD.int8 <*> column HD.int8
-                      <*> arrayColumn HD.bytea <*> column HD.bytea
-                      <*> (fromMaybe (Right []) <$> nullableColumn decodeGucHeaders)
-                      <*> (fromMaybe (Right Nothing) <$> nullableColumn decodeGucStatus)
-
-type ProcResults = (Maybe Int64, Int64, ByteString, Either Error [GucHeader], Either Error (Maybe Status))
-
-callProcStatement :: Bool -> Bool -> SQL.Snippet -> SQL.Snippet -> SQL.Snippet -> Bool ->
-                     Bool -> Bool -> Bool -> Maybe FieldName -> Bool ->
-                     SQL.Statement () ProcResults
-callProcStatement returnsScalar returnsSingle callProcQuery selectQuery countQuery countTotal asSingle asCsv multObjects binaryField =
-  SQL.dynamicallyParameterized snippet decodeProc
+prepareCall :: Bool -> Bool -> SQL.Snippet -> SQL.Snippet -> SQL.Snippet -> Bool ->
+               MediaType -> Bool -> Maybe FieldName -> Bool ->
+               SQL.Statement () ResultSet
+prepareCall returnsScalar returnsSingle callProcQuery selectQuery countQuery countTotal mt multObjects binaryField =
+  SQL.dynamicallyParameterized (mtSnippet mt snippet) decodeIt
  where
    snippet =
      "WITH " <> SQL.sql sourceCTEName <> " AS (" <> callProcQuery <> ") " <>
@@ -151,42 +158,50 @@ callProcStatement returnsScalar returnsSingle callProcQuery selectQuery countQue
    (countCTEF, countResultF) = countF countQuery countTotal

    bodyF
-     | asSingle           = asJsonSingleF returnsScalar
-     | asCsv              = asCsvF
-     | isJust binaryField = asBinaryF $ fromJust binaryField
-     | returnsSingle
-       && not multObjects = asJsonSingleF returnsScalar
-     | otherwise          = asJsonF returnsScalar
+     | getMediaType mt == MTSingularJSON                  = asJsonSingleF returnsScalar
+     | getMediaType mt == MTTextCSV                       = asCsvF
+     | getMediaType mt == MTGeoJSON                       = asGeoJsonF
+     | isJust binaryField && getMediaType mt == MTTextXML = asXmlF $ fromJust binaryField
+     | isJust binaryField                                 = asBinaryF $ fromJust binaryField
+     | returnsSingle && not multObjects                   = asJsonSingleF returnsScalar
+     | otherwise                                          = asJsonF returnsScalar

-    decodeProc :: HD.Result ProcResults
-    decodeProc =
-      fromMaybe (Just 0, 0, mempty, defGucHeaders, defGucStatus) <$> HD.rowMaybe procRow
-      where
-        defGucHeaders = Right []
-        defGucStatus  = Right Nothing
-        procRow = (,,,,) <$> nullableColumn HD.int8 <*> column HD.int8
-                         <*> column HD.bytea
-                         <*> (fromMaybe defGucHeaders <$> nullableColumn decodeGucHeaders)
-                         <*> (fromMaybe defGucStatus <$> nullableColumn decodeGucStatus)
+    decodeIt :: HD.Result ResultSet
+    decodeIt = case mt of
+      MTPlan{} -> planRow
+      _        -> fromMaybe (RSStandard (Just 0) 0 mempty mempty (Right []) (Right Nothing)) <$> HD.rowMaybe (standardRow True)

-createExplainStatement :: SQL.Snippet -> Bool -> SQL.Statement () (Maybe Int64)
-createExplainStatement countQuery =
-  SQL.dynamicallyParameterized snippet decodeExplain
+preparePlanRows :: SQL.Snippet -> Bool -> SQL.Statement () (Maybe Int64)
+preparePlanRows countQuery =
+  SQL.dynamicallyParameterized snippet decodeIt
  where
-    snippet = "EXPLAIN (FORMAT JSON) " <> countQuery
-    -- |
-    -- An `EXPLAIN (FORMAT JSON) select * from items;` output looks like this:
-    -- [{
-    --   "Plan": {
-    --     "Node Type": "Seq Scan", "Parallel Aware": false, "Relation Name": "items",
-    --     "Alias": "items", "Startup Cost": 0.00, "Total Cost": 32.60,
-    --     "Plan Rows": 2260,"Plan Width": 8} }]
-    -- We only obtain the Plan Rows here.
-    decodeExplain :: HD.Result (Maybe Int64)
-    decodeExplain =
+    snippet = explainF PlanJSON mempty countQuery
+    decodeIt :: HD.Result (Maybe Int64)
+    decodeIt =
      let row = HD.singleRow $ column HD.bytea in
      (^? L.nth 0 . L.key "Plan" .  L.key "Plan Rows" . L._Integral) <$> row

+standardRow :: Bool -> HD.Row ResultSet
+standardRow noLocation =
+  RSStandard <$> nullableColumn HD.int8 <*> column HD.int8
+             <*> (if noLocation then pure mempty else fmap splitKeyValue <$> arrayColumn HD.bytea) <*> column HD.bytea
+             <*> (fromMaybe (Right []) <$> nullableColumn decodeGucHeaders)
+             <*> (fromMaybe (Right Nothing) <$> nullableColumn decodeGucStatus)
+  where
+    splitKeyValue :: ByteString -> (ByteString, ByteString)
+    splitKeyValue kv =
+      let (k, v) = BS.break (== '=') kv in
+      (k, BS.tail v)
+
+mtSnippet :: MediaType -> SQL.Snippet -> SQL.Snippet
+mtSnippet mediaType snippet = case mediaType of
+  MTPlan (MTPlanAttrs _ fmt opts) -> explainF fmt opts snippet
+  _                               -> snippet
+
+-- | We use rowList because when doing EXPLAIN (FORMAT TEXT), the result comes as many rows. FORMAT JSON comes as one.
+planRow :: HD.Result ResultSet
+planRow = RSPlan . BS.unlines <$> HD.rowList (column HD.bytea)
+
 decodeGucHeaders :: HD.Value (Either Error [GucHeader])
 decodeGucHeaders = first (const GucHeadersError) . JSON.eitherDecode . LBS.fromStrict <$> HD.bytea

@@ -10,6 +10,8 @@ module PostgREST.RangeQuery (
 , restrictRange
 , rangeGeq
 , allRange
+, limitZeroRange
+, hasLimitZero
 , NonnegRange
 , rangeStatusHeader
 , contentRangeH
@@ -34,13 +36,14 @@ rangeParse :: BS.ByteString -> NonnegRange
 rangeParse range = do
  let rangeRegex = "^([0-9]+)-([0-9]*)$" :: BS.ByteString

-  case listToMaybe (range =~ rangeRegex :: [[BS.ByteString]]) of
-    Just parsedRange ->
-      let [_, mLower, mUpper] = readMaybe . BS.unpack <$> parsedRange
-          lower         = maybe emptyRange rangeGeq mLower
-          upper         = maybe allRange rangeLeq mUpper in
+  case range =~ rangeRegex :: [[BS.ByteString]] of
+    [[_, l, u]] ->
+      let lower  = maybe emptyRange rangeGeq (readInteger l)
+          upper  = maybe allRange rangeLeq (readInteger u) in
      rangeIntersection lower upper
-    Nothing -> allRange
+    _ -> allRange
+  where
+    readInteger = readMaybe . BS.unpack

 rangeRequested :: RequestHeaders -> NonnegRange
 rangeRequested headers = maybe allRange rangeParse $ lookup hRange headers
@@ -74,6 +77,15 @@ rangeLeq :: Integer -> NonnegRange
 rangeLeq n =
  Range BoundaryBelowAll (BoundaryAbove n)

+-- Special case to allow limit 0 queries
+-- https://github.com/PostgREST/postgrest/issues/1121
+-- 0 <= x <= -1
+limitZeroRange :: Range Integer
+limitZeroRange = Range (BoundaryBelow 0) (BoundaryAbove (-1))
+
+hasLimitZero :: Range Integer -> Bool
+hasLimitZero r = rangeUpper r == rangeUpper limitZeroRange
+
 rangeStatusHeader :: NonnegRange -> Int64 -> Maybe Int64 -> (Status, Header)
 rangeStatusHeader topLevelRange queryTotal tableTotal =
  let lower = rangeOffset topLevelRange
@@ -9,7 +9,8 @@ Description : PostgREST functions to translate HTTP request to a domain type cal
 module PostgREST.Request.ApiRequest
  ( ApiRequest(..)
  , InvokeMethod(..)
-  , ContentType(..)
+  , Mutation(..)
+  , MediaType(..)
  , Action(..)
  , Target(..)
  , Payload(..)
@@ -17,57 +18,57 @@ module PostgREST.Request.ApiRequest
  ) where

 import qualified Data.Aeson            as JSON
+import qualified Data.Aeson.Key        as K
+import qualified Data.Aeson.KeyMap     as KM
 import qualified Data.ByteString.Char8 as BS
 import qualified Data.ByteString.Lazy  as LBS
 import qualified Data.CaseInsensitive  as CI
 import qualified Data.Csv              as CSV
-import qualified Data.HashMap.Strict   as M
+import qualified Data.HashMap.Strict   as HM
 import qualified Data.List             as L
 import qualified Data.List.NonEmpty    as NonEmptyList
+import qualified Data.Map.Strict       as M
 import qualified Data.Set              as S
-import qualified Data.Text             as T
 import qualified Data.Text.Encoding    as T
 import qualified Data.Vector           as V

 import Control.Arrow             ((***))
 import Data.Aeson.Types          (emptyArray, emptyObject)
-import Data.List                 (last, lookup, partition, union)
+import Data.List                 (lookup, union)
 import Data.Maybe                (fromJust)
-import Data.Ranged.Boundaries    (Boundary (..))
-import Data.Ranged.Ranges        (Range (..), emptyRange,
-                                  rangeIntersection)
-import Network.HTTP.Base         (urlEncodeVars)
-import Network.HTTP.Types.Header (hAuthorization, hCookie)
-import Network.HTTP.Types.URI    (parseQueryReplacePlus,
-                                  parseSimpleQuery)
+import Data.Ranged.Ranges        (emptyRange, rangeIntersection)
+import Network.HTTP.Types.Header (hCookie)
+import Network.HTTP.Types.URI    (parseSimpleQuery)
 import Network.Wai               (Request (..))
 import Network.Wai.Parse         (parseHttpAccept)
 import Web.Cookie                (parseCookies)

 import PostgREST.Config                  (AppConfig (..),
                                          OpenAPIMode (..))
-import PostgREST.ContentType             (ContentType (..))
 import PostgREST.DbStructure             (DbStructure (..))
 import PostgREST.DbStructure.Identifiers (FieldName,
                                          QualifiedIdentifier (..),
                                          Schema)
 import PostgREST.DbStructure.Proc        (ProcDescription (..),
                                          ProcParam (..), ProcsMap)
-import PostgREST.Error                   (ApiRequestError (..))
-import PostgREST.Query.SqlFragment       (ftsOperators, operators)
+import PostgREST.MediaType               (MTPlanAttrs (..),
+                                          MTPlanFormat (..),
+                                          MediaType (..))
 import PostgREST.RangeQuery              (NonnegRange, allRange,
-                                          rangeGeq, rangeLimit,
-                                          rangeOffset, rangeRequested,
-                                          restrictRange)
-import PostgREST.Request.Parsers         (pRequestColumns)
+                                          hasLimitZero,
+                                          limitZeroRange,
+                                          rangeRequested)
 import PostgREST.Request.Preferences     (PreferCount (..),
                                          PreferParameters (..),
                                          PreferRepresentation (..),
                                          PreferResolution (..),
                                          PreferTransaction (..))
+import PostgREST.Request.QueryParams     (QueryParams (..))
+import PostgREST.Request.Types           (ApiRequestError (..))

-import qualified PostgREST.ContentType         as ContentType
+import qualified PostgREST.MediaType           as MediaType
 import qualified PostgREST.Request.Preferences as Preferences
+import qualified PostgREST.Request.QueryParams as QueryParams

 import Protolude

@@ -89,27 +90,28 @@ data Payload
  | RawPay  { payRaw  :: LBS.ByteString }

 data InvokeMethod = InvHead | InvGet | InvPost deriving Eq
+data Mutation = MutationCreate | MutationDelete | MutationSingleUpsert | MutationUpdate deriving Eq
+
 -- | Types of things a user wants to do to tables/views/procs
-data Action = ActionCreate       | ActionRead{isHead :: Bool}
-            | ActionUpdate       | ActionDelete
-            | ActionSingleUpsert | ActionInvoke InvokeMethod
-            | ActionInfo         | ActionInspect{isHead :: Bool}
-            deriving Eq
+data Action
+  = ActionMutate Mutation
+  | ActionRead {isHead :: Bool}
+  | ActionInvoke InvokeMethod
+  | ActionInfo
+  | ActionInspect {isHead :: Bool}
+  deriving Eq
 -- | The path info that will be mapped to a target (used to handle validations and errors before defining the Target)
-data Path
+data PathInfo
  = PathInfo
-      { pSchema        :: Schema,
-        pName          :: Text,
-        pHasRpc        :: Bool,
-        pIsDefaultSpec :: Bool,
-        pIsRootSpec    :: Bool
+      { pathName       :: Text
+      , pathIsProc     :: Bool
+      , pathIsDefSpec  :: Bool
+      , pathIsRootSpec :: Bool
      }
-  | PathUnknown
 -- | The target db object of a user action
 data Target = TargetIdent QualifiedIdentifier
            | TargetProc{tProc :: ProcDescription, tpIsRootSpec :: Bool}
            | TargetDefaultSpec{tdsSchema :: Schema} -- The default spec offered at root "/"
-            | TargetUnknown

 -- | RPC query param value `/rpc/func?v=<value>`, used for VARIADIC functions on form-urlencoded POST and GETs
 -- | It can be fixed `?v=1` or repeated `?v=1&v=2&v=3.
@@ -128,10 +130,10 @@ toRpcParamValue proc (k, v) | prmIsVariadic k = (k, Variadic [v])
 jsonRpcParams :: ProcDescription -> [(Text, Text)] -> Payload
 jsonRpcParams proc prms =
  if not $ pdHasVariadic proc then -- if proc has no variadic param, save steps and directly convert to json
-    ProcessedJSON (JSON.encode $ M.fromList $ second JSON.toJSON <$> prms) (S.fromList $ fst <$> prms)
+    ProcessedJSON (JSON.encode $ HM.fromList $ second JSON.toJSON <$> prms) (S.fromList $ fst <$> prms)
  else
-    let paramsMap = M.fromListWith mergeParams $ toRpcParamValue proc <$> prms in
-    ProcessedJSON (JSON.encode paramsMap) (S.fromList $ M.keys paramsMap)
+    let paramsMap = HM.fromListWith mergeParams $ toRpcParamValue proc <$> prms in
+    ProcessedJSON (JSON.encode paramsMap) (S.fromList $ HM.keys paramsMap)
  where
    mergeParams :: RpcParamValue -> RpcParamValue -> RpcParamValue
    mergeParams (Variadic a) (Variadic b) = Variadic $ b ++ a
@@ -151,8 +153,8 @@ targetToJsonRpcParams target params =
  if it is an action we are able to perform.
 -}
 data ApiRequest = ApiRequest {
-    iAction               :: Action                           -- ^ Similar but not identical to HTTP verb, e.g. Create/Invoke both POST
-  , iRange                :: M.HashMap Text NonnegRange -- ^ Requested range of rows within response
+    iAction               :: Action                           -- ^ Similar but not identical to HTTP method, e.g. Create/Invoke both POST
+  , iRange                :: HM.HashMap Text NonnegRange      -- ^ Requested range of rows within response
  , iTopLevelRange        :: NonnegRange                      -- ^ Requested range of rows from the top level
  , iTarget               :: Target                           -- ^ The target, be it calling a proc or accessing a table
  , iPayload              :: Maybe Payload                    -- ^ Data sent by client and used for mutation actions
@@ -161,33 +163,67 @@ data ApiRequest = ApiRequest {
  , iPreferCount          :: Maybe PreferCount                -- ^ Whether the client wants a result count
  , iPreferResolution     :: Maybe PreferResolution           -- ^ Whether the client wants to UPSERT or ignore records on PK conflict
  , iPreferTransaction    :: Maybe PreferTransaction          -- ^ Whether the clients wants to commit or rollback the transaction
-  , iFilters              :: [(Text, Text)]                   -- ^ Filters on the result ("id", "eq.10")
-  , iLogic                :: [(Text, Text)]                   -- ^ &and and &or parameters used for complex boolean logic
-  , iSelect               :: Maybe Text                       -- ^ &select parameter used to shape the response
-  , iOnConflict           :: Maybe Text                       -- ^ &on_conflict parameter used to upsert on specific unique keys
+  , iQueryParams          :: QueryParams.QueryParams
  , iColumns              :: S.Set FieldName                  -- ^ parsed colums from &columns parameter and payload
-  , iOrder                :: [(Text, Text)]                   -- ^ &order parameters for each level
-  , iCanonicalQS          :: ByteString                       -- ^ Alphabetized (canonical) request query string for response URLs
-  , iJWT                  :: Text                             -- ^ JSON Web Token
  , iHeaders              :: [(ByteString, ByteString)]       -- ^ HTTP request headers
  , iCookies              :: [(ByteString, ByteString)]       -- ^ Request Cookies
  , iPath                 :: ByteString                       -- ^ Raw request path
  , iMethod               :: ByteString                       -- ^ Raw request method
  , iProfile              :: Maybe Schema                     -- ^ The request profile for enabling use of multiple schemas. Follows the spec in hhttps://www.w3.org/TR/dx-prof-conneg/ttps://www.w3.org/TR/dx-prof-conneg/.
  , iSchema               :: Schema                           -- ^ The request schema. Can vary depending on iProfile.
-  , iAcceptContentType    :: ContentType
+  , iAcceptMediaType      :: MediaType
  }

 -- | Examines HTTP request and translates it into user intent.
 userApiRequest :: AppConfig -> DbStructure -> Request -> RequestBody -> Either ApiRequestError ApiRequest
-userApiRequest conf@AppConfig{..} dbStructure req reqBody
+userApiRequest conf dbStructure req reqBody = do
+  qPrms <- first QueryParamError $ QueryParams.parse $ rawQueryString req
+  pInfo <- getPathInfo conf $ pathInfo req
+  act <- getAction pInfo $ requestMethod req
+  apiRequest conf dbStructure req reqBody qPrms pInfo act
+
+getPathInfo :: AppConfig -> [Text] -> Either ApiRequestError PathInfo
+getPathInfo AppConfig{configOpenApiMode, configDbRootSpec} path =
+  case path of
+    []             -> case configDbRootSpec of
+                        Just (QualifiedIdentifier _ pathName)     -> Right $ PathInfo pathName True False True
+                        Nothing | configOpenApiMode == OADisabled -> Left NotFound
+                                | otherwise                       -> Right $ PathInfo mempty False True False
+    [table]        -> Right $ PathInfo table False False False
+    ["rpc", pName] -> Right $ PathInfo pName True False False
+    _              -> Left NotFound
+
+getAction :: PathInfo -> ByteString -> Either ApiRequestError Action
+getAction PathInfo{pathIsProc, pathIsDefSpec} method =
+  if pathIsProc && method `notElem` ["HEAD", "GET", "POST", "OPTIONS"]
+    then Left $ InvalidRpcMethod method
+    else case method of
+      -- The HEAD method is identical to GET except that the server MUST NOT return a message-body in the response
+      -- From https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.4
+      "HEAD"     | pathIsDefSpec -> Right $ ActionInspect{isHead=True}
+                 | pathIsProc    -> Right $ ActionInvoke InvHead
+                 | otherwise     -> Right $ ActionRead{isHead=True}
+      "GET"      | pathIsDefSpec -> Right $ ActionInspect{isHead=False}
+                 | pathIsProc    -> Right $ ActionInvoke InvGet
+                 | otherwise     -> Right $ ActionRead{isHead=False}
+      "POST"     | pathIsProc    -> Right $ ActionInvoke InvPost
+                 | otherwise     -> Right $ ActionMutate MutationCreate
+      "PATCH"                    -> Right $ ActionMutate MutationUpdate
+      "PUT"                      -> Right $ ActionMutate MutationSingleUpsert
+      "DELETE"                   -> Right $ ActionMutate MutationDelete
+      "OPTIONS"                  -> Right ActionInfo
+      _                          -> Left $ UnsupportedMethod method
+
+apiRequest :: AppConfig -> DbStructure -> Request -> RequestBody -> QueryParams.QueryParams -> PathInfo -> Action -> Either ApiRequestError ApiRequest
+apiRequest conf@AppConfig{..} dbStructure req reqBody queryparams@QueryParams{..} path@PathInfo{pathName, pathIsProc, pathIsRootSpec, pathIsDefSpec} action
  | isJust profile && fromJust profile `notElem` configDbSchemas = Left $ UnacceptableSchema $ toList configDbSchemas
-  | isTargetingProc && method `notElem` ["HEAD", "GET", "POST"] = Left ActionInappropriate
-  | topLevelRange == emptyRange = Left InvalidRange
+  | isInvalidRange = Left InvalidRange
  | shouldParsePayload && isLeft payload = either (Left . InvalidBody) witness payload
-  | isLeft parsedColumns = either Left witness parsedColumns
+  | not expectParams && not (L.null qsParams) = Left $ ParseRequestError "Unexpected param or filter missing operator" ("Failed to parse " <> show qsParams)
+  | method `elem` ["PATCH", "DELETE"] && not (null qsRanges) && null qsOrder = Left LimitNoOrderError
+  | method == "PUT" && topLevelRange /= allRange = Left PutRangeNotAllowedError
  | otherwise = do
-     acceptContentType <- findAcceptContentType conf action path accepts
+     acceptMediaType <- findAcceptMediaType conf action path accepts
     checkedTarget <- target
     return ApiRequest {
      iAction = action
@@ -200,196 +236,128 @@ userApiRequest conf@AppConfig{..} dbStructure req reqBody
      , iPreferCount = preferCount
      , iPreferResolution = preferResolution
      , iPreferTransaction = preferTransaction
-      , iFilters = filters
-      , iLogic = [(toS k, toS $ fromJust v) | (k,v) <- qParams, isJust v, endingIn ["and", "or"] k ]
-      , iSelect = toS <$> join (lookup "select" qParams)
-      , iOnConflict = toS <$> join (lookup "on_conflict" qParams)
+      , iQueryParams = queryparams
      , iColumns = payloadColumns
-      , iOrder = [(toS k, toS $ fromJust v) | (k,v) <- qParams, isJust v, endingIn ["order"] k ]
-      , iCanonicalQS = BS.pack $ urlEncodeVars
-        . L.sortOn fst
-        . map (join (***) BS.unpack . second (fromMaybe mempty))
-        $ qString
-      , iJWT = tokenStr
      , iHeaders = [ (CI.foldedCase k, v) | (k,v) <- hdrs, k /= hCookie]
      , iCookies = maybe [] parseCookies $ lookupHeader "Cookie"
      , iPath = rawPathInfo req
      , iMethod = method
      , iProfile = profile
      , iSchema = schema
-      , iAcceptContentType = acceptContentType
+      , iAcceptMediaType = acceptMediaType
      }
 where
-  accepts = maybe [CTAny] (map ContentType.decodeContentType . parseHttpAccept) $ lookupHeader "accept"
-  -- queryString with '+' converted to ' '(space)
-  qString = parseQueryReplacePlus True $ rawQueryString req
-  -- rpcQParams = Rpc query params e.g. /rpc/name?param1=val1, similar to filter but with no operator(eq, lt..)
-  (filters, rpcQParams) =
-    case action of
-      ActionInvoke InvGet  -> partitionFlts
-      ActionInvoke InvHead -> partitionFlts
-      _                    -> (flts, [])
-  partitionFlts = partition (liftM2 (||) (isEmbedPath . fst) (hasOperator . snd)) flts
-  flts =
-    [ (toS k, toS $ fromJust v) |
-      (k,v) <- qParams, isJust v,
-      k `notElem` ["select", "columns"],
-      not (endingIn ["order", "limit", "offset", "and", "or"] k) ]
-  hasOperator val = any (`T.isPrefixOf` val) $
-                      ((<> ".") <$> "not":M.keys operators) ++
-                      ((<> "(") <$> M.keys ftsOperators)
-  isEmbedPath = T.isInfixOf "."
-  isTargetingProc = case path of
-    PathInfo{pHasRpc, pIsRootSpec} -> pHasRpc || pIsRootSpec
-    _                              -> False
-  isTargetingDefaultSpec = case path of
-    PathInfo{pIsDefaultSpec=True} -> True
-    _                             -> False
-  contentType = maybe CTApplicationJSON ContentType.decodeContentType $ lookupHeader "content-type"
-  columns
-    | action `elem` [ActionCreate, ActionUpdate, ActionInvoke InvPost] = toS <$> join (lookup "columns" qParams)
-    | otherwise = Nothing
-  parsedColumns = pRequestColumns columns
+  accepts = maybe [MTAny] (map MediaType.decodeMediaType . parseHttpAccept) $ lookupHeader "accept"
+
+  expectParams = pathIsProc && method /= "POST"
+
+  contentMediaType = maybe MTApplicationJSON MediaType.decodeMediaType $ lookupHeader "content-type"
+
+  columns = case action of
+    ActionMutate MutationCreate -> qsColumns
+    ActionMutate MutationUpdate -> qsColumns
+    ActionInvoke InvPost        -> qsColumns
+    _                           -> Nothing
+
  payloadColumns =
-    case (contentType, action) of
-      (_, ActionInvoke InvGet)  -> S.fromList $ fst <$> rpcQParams
-      (_, ActionInvoke InvHead) -> S.fromList $ fst <$> rpcQParams
-      (CTUrlEncoded, _)         -> S.fromList $ map (T.decodeUtf8 . fst) $ parseSimpleQuery $ LBS.toStrict reqBody
-      _ -> case (relevantPayload, fromRight Nothing parsedColumns) of
+    case (contentMediaType, action) of
+      (_, ActionInvoke InvGet)  -> S.fromList $ fst <$> qsParams
+      (_, ActionInvoke InvHead) -> S.fromList $ fst <$> qsParams
+      (MTUrlEncoded, _)         -> S.fromList $ map (T.decodeUtf8 . fst) $ parseSimpleQuery $ LBS.toStrict reqBody
+      _ -> case (relevantPayload, columns) of
        (Just ProcessedJSON{payKeys}, _) -> payKeys
        (Just RawJSON{}, Just cls)       -> cls
        _                                -> S.empty
  payload :: Either ByteString Payload
-  payload = case contentType of
-    CTApplicationJSON ->
+  payload = case (contentMediaType, pathIsProc) of
+    (MTApplicationJSON, _) ->
      if isJust columns
        then Right $ RawJSON reqBody
        else note "All object keys must match" . payloadAttributes reqBody
-               =<< if LBS.null reqBody && isTargetingProc
+               =<< if LBS.null reqBody && pathIsProc
                     then Right emptyObject
                     else first BS.pack $ JSON.eitherDecode reqBody
-    CTTextCSV -> do
+    (MTTextCSV, _) -> do
      json <- csvToJson <$> first BS.pack (CSV.decodeByName reqBody)
      note "All lines must have same number of fields" $ payloadAttributes (JSON.encode json) json
-    CTUrlEncoded ->
-      let paramsMap = M.fromList $ (T.decodeUtf8 *** JSON.String . T.decodeUtf8) <$> parseSimpleQuery (LBS.toStrict reqBody) in
-      Right $ ProcessedJSON (JSON.encode paramsMap) $ S.fromList (M.keys paramsMap)
-    ct ->
-      if isTargetingProc && ct `elem` [CTTextPlain, CTOctetStream]
-        then Right $ RawPay reqBody
-        else Left $ "Content-Type not acceptable: " <> ContentType.toMime ct
-  topLevelRange = fromMaybe allRange $ M.lookup "limit" ranges -- if no limit is specified, get all the request rows
-  action =
-    case method of
-      -- The HEAD method is identical to GET except that the server MUST NOT return a message-body in the response
-      -- From https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.4
-      "HEAD"     | isTargetingDefaultSpec -> ActionInspect{isHead=True}
-                 | isTargetingProc        -> ActionInvoke InvHead
-                 | otherwise              -> ActionRead{isHead=True}
-      "GET"      | isTargetingDefaultSpec -> ActionInspect{isHead=False}
-                 | isTargetingProc        -> ActionInvoke InvGet
-                 | otherwise              -> ActionRead{isHead=False}
-      "POST"    -> if isTargetingProc
-                    then ActionInvoke InvPost
-                    else ActionCreate
-      "PATCH"   -> ActionUpdate
-      "PUT"     -> ActionSingleUpsert
-      "DELETE"  -> ActionDelete
-      "OPTIONS" -> ActionInfo
-      _         -> ActionInspect{isHead=False}
+    (MTUrlEncoded, _) ->
+      let paramsMap = HM.fromList $ (T.decodeUtf8 *** JSON.String . T.decodeUtf8) <$> parseSimpleQuery (LBS.toStrict reqBody) in
+      Right $ ProcessedJSON (JSON.encode paramsMap) $ S.fromList (HM.keys paramsMap)
+    (MTTextPlain, True) -> Right $ RawPay reqBody
+    (MTTextXML, True) -> Right $ RawPay reqBody
+    (MTOctetStream, True) -> Right $ RawPay reqBody
+    (ct, _) -> Left $ "Content-Type not acceptable: " <> MediaType.toMime ct
+  topLevelRange = fromMaybe allRange $ HM.lookup "limit" ranges -- if no limit is specified, get all the request rows

  defaultSchema = NonEmptyList.head configDbSchemas
  profile
    | length configDbSchemas <= 1 -- only enable content negotiation by profile when there are multiple schemas specified in the config
      = Nothing
-    | otherwise = case action of
+    | otherwise = case method of
        -- POST/PATCH/PUT/DELETE don't use the same header as per the spec
-        ActionCreate         -> contentProfile
-        ActionUpdate         -> contentProfile
-        ActionSingleUpsert   -> contentProfile
-        ActionDelete         -> contentProfile
-        ActionInvoke InvPost -> contentProfile
-        _                    -> acceptProfile
+        "DELETE" -> contentProfile
+        "PATCH"  -> contentProfile
+        "POST"   -> contentProfile
+        "PUT"    -> contentProfile
+        _        -> acceptProfile
    where
      contentProfile = Just $ maybe defaultSchema T.decodeUtf8 $ lookupHeader "Content-Profile"
      acceptProfile = Just $ maybe defaultSchema T.decodeUtf8 $ lookupHeader "Accept-Profile"
+
  schema = fromMaybe defaultSchema profile
-  target =
-    let
+
+  target
+    | pathIsProc    = (`TargetProc` pathIsRootSpec) <$> callFindProc schema pathName
+    | pathIsDefSpec = Right $ TargetDefaultSpec schema
+    | otherwise     = Right $ TargetIdent $ QualifiedIdentifier schema pathName
+    where
      callFindProc procSch procNam = findProc
        (QualifiedIdentifier procSch procNam) payloadColumns (preferParameters == Just SingleObject) (dbProcs dbStructure)
-        contentType (action == ActionInvoke InvPost)
-    in
-    case path of
-      PathInfo{pSchema, pName, pHasRpc, pIsRootSpec, pIsDefaultSpec}
-        | pHasRpc || pIsRootSpec -> (`TargetProc` pIsRootSpec) <$> callFindProc pSchema pName
-        | pIsDefaultSpec         -> Right $ TargetDefaultSpec pSchema
-        | otherwise              -> Right $ TargetIdent $ QualifiedIdentifier pSchema pName
-      PathUnknown -> Right TargetUnknown
+        contentMediaType (action == ActionInvoke InvPost)

-  shouldParsePayload = case (contentType, action) of
-    (CTUrlEncoded, ActionInvoke InvPost) -> False
-    (_, act)                             -> act `elem` [ActionCreate, ActionUpdate, ActionSingleUpsert, ActionInvoke InvPost]
-  relevantPayload = case (contentType, action) of
+  shouldParsePayload = case (action, contentMediaType) of
+    (ActionMutate MutationCreate, _)       -> True
+    (ActionInvoke InvPost, MTUrlEncoded)   -> False
+    (ActionInvoke InvPost, _)              -> True
+    (ActionMutate MutationSingleUpsert, _) -> True
+    (ActionMutate MutationUpdate, _)       -> True
+    _                                      -> False
+  relevantPayload = case (contentMediaType, action) of
    -- Though ActionInvoke GET/HEAD doesn't really have a payload, we use the payload variable as a way
    -- to store the query string arguments to the function.
-    (_, ActionInvoke InvGet)             -> targetToJsonRpcParams (rightToMaybe target) rpcQParams
-    (_, ActionInvoke InvHead)            -> targetToJsonRpcParams (rightToMaybe target) rpcQParams
-    (CTUrlEncoded, ActionInvoke InvPost) -> targetToJsonRpcParams (rightToMaybe target) $ (T.decodeUtf8 *** T.decodeUtf8) <$> parseSimpleQuery (LBS.toStrict reqBody)
+    (_, ActionInvoke InvGet)             -> targetToJsonRpcParams (rightToMaybe target) qsParams
+    (_, ActionInvoke InvHead)            -> targetToJsonRpcParams (rightToMaybe target) qsParams
+    (MTUrlEncoded, ActionInvoke InvPost) -> targetToJsonRpcParams (rightToMaybe target) $ (T.decodeUtf8 *** T.decodeUtf8) <$> parseSimpleQuery (LBS.toStrict reqBody)
    _ | shouldParsePayload               -> rightToMaybe payload
      | otherwise                        -> Nothing
-  path =
-    case pathInfo req of
-      []             -> case configDbRootSpec of
-                          Just (QualifiedIdentifier pSch pName)     -> PathInfo (if pSch == mempty then schema else pSch) pName False False True
-                          Nothing | configOpenApiMode == OADisabled -> PathUnknown
-                                  | otherwise                       -> PathInfo schema "" False True False
-      [table]        -> PathInfo schema table False False False
-      ["rpc", pName] -> PathInfo schema pName True False False
-      _              -> PathUnknown
  method          = requestMethod req
  hdrs            = requestHeaders req
-  qParams         = [(T.decodeUtf8 k, T.decodeUtf8 <$> v)|(k,v) <- qString]
  lookupHeader    = flip lookup hdrs
  Preferences.Preferences{..} = Preferences.fromHeaders hdrs
-  auth = fromMaybe "" $ lookupHeader hAuthorization
-  tokenStr = case T.split (== ' ') (T.decodeUtf8 auth) of
-    ("Bearer" : t : _) -> t
-    ("bearer" : t : _) -> t
-    _                  -> ""
-  endingIn:: [Text] -> Text -> Bool
-  endingIn xx key = lastWord `elem` xx
-    where lastWord = last $ T.split (=='.') key
-
  headerRange = rangeRequested hdrs
-  replaceLast x s = T.intercalate "." $ L.init (T.split (=='.') s) ++ [x]
-  limitParams :: M.HashMap Text NonnegRange
-  limitParams  = M.fromList [(toS (replaceLast "limit" k), restrictRange (readMaybe . toS =<< v) allRange) | (k,v) <- qParams, isJust v, endingIn ["limit"] k]
-  offsetParams :: M.HashMap Text NonnegRange
-  offsetParams = M.fromList [(toS (replaceLast "limit" k), maybe allRange rangeGeq (readMaybe . toS =<< v)) | (k,v) <- qParams, isJust v, endingIn ["offset"] k]
+  limitRange = fromMaybe allRange (HM.lookup "limit" qsRanges)
+  headerAndLimitRange = rangeIntersection headerRange limitRange

-  urlRange = M.unionWith f limitParams offsetParams
-    where
-      f rl ro = Range (BoundaryBelow o) (BoundaryAbove $ o + l - 1)
-        where
-          l = fromMaybe 0 $ rangeLimit rl
-          o = rangeOffset ro
-  ranges = M.insert "limit" (rangeIntersection headerRange (fromMaybe allRange (M.lookup "limit" urlRange))) urlRange
+  -- Bypass all the ranges and send only the limit zero range (0 <= x <= -1) if
+  -- limit=0 is present in the query params (not allowed for the Range header)
+  ranges = HM.insert "limit" (if hasLimitZero limitRange then limitZeroRange else headerAndLimitRange) qsRanges
+  -- The only emptyRange allowed is the limit zero range
+  isInvalidRange = topLevelRange == emptyRange && not (hasLimitZero limitRange)

 {-|
-  Find the best match from a list of content types accepted by the
+  Find the best match from a list of media types accepted by the
  client in order of decreasing preference and a list of types
  producible by the server.  If there is no match but the client
  accepts */* then return the top server pick.
 -}
-mutuallyAgreeable :: [ContentType] -> [ContentType] -> Maybe ContentType
+mutuallyAgreeable :: [MediaType] -> [MediaType] -> Maybe MediaType
 mutuallyAgreeable sProduces cAccepts =
  let exact = listToMaybe $ L.intersect cAccepts sProduces in
-  if isNothing exact && CTAny `elem` cAccepts
+  if isNothing exact && MTAny `elem` cAccepts
     then listToMaybe sProduces
     else exact

-type CsvData = V.Vector (M.HashMap Text LBS.ByteString)
+type CsvData = V.Vector (M.Map Text LBS.ByteString)

 {-|
  Converts CSV like
@@ -407,7 +375,7 @@ csvToJson :: (CSV.Header, CsvData) -> JSON.Value
 csvToJson (_, vals) =
  JSON.Array $ V.map rowToJsonObj vals
 where
-  rowToJsonObj = JSON.Object .
+  rowToJsonObj = JSON.Object . KM.fromMapText .
    M.map (\str ->
        if str == "NULL"
          then JSON.Null
@@ -421,9 +389,9 @@ payloadAttributes raw json =
    JSON.Array arr ->
      case arr V.!? 0 of
        Just (JSON.Object o) ->
-          let canonicalKeys = S.fromList $ M.keys o
+          let canonicalKeys = S.fromList $ K.toText <$> KM.keys o
              areKeysUniform = all (\case
-                JSON.Object x -> S.fromList (M.keys x) == canonicalKeys
+                JSON.Object x -> S.fromList (K.toText <$> KM.keys x) == canonicalKeys
                _ -> False) arr in
          if areKeysUniform
            then Just $ ProcessedJSON raw canonicalKeys
@@ -431,49 +399,47 @@ payloadAttributes raw json =
        Just _ -> Nothing
        Nothing -> Just emptyPJArray

-    JSON.Object o -> Just $ ProcessedJSON raw (S.fromList $ M.keys o)
+    JSON.Object o -> Just $ ProcessedJSON raw (S.fromList $ K.toText <$> KM.keys o)

    -- truncate everything else to an empty array.
    _ -> Just emptyPJArray
  where
    emptyPJArray = ProcessedJSON (JSON.encode emptyArray) S.empty

-findAcceptContentType :: AppConfig -> Action -> Path -> [ContentType] -> Either ApiRequestError ContentType
-findAcceptContentType conf action path accepts =
-  case mutuallyAgreeable (requestContentTypes conf action path) accepts of
+findAcceptMediaType :: AppConfig -> Action -> PathInfo -> [MediaType] -> Either ApiRequestError MediaType
+findAcceptMediaType conf action path accepts =
+  case mutuallyAgreeable (requestMediaTypes conf action path) accepts of
    Just ct ->
      Right ct
    Nothing ->
-      Left . ContentTypeError $ map ContentType.toMime accepts
+      Left . MediaTypeError $ map MediaType.toMime accepts

-requestContentTypes :: AppConfig -> Action -> Path -> [ContentType]
-requestContentTypes conf action path =
+requestMediaTypes :: AppConfig -> Action -> PathInfo -> [MediaType]
+requestMediaTypes conf action path =
  case action of
-    ActionRead _    -> defaultContentTypes ++ rawContentTypes conf
-    ActionInvoke _  -> invokeContentTypes
-    ActionInspect _ -> [CTOpenAPI, CTApplicationJSON]
-    ActionInfo      -> [CTTextCSV]
-    _               -> defaultContentTypes
+    ActionRead _    -> defaultMediaTypes ++ rawMediaTypes
+    ActionInvoke _  -> invokeMediaTypes
+    ActionInspect _ -> [MTOpenAPI, MTApplicationJSON]
+    ActionInfo      -> [MTTextCSV]
+    _               -> defaultMediaTypes
  where
-    invokeContentTypes =
-      defaultContentTypes
-        ++ rawContentTypes conf
-        ++ [CTOpenAPI | pIsRootSpec path]
-    defaultContentTypes =
-      [CTApplicationJSON, CTSingularJSON, CTTextCSV]
-
-rawContentTypes :: AppConfig -> [ContentType]
-rawContentTypes AppConfig{..} =
-  (ContentType.decodeContentType <$> configRawMediaTypes) `union` [CTOctetStream, CTTextPlain]
+    invokeMediaTypes =
+      defaultMediaTypes
+        ++ rawMediaTypes
+        ++ [MTOpenAPI | pathIsRootSpec path]
+    defaultMediaTypes =
+      [MTApplicationJSON, MTSingularJSON, MTGeoJSON, MTTextCSV] ++
+      [MTPlan $ MTPlanAttrs Nothing PlanJSON mempty | configDbPlanEnabled conf]
+    rawMediaTypes = configRawMediaTypes conf `union` [MTOctetStream, MTTextPlain, MTTextXML]

 {-|
  Search a pg proc by matching name and arguments keys to parameters. Since a function can be overloaded,
  the name is not enough to find it. An overloaded function can have a different volatility or even a different return type.
 -}
-findProc :: QualifiedIdentifier -> S.Set Text -> Bool -> ProcsMap -> ContentType -> Bool -> Either ApiRequestError ProcDescription
-findProc qi argumentsKeys paramsAsSingleObject allProcs contentType isInvPost =
+findProc :: QualifiedIdentifier -> S.Set Text -> Bool -> ProcsMap -> MediaType -> Bool -> Either ApiRequestError ProcDescription
+findProc qi argumentsKeys paramsAsSingleObject allProcs contentMediaType isInvPost =
  case matchProc of
-    ([], [])     -> Left $ NoRpc (qiSchema qi) (qiName qi) (S.toList argumentsKeys) paramsAsSingleObject contentType isInvPost
+    ([], [])     -> Left $ NoRpc (qiSchema qi) (qiName qi) (S.toList argumentsKeys) paramsAsSingleObject contentMediaType isInvPost
    -- If there are no functions with named arguments, fallback to the single unnamed argument function
    ([], [proc]) -> Right proc
    ([], procs)  -> Left $ AmbiguousRpc (toList procs)
@@ -481,31 +447,35 @@ findProc qi argumentsKeys paramsAsSingleObject allProcs contentType isInvPost =
    ([proc], _)  -> Right proc
    (procs, _)   -> Left $ AmbiguousRpc (toList procs)
  where
-    matchProc = overloadedProcPartition $ M.lookupDefault mempty qi allProcs -- first find the proc by name
+    matchProc = overloadedProcPartition $ HM.lookupDefault mempty qi allProcs -- first find the proc by name
    -- The partition obtained has the form (overloadedProcs,fallbackProcs)
    -- where fallbackProcs are functions with a single unnamed parameter
-    overloadedProcPartition procs = foldr select ([],[]) procs
+    overloadedProcPartition = foldr select ([],[])
    select proc ~(ts,fs)
      | matchesParams proc         = (proc:ts,fs)
      | hasSingleUnnamedParam proc = (ts,proc:fs)
      | otherwise                  = (ts,fs)
    -- If the function is called with post and has a single unnamed parameter
    -- it can be called depending on content type and the parameter type
-    hasSingleUnnamedParam proc = isInvPost && case pdParams proc of
-      [ProcParam "" ppType _ _]
-        | contentType == CTApplicationJSON -> ppType `elem` ["json", "jsonb"]
-        | contentType == CTTextPlain       -> ppType == "text"
-        | contentType == CTOctetStream     -> ppType == "bytea"
-        | otherwise                        -> False
-      _ -> False
+    hasSingleUnnamedParam ProcDescription{pdParams=[ProcParam{ppType}]} = isInvPost && case (contentMediaType, ppType) of
+      (MTApplicationJSON, "json")  -> True
+      (MTApplicationJSON, "jsonb") -> True
+      (MTTextPlain, "text")        -> True
+      (MTTextXML, "xml")           -> True
+      (MTOctetStream, "bytea")     -> True
+      _                            -> False
+    hasSingleUnnamedParam _ = False
    matchesParams proc =
-      let params = pdParams proc in
+      let
+        params = pdParams proc
+        firstType = (ppType <$> headMay params)
+      in
      -- exceptional case for Prefer: params=single-object
      if paramsAsSingleObject
-        then length params == 1 && (ppType <$> headMay params) `elem` [Just "json", Just "jsonb"]
+        then length params == 1 && (firstType == Just "json" || firstType == Just "jsonb")
      -- If the function has no parameters, the arguments keys must be empty as well
      else if null params
-        then null argumentsKeys && contentType `notElem` [CTTextPlain, CTOctetStream]
+        then null argumentsKeys && not (isInvPost && contentMediaType `elem` [MTOctetStream, MTTextPlain, MTTextXML])
      -- A function has optional and required parameters. Optional parameters have a default value and
      -- don't require arguments for the function to be executed, required parameters must have an argument present.
      else case L.partition ppReq params of
@@ -21,13 +21,11 @@ module PostgREST.Request.DbRequestBuilder
  , callRequest
  ) where

-import qualified Data.HashMap.Strict as M
+import qualified Data.HashMap.Strict as HM
 import qualified Data.Set            as S

-import Control.Arrow           ((***))
 import Data.Either.Combinators (mapLeft)
 import Data.List               (delete)
-import Data.Text               (isInfixOf)
 import Data.Tree               (Tree (..))

 import PostgREST.DbStructure.Identifiers  (FieldName,
@@ -38,69 +36,58 @@ import PostgREST.DbStructure.Proc         (ProcDescription (..),
                                           procReturnsScalar)
 import PostgREST.DbStructure.Relationship (Cardinality (..),
                                           Junction (..),
-                                           Relationship (..))
-import PostgREST.DbStructure.Table        (Column (..), Table (..),
-                                           tableQi)
-import PostgREST.Error                    (ApiRequestError (..),
-                                           Error (..))
+                                           Relationship (..),
+                                           RelationshipsMap)
+import PostgREST.Error                    (Error (..))
 import PostgREST.Query.SqlFragment        (sourceCTEName)
 import PostgREST.RangeQuery               (NonnegRange, allRange,
                                           restrictRange)
 import PostgREST.Request.ApiRequest       (Action (..),
                                           ApiRequest (..),
+                                           InvokeMethod (..),
+                                           Mutation (..),
                                           Payload (..))

-import PostgREST.Request.Parsers
+import PostgREST.Request.MutateQuery
 import PostgREST.Request.Preferences
+import PostgREST.Request.ReadQuery   as ReadQuery
 import PostgREST.Request.Types

-import qualified PostgREST.DbStructure.Relationship as Relationship
+import qualified PostgREST.Request.QueryParams as QueryParams

 import Protolude hiding (from)

 -- | Builds the ReadRequest tree on a number of stages.
 -- | Adds filters, order, limits on its respective nodes.
 -- | Adds joins conditions obtained from resource embedding.
-readRequest :: Schema -> TableName -> Maybe Integer -> [Relationship] -> ApiRequest -> Either Error ReadRequest
+readRequest :: Schema -> TableName -> Maybe Integer -> RelationshipsMap -> ApiRequest -> Either Error ReadRequest
 readRequest schema rootTableName maxRows allRels apiRequest  =
  mapLeft ApiRequestError $
-  treeRestrictRange maxRows =<<
-  augmentRequestWithJoin schema rootRels =<<
-  (addFiltersOrdersRanges apiRequest . initReadRequest rootName =<< pRequestSelect sel)
+  treeRestrictRange maxRows (iAction apiRequest) =<<
+  augmentRequestWithJoin schema allRels =<<
+  addLogicTrees apiRequest =<<
+  addRanges apiRequest =<<
+  addOrders apiRequest =<<
+  addFilters apiRequest (initReadRequest rootName rootAlias qsSelect)
  where
-    sel = fromMaybe "*" $ iSelect apiRequest -- default to all columns requested (SELECT *) for a non existent ?select querystring param
-    (rootName, rootRels) = rootWithRels schema rootTableName allRels (iAction apiRequest)
-
-- Get the root table name with its relationships according to the Action type.
-- This is done because of the shape of the final SQL Query. The mutation cases
-- are wrapped in a WITH {sourceCTEName}(see Statements.hs).  So we need a FROM
-- {sourceCTEName} instead of FROM {tableName}.
-rootWithRels :: Schema -> TableName -> [Relationship] -> Action -> (QualifiedIdentifier, [Relationship])
-rootWithRels schema rootTableName allRels action = case action of
-  ActionRead _ -> (QualifiedIdentifier schema rootTableName, allRels) -- normal read case
-  _            -> (QualifiedIdentifier mempty _sourceCTEName, mapMaybe toSourceRel allRels ++ allRels) -- mutation cases and calling proc
-  where
-    _sourceCTEName = decodeUtf8 sourceCTEName
-    -- To enable embedding in the sourceCTEName cases we need to replace the
-    -- foreign key tableName in the Relationship with {sourceCTEName}. This way
-    -- findRel can find relationships with sourceCTEName.
-    toSourceRel :: Relationship -> Maybe Relationship
-    toSourceRel r@Relationship{relTable=t}
-      | rootTableName == tableName t = Just $ r {relTable=t {tableName=_sourceCTEName}}
-      | otherwise                    = Nothing
+    QueryParams.QueryParams{..} = iQueryParams apiRequest
+    (rootName, rootAlias) = case iAction apiRequest of
+      ActionRead _ -> (QualifiedIdentifier schema rootTableName, Nothing)
+      -- the CTE we use for non-read cases has a sourceCTEName(see Statements.hs) as the WITH name so we use the table name as an alias so findRel can find the right relationship
+      _ -> (QualifiedIdentifier mempty $ decodeUtf8 sourceCTEName, Just rootTableName)

 -- Build the initial tree with a Depth attribute so when a self join occurs we
 -- can differentiate the parent and child tables by having an alias like
 -- "table_depth", this is related to
 -- http://github.com/PostgREST/postgrest/issues/987.
-initReadRequest :: QualifiedIdentifier -> [Tree SelectItem] -> ReadRequest
-initReadRequest rootQi =
+initReadRequest :: QualifiedIdentifier -> Maybe Alias -> [Tree SelectItem] -> ReadRequest
+initReadRequest rootQi rootAlias =
  foldr (treeEntry rootDepth) initial
  where
    rootDepth = 0
    rootSchema = qiSchema rootQi
    rootName = qiName rootQi
-    initial = Node (Select [] rootQi Nothing [] [] [] [] allRange, (rootName, Nothing, Nothing, Nothing, Nothing, rootDepth)) []
+    initial = Node (Select [] rootQi rootAlias [] [] [] allRange, (rootName, Nothing, Nothing, Nothing, Nothing, rootDepth)) []
    treeEntry :: Depth -> Tree SelectItem -> ReadRequest -> ReadRequest
    treeEntry depth (Node fld@((fn, _),_,alias, hint, joinType) fldForest) (Node (q, i) rForest) =
      let nxtDepth = succ depth in
@@ -108,29 +95,36 @@ initReadRequest rootQi =
        [] -> Node (q {select=fld:select q}, i) rForest
        _  -> Node (q, i) $
              foldr (treeEntry nxtDepth)
-              (Node (Select [] (QualifiedIdentifier rootSchema fn) Nothing [] [] [] [] allRange,
+              (Node (Select [] (QualifiedIdentifier rootSchema fn) Nothing [] [] [] allRange,
                (fn, Nothing, alias, hint, joinType, nxtDepth)) [])
              fldForest:rForest

 -- | Enforces the `max-rows` config on the result
-treeRestrictRange :: Maybe Integer -> ReadRequest -> Either ApiRequestError ReadRequest
-treeRestrictRange maxRows request = pure $ nodeRestrictRange maxRows <$> request
+treeRestrictRange :: Maybe Integer -> Action -> ReadRequest -> Either ApiRequestError ReadRequest
+treeRestrictRange _ (ActionMutate _) request = Right request
+treeRestrictRange maxRows _ request = pure $ nodeRestrictRange maxRows <$> request
  where
    nodeRestrictRange :: Maybe Integer -> ReadNode -> ReadNode
    nodeRestrictRange m (q@Select {range_=r}, i) = (q{range_=restrictRange m r }, i)

-augmentRequestWithJoin :: Schema -> [Relationship] -> ReadRequest -> Either ApiRequestError ReadRequest
+augmentRequestWithJoin :: Schema -> RelationshipsMap -> ReadRequest -> Either ApiRequestError ReadRequest
 augmentRequestWithJoin schema allRels request =
-  addRels schema allRels Nothing request
-  >>= addJoinConditions Nothing
+ addJoinConditions Nothing <$> addRels schema allRels Nothing request

-addRels :: Schema -> [Relationship] -> Maybe ReadRequest -> ReadRequest -> Either ApiRequestError ReadRequest
+addRels :: Schema -> RelationshipsMap -> Maybe ReadRequest -> ReadRequest -> Either ApiRequestError ReadRequest
 addRels schema allRels parentNode (Node (query@Select{from=tbl}, (nodeName, _, alias, hint, joinType, depth)) forest) =
  case parentNode of
-    Just (Node (Select{from=parentNodeQi}, _) _) ->
-      let newFrom r = if qiName tbl == nodeName then tableQi (relForeignTable r) else tbl
-          newReadNode = (\r -> (query{from=newFrom r}, (nodeName, Just r, alias, hint, joinType, depth))) <$> rel
-          rel = findRel schema allRels (qiName parentNodeQi) nodeName hint
+    Just (Node (Select{from=parentNodeQi, fromAlias=aliasQi}, _) _) ->
+      let newFrom r = if qiName tbl == nodeName then relForeignTable r else tbl
+          newReadNode = (\r ->
+            if not $ relIsSelf r -- add alias if self rel TODO consolidate aliasing in another function
+              then (query{from=newFrom r}, (nodeName, Just r, alias, hint, joinType, depth))
+              else (query{from=newFrom r, fromAlias=Just (qiName (newFrom r) <> "_" <> show depth)}, (nodeName, Just r, alias, hint, joinType, depth))
+            ) <$> rel
+          origin = if depth == 1 -- Only on depth 1 we check if the root(depth 0) has an alias so the sourceCTEName alias can be found as a relationship
+            then fromMaybe (qiName parentNodeQi) aliasQi
+            else qiName parentNodeQi
+          rel = findRel schema allRels origin nodeName hint
      in
      Node <$> newReadNode <*> (updateForest . hush $ Node <$> newReadNode <*> pure forest)
    _ ->
@@ -140,211 +134,205 @@ addRels schema allRels parentNode (Node (query@Select{from=tbl}, (nodeName, _, a
    updateForest :: Maybe ReadRequest -> Either ApiRequestError [ReadRequest]
    updateForest rq = addRels schema allRels rq `traverse` forest

+-- applies aliasing to join conditions TODO refactor, this should go into the querybuilder module
+addJoinConditions :: Maybe Alias -> ReadRequest -> ReadRequest
+addJoinConditions _ (Node node@(Select{fromAlias=tblAlias}, (_, Nothing, _, _, _, _)) forest) = Node node (addJoinConditions tblAlias <$> forest)
+addJoinConditions _ (Node node@(Select{fromAlias=tblAlias}, (_, Just ComputedRelationship{}, _, _, _, _)) forest) = Node node (addJoinConditions tblAlias <$> forest)
+addJoinConditions previousAlias (Node (query@Select{fromAlias=tblAlias}, nodeProps@(_, Just (Relationship QualifiedIdentifier{qiSchema=tSchema, qiName=tN} QualifiedIdentifier{qiName=ftN} _ card _ _), _, _, _, _)) forest) =
+  Node (query{joinConditions=joinConds}, nodeProps) (addJoinConditions tblAlias <$> forest)
+  where
+    joinConds =
+      case card of
+        M2M (Junction QualifiedIdentifier{qiName=jtn} _ _ jcols1 jcols2) ->
+           (toJoinCondition Nothing Nothing ftN jtn <$> jcols2) ++ (toJoinCondition previousAlias tblAlias tN jtn <$> jcols1)
+        O2M _ cols ->
+          toJoinCondition previousAlias tblAlias tN ftN <$> cols
+        M2O _ cols ->
+          toJoinCondition previousAlias tblAlias tN ftN <$> cols
+        O2O _ cols ->
+          toJoinCondition previousAlias tblAlias tN ftN <$> cols
+    toJoinCondition :: Maybe Alias -> Maybe Alias -> Text -> Text -> (FieldName, FieldName) -> JoinCondition
+    toJoinCondition prAl newAl tb ftb (c, fc) =
+      let qi1 = QualifiedIdentifier tSchema ftb
+          qi2 = QualifiedIdentifier tSchema tb in
+        JoinCondition (maybe qi1 (QualifiedIdentifier mempty) newAl, fc)
+                      (maybe qi2 (QualifiedIdentifier mempty) prAl, c)
+
 -- Finds a relationship between an origin and a target in the request:
 -- /origin?select=target(*) If more than one relationship is found then the
 -- request is ambiguous and we return an error.  In that case the request can
 -- be disambiguated by adding precision to the target or by using a hint:
-- /origin?select=target!hint(*) The elements will be matched according to
-- these rules:
-- origin = table / view
-- target = table / view / constraint / column-from-origin
-- hint   = table / view / constraint / column-from-origin / column-from-target
-- (hint can take table / view values to aid in finding the junction in an m2m relationship)
-findRel :: Schema -> [Relationship] -> NodeName -> NodeName -> Maybe Hint -> Either ApiRequestError Relationship
+-- /origin?select=target!hint(*). The origin can be a table or view.
+findRel :: Schema -> RelationshipsMap -> NodeName -> NodeName -> Maybe Hint -> Either ApiRequestError Relationship
 findRel schema allRels origin target hint =
-  case rel of
-    []  -> Left $ NoRelBetween origin target
+  case rels of
+    []  -> Left $ NoRelBetween origin target schema
    [r] -> Right r
-    -- Here we handle a self reference relationship to not cause a breaking
-    -- change: In a self reference we get two relationships with the same
-    -- foreign key and relTable/relFtable but with different
-    -- cardinalities(m2o/o2m) We output the O2M rel, the M2O rel can be
-    -- obtained by using the origin column as an embed hint.
-    rs@[rel0, rel1]  -> case (relCardinality rel0, relCardinality rel1, relTable rel0 == relTable rel1 && relForeignTable rel0 == relForeignTable rel1) of
-      (O2M cons1, M2O cons2, True) -> if cons1 == cons2 then Right rel0 else Left $ AmbiguousRelBetween origin target rs
-      (M2O cons1, O2M cons2, True) -> if cons1 == cons2 then Right rel1 else Left $ AmbiguousRelBetween origin target rs
-      _                            -> Left $ AmbiguousRelBetween origin target rs
-    rs -> Left $ AmbiguousRelBetween origin target rs
+    rs  -> Left $ AmbiguousRelBetween origin target rs
  where
-    matchFKSingleCol hint_ cols = length cols == 1 && hint_ == (colName <$> head cols)
+    matchFKSingleCol hint_ card = case card of
+      O2M _ [(col, _)] -> hint_ == col
+      M2O _ [(col, _)] -> hint_ == col
+      O2O _ [(col, _)] -> hint_ == col
+      _                -> False
+    matchFKRefSingleCol hint_ card  = case card of
+      O2M _ [(_, fCol)] -> hint_ == fCol
+      M2O _ [(_, fCol)] -> hint_ == fCol
+      O2O _ [(_, fCol)] -> hint_ == fCol
+      _                 -> False
    matchConstraint tar card = case card of
-      O2M cons -> tar == Just cons
-      M2O cons -> tar == Just cons
-      _        -> False
+      O2M cons _ -> tar == cons
+      M2O cons _ -> tar == cons
+      O2O cons _ -> tar == cons
+      _          -> False
    matchJunction hint_ card = case card of
-      M2M Junction{junTable} -> hint_ == Just (tableName junTable)
+      M2M Junction{junTable} -> hint_ == qiName junTable
      _                      -> False
-    rel = filter (
-      \Relationship{..} ->
-        -- Both relationship ends need to be on the exposed schema
-        schema == tableSchema relTable && schema == tableSchema relForeignTable &&
-        (
-          -- /projects?select=clients(*)
-          origin == tableName relTable  &&  -- projects
-          target == tableName relForeignTable ||  -- clients
+    isM2O card = case card of
+      M2O _ _ -> True
+      _       -> False
+    isO2M card = case card of
+      O2M _ _ -> True
+      _       -> False
+    rels = filter (\case
+      ComputedRelationship{relFunction} -> target == qiName relFunction
+      Relationship{..} ->
+        -- In a self-relationship we have a single foreign key but two relationships with different cardinalities: M2O/O2M. For disambiguation, we use the convention of getting:
+        -- TODO: handle one-to-one and many-to-many self-relationships
+        if relIsSelf
+        then case hint of
+          Nothing ->
+            -- The O2M by using the table name in the target
+            target == qiName relForeignTable && isO2M relCardinality -- /family_tree?select=children:family_tree(*)
+            ||
+            -- The M2O by using the column name in the target
+            matchFKSingleCol target relCardinality && isM2O relCardinality -- /family_tree?select=parent(*)
+          Just hnt ->
+            -- /organizations?select=auditees:organizations!auditor(*)
+            target == qiName relForeignTable && isO2M relCardinality
+            && matchFKRefSingleCol hnt relCardinality -- auditor
+        else case hint of
+          -- target = table / view / constraint / column-from-origin (constraint/column-from-origin can only come from tables https://github.com/PostgREST/postgrest/issues/2277)
+          -- hint   = table / view / constraint / column-from-origin / column-from-target (hint can take table / view values to aid in finding the junction in an m2m relationship)
+          Nothing ->
+              -- /projects?select=clients(*)
+              target == qiName relForeignTable -- clients
+              ||
+              -- /projects?select=projects_client_id_fkey(*)
+              matchConstraint target relCardinality -- projects_client_id_fkey
+              && not relFTableIsView
+              ||
+              -- /projects?select=client_id(*)
+              matchFKSingleCol target relCardinality -- client_id
+              && not relFTableIsView
+          Just hnt ->
+            -- /projects?select=clients(*)
+            target == qiName relForeignTable -- clients
+            && (
+              -- /projects?select=clients!projects_client_id_fkey(*)
+              matchConstraint hnt relCardinality || -- projects_client_id_fkey

-          -- /projects?select=projects_client_id_fkey(*)
-          (
-            origin == tableName relTable &&              -- projects
-            matchConstraint (Just target) relCardinality -- projects_client_id_fkey
-          ) ||
-          -- /projects?select=client_id(*)
-          (
-            origin == tableName relTable &&           -- projects
-            matchFKSingleCol (Just target) relColumns -- client_id
-          )
-        ) && (
-          isNothing hint || -- hint is optional
+              -- /projects?select=clients!client_id(*) or /projects?select=clients!id(*)
+              matchFKSingleCol hnt relCardinality      || -- client_id
+              matchFKRefSingleCol hnt relCardinality   || -- id

-          -- /projects?select=clients!projects_client_id_fkey(*)
-          matchConstraint hint relCardinality || -- projects_client_id_fkey
+              -- /users?select=tasks!users_tasks(*) many-to-many between users and tasks
+              matchJunction hnt relCardinality -- users_tasks
+            )
+      ) $ fromMaybe mempty $ HM.lookup (QualifiedIdentifier schema origin, schema) allRels

-          -- /projects?select=clients!client_id(*) or /projects?select=clients!id(*)
-          matchFKSingleCol hint relColumns  || -- client_id
-          matchFKSingleCol hint relForeignColumns || -- id
-
-          -- /users?select=tasks!users_tasks(*) many-to-many between users and tasks
-          matchJunction hint relCardinality -- users_tasks
-        )
-      ) allRels
-
-- previousAlias is only used for the case of self joins
-addJoinConditions :: Maybe Alias -> ReadRequest -> Either ApiRequestError ReadRequest
-addJoinConditions previousAlias (Node node@(query@Select{from=tbl}, nodeProps@(_, rel, _, _, _, depth)) forest) =
-  case rel of
-    Just r@Relationship{relCardinality=M2M Junction{junTable}} ->
-      let rq = augmentQuery r in
-      Node (rq{implicitJoins=tableQi junTable:implicitJoins rq}, nodeProps) <$> updatedForest
-    Just r -> Node (augmentQuery r, nodeProps) <$> updatedForest
-    Nothing -> Node node <$> updatedForest
+addFilters :: ApiRequest -> ReadRequest -> Either ApiRequestError ReadRequest
+addFilters ApiRequest{..} rReq =
+  foldr addFilterToNode (Right rReq) flts
  where
-    newAlias = case Relationship.isSelfReference <$> rel of
-      Just True
-        | depth /= 0 -> Just (qiName tbl <> "_" <> show depth) -- root node doesn't get aliased
-        | otherwise  -> Nothing
-      _              -> Nothing
-    augmentQuery r =
-      foldr
-        (\jc rq@Select{joinConditions=jcs} -> rq{joinConditions=jc:jcs})
-        query{fromAlias=newAlias}
-        (getJoinConditions previousAlias newAlias r)
-    updatedForest = addJoinConditions newAlias `traverse` forest
+    QueryParams.QueryParams{..} = iQueryParams
+    flts =
+      case iAction of
+        ActionInvoke InvGet  -> qsFilters
+        ActionInvoke InvHead -> qsFilters
+        ActionInvoke _       -> qsFilters
+        ActionRead _         -> qsFilters
+        _                    -> qsFiltersNotRoot

-- previousAlias and newAlias are used in the case of self joins
-getJoinConditions :: Maybe Alias -> Maybe Alias -> Relationship -> [JoinCondition]
-getJoinConditions previousAlias newAlias (Relationship Table{tableSchema=tSchema, tableName=tN} cols Table{tableName=ftN} fCols card) =
-  case card of
-    M2M (Junction Table{tableName=jtn} _ jc1 _ jc2) ->
-      zipWith (toJoinCondition tN jtn) cols jc1 ++ zipWith (toJoinCondition ftN jtn) fCols jc2
-    _ ->
-      zipWith (toJoinCondition tN ftN) cols fCols
+    addFilterToNode :: (EmbedPath, Filter) -> Either ApiRequestError ReadRequest ->  Either ApiRequestError ReadRequest
+    addFilterToNode =
+      updateNode (\flt (Node (q@Select {where_=lf}, i) f) -> Node (q{ReadQuery.where_=addFilterToLogicForest flt lf}, i) f)
+
+addOrders :: ApiRequest -> ReadRequest -> Either ApiRequestError ReadRequest
+addOrders ApiRequest{..} rReq =
+  case iAction of
+    ActionMutate _ -> Right rReq
+    _              -> foldr addOrderToNode (Right rReq) qsOrder
  where
-    toJoinCondition :: Text -> Text -> Column -> Column -> JoinCondition
-    toJoinCondition tb ftb c fc =
-      let qi1 = removeSourceCTESchema tSchema tb
-          qi2 = removeSourceCTESchema tSchema ftb in
-        JoinCondition (maybe qi1 (QualifiedIdentifier mempty) previousAlias, colName c)
-                      (maybe qi2 (QualifiedIdentifier mempty) newAlias, colName fc)
+    QueryParams.QueryParams{..} = iQueryParams

-    -- On mutation and calling proc cases we wrap the target table in a WITH
-    -- {sourceCTEName} if this happens remove the schema `FROM
-    -- "schema"."{sourceCTEName}"` and use only the `FROM "{sourceCTEName}"`.
-    -- If the schema remains the FROM would be invalid.
-    removeSourceCTESchema :: Schema -> TableName -> QualifiedIdentifier
-    removeSourceCTESchema schema tbl = QualifiedIdentifier (if tbl == decodeUtf8 sourceCTEName then mempty else schema) tbl
+    addOrderToNode :: (EmbedPath, [OrderTerm]) -> Either ApiRequestError ReadRequest -> Either ApiRequestError ReadRequest
+    addOrderToNode = updateNode (\o (Node (q,i) f) -> Node (q{order=o}, i) f)

-addFiltersOrdersRanges :: ApiRequest -> ReadRequest -> Either ApiRequestError ReadRequest
-addFiltersOrdersRanges apiRequest rReq = do
-  rFlts <- foldr addFilter rReq <$> filters
-  rOrds <- foldr addOrder rFlts <$> orders
-  rRngs <- foldr addRange rOrds <$> ranges
-  foldr addLogicTree rRngs      <$> logicForest
+addRanges :: ApiRequest -> ReadRequest -> Either ApiRequestError ReadRequest
+addRanges ApiRequest{..} rReq =
+  case iAction of
+    ActionMutate _ -> Right rReq
+    _              -> foldr addRangeToNode (Right rReq) =<< ranges
  where
-    filters :: Either ApiRequestError [(EmbedPath, Filter)]
-    filters = pRequestFilter `traverse` flts
-    orders :: Either ApiRequestError [(EmbedPath, [OrderTerm])]
-    orders = pRequestOrder `traverse` iOrder apiRequest
    ranges :: Either ApiRequestError [(EmbedPath, NonnegRange)]
-    ranges = pRequestRange `traverse` M.toList (iRange apiRequest)
-    logicForest :: Either ApiRequestError [(EmbedPath, LogicTree)]
-    logicForest = pRequestLogicTree `traverse` logFrst
-    action = iAction apiRequest
-    -- there can be no filters on the root table when we are doing insert/update/delete
-    (flts, logFrst) =
-      case action of
-        ActionInvoke _ -> (iFilters apiRequest, iLogic apiRequest)
-        ActionRead _   -> (iFilters apiRequest, iLogic apiRequest)
-        _              -> join (***) (filter (( "." `isInfixOf` ) . fst)) (iFilters apiRequest, iLogic apiRequest)
+    ranges = first QueryParamError $ QueryParams.pRequestRange `traverse` HM.toList iRange

-addFilterToNode :: Filter -> ReadRequest -> ReadRequest
-addFilterToNode flt (Node (q@Select {where_=lf}, i) f) = Node (q{where_=addFilterToLogicForest flt lf}::ReadQuery, i) f
+    addRangeToNode :: (EmbedPath, NonnegRange) -> Either ApiRequestError ReadRequest -> Either ApiRequestError ReadRequest
+    addRangeToNode = updateNode (\r (Node (q,i) f) -> Node (q{range_=r}, i) f)

-addFilter :: (EmbedPath, Filter) -> ReadRequest -> ReadRequest
-addFilter = addProperty addFilterToNode
-
-addOrderToNode :: [OrderTerm] -> ReadRequest -> ReadRequest
-addOrderToNode o (Node (q,i) f) = Node (q{order=o}, i) f
-
-addOrder :: (EmbedPath, [OrderTerm]) -> ReadRequest -> ReadRequest
-addOrder = addProperty addOrderToNode
-
-addRangeToNode :: NonnegRange -> ReadRequest -> ReadRequest
-addRangeToNode r (Node (q,i) f) = Node (q{range_=r}, i) f
-
-addRange :: (EmbedPath, NonnegRange) -> ReadRequest -> ReadRequest
-addRange = addProperty addRangeToNode
-
-addLogicTreeToNode :: LogicTree -> ReadRequest -> ReadRequest
-addLogicTreeToNode t (Node (q@Select{where_=lf},i) f) = Node (q{where_=t:lf}::ReadQuery, i) f
-
-addLogicTree :: (EmbedPath, LogicTree) -> ReadRequest -> ReadRequest
-addLogicTree = addProperty addLogicTreeToNode
-
-addProperty :: (a -> ReadRequest -> ReadRequest) -> (EmbedPath, a) -> ReadRequest -> ReadRequest
-addProperty f ([], a) rr = f a rr
-addProperty f (targetNodeName:remainingPath, a) (Node rn forest) =
-  case pathNode of
-    Nothing -> Node rn forest -- the property is silenty dropped in the Request does not contain the required path
-    Just tn -> Node rn (addProperty f (remainingPath, a) tn:delete tn forest)
+addLogicTrees :: ApiRequest -> ReadRequest -> Either ApiRequestError ReadRequest
+addLogicTrees ApiRequest{..} rReq =
+  foldr addLogicTreeToNode (Right rReq) qsLogic
  where
-    pathNode = find (\(Node (_,(nodeName,_,alias,_,_, _)) _) -> nodeName == targetNodeName || alias == Just targetNodeName) forest
+    QueryParams.QueryParams{..} = iQueryParams

-mutateRequest :: Schema -> TableName -> ApiRequest -> [FieldName] -> ReadRequest -> Either Error MutateRequest
-mutateRequest schema tName apiRequest pkCols readReq = mapLeft ApiRequestError $
-  case action of
-    ActionCreate -> do
-        confCols <- case iOnConflict apiRequest of
-            Nothing    -> pure pkCols
-            Just param -> pRequestOnConflict param
-        pure $ Insert qi (iColumns apiRequest) body ((,) <$> iPreferResolution apiRequest <*> Just confCols) [] returnings
-    ActionUpdate -> Update qi (iColumns apiRequest) body  <$> combinedLogic <*> pure returnings
-    ActionSingleUpsert ->
-      (\flts ->
-        if null (iLogic apiRequest) &&
-           S.fromList (fst <$> iFilters apiRequest) == S.fromList pkCols &&
+    addLogicTreeToNode :: (EmbedPath, LogicTree) -> Either ApiRequestError ReadRequest -> Either ApiRequestError ReadRequest
+    addLogicTreeToNode = updateNode (\t (Node (q@Select{where_=lf},i) f) -> Node (q{ReadQuery.where_=t:lf}, i) f)
+
+-- Find a Node of the Tree and apply a function to it
+updateNode :: (a -> ReadRequest -> ReadRequest) -> (EmbedPath, a) -> Either ApiRequestError ReadRequest -> Either ApiRequestError ReadRequest
+updateNode f ([], a) rr = f a <$> rr
+updateNode _ _ (Left e) = Left e
+updateNode f (targetNodeName:remainingPath, a) (Right (Node rootNode forest)) =
+  case findNode of
+    Nothing -> Left $ NotEmbedded targetNodeName
+    Just target ->
+      (\node -> Node rootNode $ node : delete target forest) <$>
+      updateNode f (remainingPath, a) (Right target)
+  where
+    findNode :: Maybe ReadRequest
+    findNode = find (\(Node (_,(nodeName,_,alias,_,_, _)) _) -> nodeName == targetNodeName || alias == Just targetNodeName) forest
+
+mutateRequest :: Mutation -> Schema -> TableName -> ApiRequest -> [FieldName] -> ReadRequest -> Either Error MutateRequest
+mutateRequest mutation schema tName ApiRequest{..} pkCols readReq = mapLeft ApiRequestError $
+  case mutation of
+    MutationCreate ->
+      Right $ Insert qi iColumns body ((,) <$> iPreferResolution <*> Just confCols) [] returnings
+    MutationUpdate -> Right $ Update qi iColumns body combinedLogic iTopLevelRange rootOrder returnings
+    MutationSingleUpsert ->
+        if null qsLogic &&
+           qsFilterFields == S.fromList pkCols &&
           not (null (S.fromList pkCols)) &&
           all (\case
-              Filter _ (OpExpr False (Op "eq" _)) -> True
-              _                                   -> False) flts
-          then Insert qi (iColumns apiRequest) body (Just (MergeDuplicates, pkCols)) <$> combinedLogic <*> pure returnings
+              Filter _ (OpExpr False (Op OpEqual _)) -> True
+              _                                      -> False) qsFiltersRoot
+          then Right $ Insert qi iColumns body (Just (MergeDuplicates, pkCols)) combinedLogic returnings
        else
-          Left InvalidFilters) =<< filters
-    ActionDelete -> Delete qi <$> combinedLogic <*> pure returnings
-    _            -> Left UnsupportedVerb
+          Left InvalidFilters
+    MutationDelete -> Right $ Delete qi combinedLogic iTopLevelRange rootOrder returnings
  where
+    confCols = fromMaybe pkCols qsOnConflict
+    QueryParams.QueryParams{..} = iQueryParams
    qi = QualifiedIdentifier schema tName
-    action = iAction apiRequest
    returnings =
-      if iPreferRepresentation apiRequest == None
+      if iPreferRepresentation == None
        then []
        else returningCols readReq pkCols
-    filters = map snd <$> pRequestFilter `traverse` mutateFilters
-    logic = map snd <$> pRequestLogicTree `traverse` logicFilters
-    combinedLogic = foldr addFilterToLogicForest <$> logic <*> filters
-    -- update/delete filters can be only on the root table
-    (mutateFilters, logicFilters) = join (***) onlyRoot (iFilters apiRequest, iLogic apiRequest)
-    onlyRoot = filter (not . ( "." `isInfixOf` ) . fst)
-    body = payRaw <$> iPayload apiRequest -- the body is assumed to be json at this stage(ApiRequest validates)
+    logic = map snd qsLogic
+    rootOrder = maybe [] snd $ find (\(x, _) -> null x) qsOrder
+    combinedLogic = foldr addFilterToLogicForest logic qsFiltersRoot
+    body = payRaw <$> iPayload -- the body is assumed to be json at this stage(ApiRequest validates)

 callRequest :: ProcDescription -> ApiRequest -> ReadRequest -> CallRequest
 callRequest proc apiReq readReq = FunctionCall {
@@ -362,7 +350,7 @@ callRequest proc apiReq readReq = FunctionCall {
            | ppName prm == mempty -> OnePosParam prm
            | otherwise            -> KeyParams $ specifiedParams [prm]
      prms  -> KeyParams $ specifiedParams prms
-    specifiedParams params = filter (\x -> ppName x `S.member` iColumns apiReq) params
+    specifiedParams = filter (\x -> ppName x `S.member` iColumns apiReq)

 returningCols :: ReadRequest -> [FieldName] -> [FieldName]
 returningCols rr@(Node _ forest) pkCols
@@ -379,9 +367,16 @@ returningCols rr@(Node _ forest) pkCols
    -- projects.  So this adds the foreign key columns to ensure the embedding
    -- succeeds, result would be `RETURNING name, client_id`.
    fkCols = concat $ mapMaybe (\case
-        Node (_, (_, Just Relationship{relColumns=cols}, _, _, _, _)) _ -> Just cols
+        Node (_, (_, Just Relationship{relCardinality=O2M _ cols}, _, _, _, _)) _ -> Just $ fst <$> cols
+        Node (_, (_, Just Relationship{relCardinality=M2O _ cols}, _, _, _, _)) _ -> Just $ fst <$> cols
+        Node (_, (_, Just Relationship{relCardinality=O2O _ cols}, _, _, _, _)) _ -> Just $ fst <$> cols
+        Node (_, (_, Just Relationship{relCardinality=M2M Junction{junColumns1, junColumns2}}, _, _, _, _)) _ -> Just $ (fst <$> junColumns1) ++ (fst <$> junColumns2)
        _                                                        -> Nothing
      ) forest
+    hasComputedRel = isJust $ find (\case
+      Node (_, (_, Just ComputedRelationship{}, _, _, _, _)) _ -> True
+      _ -> False
+      ) forest
    -- However if the "client_id" is present, e.g. mutateRequest to
    -- /projects?select=client_id,name,clients(name) we would get `RETURNING
    -- client_id, name, client_id` and then we would produce the "column
@@ -389,7 +384,10 @@ returningCols rr@(Node _ forest) pkCols
    -- deduplicate with Set: We are adding the primary key columns as well to
    -- make sure, that a proper location header can always be built for
    -- INSERT/POST
-    returnings = S.toList . S.fromList $ fldNames ++ (colName <$> fkCols) ++ pkCols
+    returnings =
+      if not hasComputedRel
+        then S.toList . S.fromList $ fldNames ++ fkCols ++ pkCols
+        else ["*"] -- on computed relationships we cannot know the required columns for an embedding to succeed, so we just return all

 -- Traditional filters(e.g. id=eq.1) are added as root nodes of the LogicTree
 -- they are later concatenated with AND in the QueryBuilder
@@ -0,0 +1,44 @@
+module PostgREST.Request.MutateQuery
+  ( MutateQuery(..)
+  , MutateRequest
+  )
+where
+
+import qualified Data.ByteString.Lazy as LBS
+import qualified Data.Set             as S
+
+import PostgREST.DbStructure.Identifiers (FieldName,
+                                          QualifiedIdentifier)
+import PostgREST.RangeQuery              (NonnegRange)
+import PostgREST.Request.Preferences     (PreferResolution)
+import PostgREST.Request.Types           (LogicTree, OrderTerm)
+
+import Protolude
+
+type MutateRequest = MutateQuery
+
+data MutateQuery
+  = Insert
+      { in_        :: QualifiedIdentifier
+      , insCols    :: S.Set FieldName
+      , insBody    :: Maybe LBS.ByteString
+      , onConflict :: Maybe (PreferResolution, [FieldName])
+      , where_     :: [LogicTree]
+      , returning  :: [FieldName]
+      }
+  | Update
+      { in_       :: QualifiedIdentifier
+      , updCols   :: S.Set FieldName
+      , updBody   :: Maybe LBS.ByteString
+      , where_    :: [LogicTree]
+      , mutRange  :: NonnegRange
+      , mutOrder  :: [OrderTerm]
+      , returning :: [FieldName]
+      }
+  | Delete
+      { in_       :: QualifiedIdentifier
+      , where_    :: [LogicTree]
+      , mutRange  :: NonnegRange
+      , mutOrder  :: [OrderTerm]
+      , returning :: [FieldName]
+      }
@@ -1,294 +0,0 @@
-{-|
-Module      : PostgREST.Request.Parsers
-Description : PostgREST parser combinators
-
-This module is in charge of parsing all the querystring values in an url, e.g. the select, id, order in `/projects?select=id,name&id=eq.1&order=id,name.desc`.
-}
-module PostgREST.Request.Parsers
-  ( pColumns
-  , pLogicPath
-  , pLogicSingleVal
-  , pLogicTree
-  , pOrder
-  , pOrderTerm
-  , pRequestColumns
-  , pRequestFilter
-  , pRequestLogicTree
-  , pRequestOnConflict
-  , pRequestOrder
-  , pRequestRange
-  , pRequestSelect
-  , pSingleVal
-  , pTreePath
-  ) where
-
-import qualified Data.HashMap.Strict as M
-import qualified Data.Set            as S
-
-import Data.Either.Combinators       (mapLeft)
-import Data.Foldable                 (foldl1)
-import Data.List                     (init, last)
-import Data.Text                     (intercalate, replace, strip)
-import Data.Tree                     (Tree (..))
-import Text.Parsec.Error             (errorMessages,
-                                      showErrorMessages)
-import Text.ParserCombinators.Parsec (GenParser, ParseError, Parser,
-                                      anyChar, between, char, digit,
-                                      eof, errorPos, letter,
-                                      lookAhead, many1, noneOf,
-                                      notFollowedBy, oneOf, option,
-                                      optionMaybe, parse, sepBy1,
-                                      string, try, (<?>))
-
-import PostgREST.DbStructure.Identifiers (FieldName)
-import PostgREST.Error                   (ApiRequestError (ParseRequestError))
-import PostgREST.Query.SqlFragment       (ftsOperators, operators)
-import PostgREST.RangeQuery              (NonnegRange)
-
-import PostgREST.Request.Types
-
-import Protolude hiding (intercalate, option, replace, try)
-
-pRequestSelect :: Text -> Either ApiRequestError [Tree SelectItem]
-pRequestSelect selStr =
-  mapError $ parse pFieldForest ("failed to parse select parameter (" <> toS selStr <> ")") (toS selStr)
-
-pRequestOnConflict :: Text -> Either ApiRequestError  [FieldName]
-pRequestOnConflict oncStr =
-  mapError $ parse pColumns ("failed to parse on_conflict parameter (" <> toS oncStr <> ")") (toS oncStr)
-
-pRequestFilter :: (Text, Text) -> Either ApiRequestError (EmbedPath, Filter)
-pRequestFilter (k, v) = mapError $ (,) <$> path <*> (Filter <$> fld <*> oper)
-  where
-    treePath = parse pTreePath ("failed to parser tree path (" ++ toS k ++ ")") $ toS k
-    oper = parse (pOpExpr pSingleVal) ("failed to parse filter (" ++ toS v ++ ")") $ toS v
-    path = fst <$> treePath
-    fld = snd <$> treePath
-
-pRequestOrder :: (Text, Text) -> Either ApiRequestError (EmbedPath, [OrderTerm])
-pRequestOrder (k, v) = mapError $ (,) <$> path <*> ord'
-  where
-    treePath = parse pTreePath ("failed to parser tree path (" ++ toS k ++ ")") $ toS k
-    path = fst <$> treePath
-    ord' = parse pOrder ("failed to parse order (" ++ toS v ++ ")") $ toS v
-
-pRequestRange :: (Text, NonnegRange) -> Either ApiRequestError (EmbedPath, NonnegRange)
-pRequestRange (k, v) = mapError $ (,) <$> path <*> pure v
-  where
-    treePath = parse pTreePath ("failed to parser tree path (" ++ toS k ++ ")") $ toS k
-    path = fst <$> treePath
-
-pRequestLogicTree :: (Text, Text) -> Either ApiRequestError (EmbedPath, LogicTree)
-pRequestLogicTree (k, v) = mapError $ (,) <$> embedPath <*> logicTree
-  where
-    path = parse pLogicPath ("failed to parser logic path (" ++ toS k ++ ")") $ toS k
-    embedPath = fst <$> path
-    logicTree = do
-      op <- snd <$> path
-      -- Concat op and v to make pLogicTree argument regular,
-      -- in the form of "?and=and(.. , ..)" instead of "?and=(.. , ..)"
-      parse pLogicTree ("failed to parse logic tree (" ++ toS v ++ ")") $ toS (op <> v)
-
-pRequestColumns :: Maybe Text -> Either ApiRequestError (Maybe (S.Set FieldName))
-pRequestColumns colStr =
-  case colStr of
-    Just str ->
-      mapError $ Just . S.fromList <$> parse pColumns ("failed to parse columns parameter (" <> toS str <> ")") (toS str)
-    _ -> Right Nothing
-
-ws :: Parser Text
-ws = toS <$> many (oneOf " \t")
-
-lexeme :: Parser a -> Parser a
-lexeme p = ws *> p <* ws
-
-pTreePath :: Parser (EmbedPath, Field)
-pTreePath = do
-  p <- pFieldName `sepBy1` pDelimiter
-  jp <- option [] pJsonPath
-  return (init p, (last p, jp))
-
-pFieldForest :: Parser [Tree SelectItem]
-pFieldForest = pFieldTree `sepBy1` lexeme (char ',')
-  where
-    pFieldTree :: Parser (Tree SelectItem)
-    pFieldTree =  try (Node <$> pRelationSelect <*> between (char '(') (char ')') pFieldForest) <|>
-                  Node <$> pFieldSelect <*> pure []
-
-pStar :: Parser Text
-pStar = string "*" $> "*"
-
-pFieldName :: Parser Text
-pFieldName =
-  pQuotedValue <|>
-  intercalate "-" . map toS <$> (many1 (letter <|> digit <|> oneOf "_ ") `sepBy1` dash) <?>
-  "field name (* or [a..z0..9_])"
-  where
-    isDash :: GenParser Char st ()
-    isDash = try ( char '-' >> notFollowedBy (char '>') )
-    dash :: Parser Char
-    dash = isDash $> '-'
-
-pJsonPath :: Parser JsonPath
-pJsonPath = many pJsonOperation
-  where
-    pJsonOperation :: Parser JsonOperation
-    pJsonOperation = pJsonArrow <*> pJsonOperand
-
-    pJsonArrow   =
-      try (string "->>" $> J2Arrow) <|>
-      try (string "->" $> JArrow)
-
-    pJsonOperand =
-      let pJKey = JKey . toS <$> pFieldName
-          pJIdx = JIdx . toS <$> ((:) <$> option '+' (char '-') <*> many1 digit) <* pEnd
-          pEnd = try (void $ lookAhead (string "->")) <|>
-                 try (void $ lookAhead (string "::")) <|>
-                 try eof in
-      try pJIdx <|> try pJKey
-
-pField :: Parser Field
-pField = lexeme $ (,) <$> pFieldName <*> option [] pJsonPath
-
-aliasSeparator :: Parser ()
-aliasSeparator = char ':' >> notFollowedBy (char ':')
-
-pRelationSelect :: Parser SelectItem
-pRelationSelect = lexeme $ try ( do
-    alias <- optionMaybe ( try(pFieldName <* aliasSeparator) )
-    fld <- pField
-    prm1 <- optionMaybe pEmbedParam
-    prm2 <- optionMaybe pEmbedParam
-    return (fld, Nothing, alias, embedParamHint prm1 <|> embedParamHint prm2, embedParamJoin prm1 <|> embedParamJoin prm2)
-  )
-  where
-    pEmbedParam :: Parser EmbedParam
-    pEmbedParam =
-      char '!' *> (
-        try (string "left"  $> EPJoinType JTLeft)  <|>
-        try (string "inner" $> EPJoinType JTInner) <|>
-        try (EPHint <$> pFieldName))
-    embedParamHint prm = case prm of
-      Just (EPHint hint) -> Just hint
-      _                  -> Nothing
-    embedParamJoin prm = case prm of
-      Just (EPJoinType jt) -> Just jt
-      _                    -> Nothing
-
-pFieldSelect :: Parser SelectItem
-pFieldSelect = lexeme $
-  try (
-    do
-      alias <- optionMaybe ( try(pFieldName <* aliasSeparator) )
-      fld <- pField
-      cast' <- optionMaybe (string "::" *> many letter)
-      return (fld, toS <$> cast', alias, Nothing, Nothing)
-  )
-  <|> do
-    s <- pStar
-    return ((s, []), Nothing, Nothing, Nothing, Nothing)
-
-pOpExpr :: Parser SingleVal -> Parser OpExpr
-pOpExpr pSVal = try ( string "not" *> pDelimiter *> (OpExpr True <$> pOperation)) <|> OpExpr False <$> pOperation
-  where
-    pOperation :: Parser Operation
-    pOperation =
-          Op . toS <$> foldl1 (<|>) (try . ((<* pDelimiter) . string) . toS <$> M.keys ops) <*> pSVal
-      <|> In <$> (try (string "in" *> pDelimiter) *> pListVal)
-      <|> Is <$> (try (string "is" *> pDelimiter) *> pTriVal)
-      <|> pFts
-      <?> "operator (eq, gt, ...)"
-
-    pTriVal = try (string "null"    $> TriNull)
-          <|> try (string "unknown" $> TriUnknown)
-          <|> try (string "true"    $> TriTrue)
-          <|> try (string "false"   $> TriFalse)
-          <?> "null or trilean value (unknown, true, false)"
-
-    pFts = do
-      op   <- foldl1 (<|>) (try . string . toS <$> ftsOps)
-      lang <- optionMaybe $ try (between (char '(') (char ')') (many (letter <|> digit <|> oneOf "_")))
-      pDelimiter >> Fts (toS op) (toS <$> lang) <$> pSVal
-
-    ops = M.filterWithKey (const . flip notElem ("in":"is":ftsOps)) operators
-    ftsOps = M.keys ftsOperators
-
-pSingleVal :: Parser SingleVal
-pSingleVal = toS <$> many anyChar
-
-pListVal :: Parser ListVal
-pListVal = lexeme (char '(') *> pListElement `sepBy1` char ',' <* lexeme (char ')')
-
-pListElement :: Parser Text
-pListElement = try (pQuotedValue <* notFollowedBy (noneOf ",)")) <|> (toS <$> many (noneOf ",)"))
-
-pQuotedValue :: Parser Text
-pQuotedValue = toS <$> (char '"' *> many pCharsOrSlashed <* char '"')
-  where
-    pCharsOrSlashed = noneOf "\\\"" <|> (char '\\' *> anyChar)
-
-pDelimiter :: Parser Char
-pDelimiter = char '.' <?> "delimiter (.)"
-
-pOrder :: Parser [OrderTerm]
-pOrder = lexeme pOrderTerm `sepBy1` char ','
-
-pOrderTerm :: Parser OrderTerm
-pOrderTerm = do
-  fld <- pField
-  dir <- optionMaybe $
-         try (pDelimiter *> string "asc" $> OrderAsc) <|>
-         try (pDelimiter *> string "desc" $> OrderDesc)
-  nls <- optionMaybe pNulls <* pEnd <|>
-         pEnd $> Nothing
-  return $ OrderTerm fld dir nls
-  where
-    pNulls = try (pDelimiter *> string "nullsfirst" $> OrderNullsFirst) <|>
-             try (pDelimiter *> string "nullslast"  $> OrderNullsLast)
-    pEnd = try (void $ lookAhead (char ',')) <|>
-           try eof
-
-pLogicTree :: Parser LogicTree
-pLogicTree = Stmnt <$> try pLogicFilter
-             <|> Expr <$> pNot <*> pLogicOp <*> (lexeme (char '(') *> pLogicTree `sepBy1` lexeme (char ',') <* lexeme (char ')'))
-  where
-    pLogicFilter :: Parser Filter
-    pLogicFilter = Filter <$> pField <* pDelimiter <*> pOpExpr pLogicSingleVal
-    pNot :: Parser Bool
-    pNot = try (string "not" *> pDelimiter $> True)
-           <|> pure False
-           <?> "negation operator (not)"
-    pLogicOp :: Parser LogicOperator
-    pLogicOp = try (string "and" $> And)
-               <|> string "or" $> Or
-               <?> "logic operator (and, or)"
-
-pLogicSingleVal :: Parser SingleVal
-pLogicSingleVal = try (pQuotedValue <* notFollowedBy (noneOf ",)")) <|> try pPgArray <|> (toS <$> many (noneOf ",)"))
-  where
-    pPgArray :: Parser Text
-    pPgArray =  do
-      a <- string "{"
-      b <- many (noneOf "{}")
-      c <- string "}"
-      pure (toS $ a ++ b ++ c)
-
-pLogicPath :: Parser (EmbedPath, Text)
-pLogicPath = do
-  path <- pFieldName `sepBy1` pDelimiter
-  let op = last path
-      notOp = "not." <> op
-  return (filter (/= "not") (init path), if "not" `elem` path then notOp else op)
-
-pColumns :: Parser [FieldName]
-pColumns = pFieldName `sepBy1` lexeme (char ',')
-
-mapError :: Either ParseError a -> Either ApiRequestError a
-mapError = mapLeft translateError
-  where
-    translateError e =
-      ParseRequestError message details
-      where
-        message = show $ errorPos e
-        details = strip $ replace "\n" " " $ toS
-           $ showErrorMessages "or" "unknown parse error" "expecting" "unexpected" "end of input" (errorMessages e)
@@ -155,7 +155,7 @@ instance ToAppliedHeader PreferResolution
 --
 -- From https://tools.ietf.org/html/rfc7240#section-4.2
 data PreferRepresentation
-  = Full        -- ^ Return the body plus the Location header(in case of POST).
+  = Full        -- ^ Return the body.
  | HeadersOnly -- ^ Return the Location header(in case of POST). This needs a SELECT privilege on the pk.
  | None        -- ^ Return nothing from the mutated data.
  deriving Eq
@@ -0,0 +1,523 @@
+-- |
+-- Module      : PostgREST.Request.QueryParams
+-- Description : Parser for PostgREST Query paramters
+--
+-- This module is in charge of parsing all the querystring values in an url, e.g.
+-- the select, id, order in `/projects?select=id,name&id=eq.1&order=id,name.desc`.
+{-# LANGUAGE LambdaCase    #-}
+{-# LANGUAGE TupleSections #-}
+module PostgREST.Request.QueryParams
+  ( parse
+  , QueryParams(..)
+  , pRequestRange
+  ) where
+
+import qualified Data.ByteString.Char8         as BS
+import qualified Data.HashMap.Strict           as HM
+import qualified Data.List                     as L
+import qualified Data.Set                      as S
+import qualified Data.Text                     as T
+import qualified Data.Text.Encoding            as T
+import qualified Network.HTTP.Base             as HTTP
+import qualified Network.HTTP.Types.URI        as HTTP
+import qualified Text.ParserCombinators.Parsec as P
+
+import Control.Arrow                 ((***))
+import Data.Either.Combinators       (mapLeft)
+import Data.List                     (init, last)
+import Data.Ranged.Boundaries        (Boundary (..))
+import Data.Ranged.Ranges            (Range (..))
+import Data.Tree                     (Tree (..))
+import Text.Parsec.Error             (errorMessages,
+                                      showErrorMessages)
+import Text.Parsec.Prim              (parserFail)
+import Text.ParserCombinators.Parsec (GenParser, ParseError, Parser,
+                                      anyChar, between, char, digit,
+                                      eof, errorPos, letter,
+                                      lookAhead, many1, noneOf,
+                                      notFollowedBy, oneOf,
+                                      optionMaybe, sepBy1, string,
+                                      try, (<?>))
+
+import PostgREST.DbStructure.Identifiers (FieldName)
+import PostgREST.RangeQuery              (NonnegRange, allRange,
+                                          rangeGeq, rangeLimit,
+                                          rangeOffset, restrictRange)
+
+import PostgREST.Request.ReadQuery (SelectItem)
+import PostgREST.Request.Types     (EmbedParam (..), EmbedPath, Field,
+                                    Filter (..), FtsOperator (..),
+                                    JoinType (..), JsonOperand (..),
+                                    JsonOperation (..), JsonPath,
+                                    ListVal, LogicOperator (..),
+                                    LogicTree (..), OpExpr (..),
+                                    Operation (..),
+                                    OrderDirection (..),
+                                    OrderNulls (..), OrderTerm (..),
+                                    QPError (..), SimpleOperator (..),
+                                    SingleVal, TrileanVal (..))
+
+import Protolude hiding (try)
+
+
+-- $setup
+-- Setup for doctests
+-- >>> import Text.Pretty.Simple (pPrint)
+-- >>> deriving instance Show QPError
+-- >>> deriving instance Show TrileanVal
+-- >>> deriving instance Show FtsOperator
+-- >>> deriving instance Show SimpleOperator
+-- >>> deriving instance Show Operation
+-- >>> deriving instance Show OpExpr
+-- >>> deriving instance Show JsonOperand
+-- >>> deriving instance Show JsonOperation
+-- >>> deriving instance Show Filter
+-- >>> deriving instance Show JoinType
+
+data QueryParams =
+  QueryParams
+    { qsCanonical      :: ByteString
+    -- ^ Canonical representation of the query params, sorted alphabetically
+    , qsParams         :: [(Text, Text)]
+    -- ^ Parameters for RPC calls
+    , qsRanges         :: HM.HashMap Text (Range Integer)
+    -- ^ Ranges derived from &limit and &offset params
+    , qsOrder          :: [(EmbedPath, [OrderTerm])]
+    -- ^ &order parameters for each level
+    , qsLogic          :: [(EmbedPath, LogicTree)]
+    -- ^ &and and &or parameters used for complex boolean logic
+    , qsColumns        :: Maybe (S.Set FieldName)
+    -- ^ &columns parameter and payload
+    , qsSelect         :: [Tree SelectItem]
+    -- ^ &select parameter used to shape the response
+    , qsFilters        :: [(EmbedPath, Filter)]
+    -- ^ Filters on the result from e.g. &id=e.10
+    , qsFiltersRoot    :: [Filter]
+    -- ^ Subset of the filters that apply on the root table. These are used on UPDATE/DELETE.
+    , qsFiltersNotRoot :: [(EmbedPath, Filter)]
+    -- ^ Subset of the filters that do not apply on the root table
+    , qsFilterFields   :: S.Set FieldName
+    -- ^ Set of fields that filters apply to
+    , qsOnConflict     :: Maybe [FieldName]
+    -- ^ &on_conflict parameter used to upsert on specific unique keys
+    }
+
+-- |
+-- Parse query parameters from a query string like "id=eq.1&select=name".
+--
+-- The canonical representation of the query string has paramters sorted alphabetically:
+--
+-- >>> qsCanonical <$> parse "a=1&c=3&b=2&d"
+-- Right "a=1&b=2&c=3&d="
+--
+-- 'select' is a reserved parameter that selects the fields to be returned:
+--
+-- >>> qsSelect <$> parse "select=name,location"
+-- Right [Node {rootLabel = (("name",[]),Nothing,Nothing,Nothing,Nothing), subForest = []},Node {rootLabel = (("location",[]),Nothing,Nothing,Nothing,Nothing), subForest = []}]
+--
+-- Filters are parameters whose value contains an operator, separated by a '.' from its value:
+--
+-- >>> qsFilters <$> parse "a.b=eq.0"
+-- Right [(["a"],Filter {field = ("b",[]), opExpr = OpExpr False (Op OpEqual "0")})]
+--
+-- If the operator specified in a filter does not exist, parsing the query string fails:
+--
+-- >>> qsFilters <$> parse "a.b=noop.0"
+-- Left (QPError "\"failed to parse filter (noop.0)\" (line 1, column 6)" "unknown single value operator noop")
+parse :: ByteString -> Either QPError QueryParams
+parse qs =
+  QueryParams
+    canonical
+    params
+    ranges
+    <$> pRequestOrder `traverse` order
+    <*> pRequestLogicTree `traverse` logic
+    <*> pRequestColumns columns
+    <*> pRequestSelect select
+    <*> pRequestFilter `traverse` filters
+    <*> (fmap snd <$> (pRequestFilter `traverse` filtersRoot))
+    <*> pRequestFilter `traverse` filtersNotRoot
+    <*> pure (S.fromList (fst <$> filters))
+    <*> sequenceA (pRequestOnConflict <$> onConflict)
+  where
+    logic = filter (endingIn ["and", "or"] . fst) nonemptyParams
+    select = fromMaybe "*" $ lookupParam "select"
+    onConflict = lookupParam "on_conflict"
+    columns = lookupParam "columns"
+    order = filter (endingIn ["order"] . fst) nonemptyParams
+    limits = filter (endingIn ["limit"] . fst) nonemptyParams
+    -- Replace .offset ending with .limit to be able to match those params later in a map
+    offsets = first (replaceLast "limit") <$> filter (endingIn ["offset"] . fst) nonemptyParams
+    lookupParam :: Text -> Maybe Text
+    lookupParam needle = toS <$> join (L.lookup needle qParams)
+    nonemptyParams = mapMaybe (\(k, v) -> (k,) <$> v) qParams
+
+    qString = HTTP.parseQueryReplacePlus True qs
+
+    qParams = [(T.decodeUtf8 k, T.decodeUtf8 <$> v)|(k,v) <- qString]
+
+    canonical =
+      BS.pack $ HTTP.urlEncodeVars
+        . L.sortOn fst
+        . map (join (***) BS.unpack . second (fromMaybe mempty))
+        $ qString
+
+    endingIn:: [Text] -> Text -> Bool
+    endingIn xx key = lastWord `elem` xx
+      where lastWord = L.last $ T.split (== '.') key
+
+    (filters, params) = L.partition isParam filtersAndParams
+    isParam (k, v) = isEmbedPath k || hasOperator v || hasFtsOperator v
+
+    filtersAndParams = filter (isFilterOrParam . fst)  nonemptyParams
+    isFilterOrParam k = not (endingIn reservedEmbeddable k) && notElem k reserved
+    reserved = ["select", "columns", "on_conflict"]
+    reservedEmbeddable = ["order", "limit", "offset", "and", "or"]
+
+    (filtersNotRoot, filtersRoot) = L.partition isNotRoot filters
+    isNotRoot = flip T.isInfixOf "." . fst
+
+    -- TODO: These checks are redundant to the parsers, should use parsers to differentiate params
+    hasOperator val =
+      case T.splitOn "." val of
+        "not" : _ : _ -> True
+        "is" : _      -> True
+        "in" : _      -> True
+        x : _         -> isJust (operator x) || isJust (ftsOperator x)
+        _             -> False
+
+    hasFtsOperator val =
+      case T.splitOn "(" val of
+        x : _ : _ -> isJust $ ftsOperator x
+        _         -> False
+
+    isEmbedPath = T.isInfixOf "."
+    replaceLast x s = T.intercalate "." $ L.init (T.split (=='.') s) <> [x]
+
+    ranges :: HM.HashMap Text (Range Integer)
+    ranges = HM.unionWith f limitParams offsetParams
+      where
+        f rl ro = Range (BoundaryBelow o) (BoundaryAbove $ o + l - 1)
+          where
+            l = fromMaybe 0 $ rangeLimit rl
+            o = rangeOffset ro
+
+        limitParams =
+          HM.fromList [(k, restrictRange (readMaybe v) allRange) | (k,v) <- limits]
+
+        offsetParams =
+          HM.fromList [(k, maybe allRange rangeGeq (readMaybe v)) | (k,v) <- offsets]
+
+operator :: Text -> Maybe SimpleOperator
+operator = \case
+  "eq"     -> Just OpEqual
+  "gte"    -> Just OpGreaterThanEqual
+  "gt"     -> Just OpGreaterThan
+  "lte"    -> Just OpLessThanEqual
+  "lt"     -> Just OpLessThan
+  "neq"    -> Just OpNotEqual
+  "like"   -> Just OpLike
+  "ilike"  -> Just OpILike
+  "cs"     -> Just OpContains
+  "cd"     -> Just OpContained
+  "ov"     -> Just OpOverlap
+  "sl"     -> Just OpStrictlyLeft
+  "sr"     -> Just OpStrictlyRight
+  "nxr"    -> Just OpNotExtendsRight
+  "nxl"    -> Just OpNotExtendsLeft
+  "adj"    -> Just OpAdjacent
+  "match"  -> Just OpMatch
+  "imatch" -> Just OpIMatch
+  _        -> Nothing
+
+ftsOperator :: Text -> Maybe FtsOperator
+ftsOperator = \case
+  "fts"   -> Just FilterFts
+  "plfts" -> Just FilterFtsPlain
+  "phfts" -> Just FilterFtsPhrase
+  "wfts"  -> Just FilterFtsWebsearch
+  _       -> Nothing
+
+
+-- PARSERS
+
+
+pRequestSelect :: Text -> Either QPError [Tree SelectItem]
+pRequestSelect selStr =
+  mapError $ P.parse pFieldForest ("failed to parse select parameter (" <> toS selStr <> ")") (toS selStr)
+
+pRequestOnConflict :: Text -> Either QPError [FieldName]
+pRequestOnConflict oncStr =
+  mapError $ P.parse pColumns ("failed to parse on_conflict parameter (" <> toS oncStr <> ")") (toS oncStr)
+
+pRequestFilter :: (Text, Text) -> Either QPError (EmbedPath, Filter)
+pRequestFilter (k, v) = mapError $ (,) <$> path <*> (Filter <$> fld <*> oper)
+  where
+    treePath = P.parse pTreePath ("failed to parse tree path (" ++ toS k ++ ")") $ toS k
+    oper = P.parse (pOpExpr pSingleVal) ("failed to parse filter (" ++ toS v ++ ")") $ toS v
+    path = fst <$> treePath
+    fld = snd <$> treePath
+
+pRequestOrder :: (Text, Text) -> Either QPError (EmbedPath, [OrderTerm])
+pRequestOrder (k, v) = mapError $ (,) <$> path <*> ord'
+  where
+    treePath = P.parse pTreePath ("failed to parse tree path (" ++ toS k ++ ")") $ toS k
+    path = fst <$> treePath
+    ord' = P.parse pOrder ("failed to parse order (" ++ toS v ++ ")") $ toS v
+
+pRequestRange :: (Text, NonnegRange) -> Either QPError (EmbedPath, NonnegRange)
+pRequestRange (k, v) = mapError $ (,) <$> path <*> pure v
+  where
+    treePath = P.parse pTreePath ("failed to parse tree path (" ++ toS k ++ ")") $ toS k
+    path = fst <$> treePath
+
+pRequestLogicTree :: (Text, Text) -> Either QPError (EmbedPath, LogicTree)
+pRequestLogicTree (k, v) = mapError $ (,) <$> embedPath <*> logicTree
+  where
+    path = P.parse pLogicPath ("failed to parse logic path (" ++ toS k ++ ")") $ toS k
+    embedPath = fst <$> path
+    logicTree = do
+      op <- snd <$> path
+      -- Concat op and v to make pLogicTree argument regular,
+      -- in the form of "?and=and(.. , ..)" instead of "?and=(.. , ..)"
+      P.parse pLogicTree ("failed to parse logic tree (" ++ toS v ++ ")") $ toS (op <> v)
+
+pRequestColumns :: Maybe Text -> Either QPError (Maybe (S.Set FieldName))
+pRequestColumns colStr =
+  case colStr of
+    Just str ->
+      mapError $ Just . S.fromList <$> P.parse pColumns ("failed to parse columns parameter (" <> toS str <> ")") (toS str)
+    _ -> Right Nothing
+
+ws :: Parser Text
+ws = toS <$> many (oneOf " \t")
+
+lexeme :: Parser a -> Parser a
+lexeme p = ws *> p <* ws
+
+pTreePath :: Parser (EmbedPath, Field)
+pTreePath = do
+  p <- pFieldName `sepBy1` pDelimiter
+  jp <- P.option [] pJsonPath
+  return (init p, (last p, jp))
+
+pFieldForest :: Parser [Tree SelectItem]
+pFieldForest = pFieldTree `sepBy1` lexeme (char ',')
+  where
+    pFieldTree :: Parser (Tree SelectItem)
+    pFieldTree =  try (Node <$> pRelationSelect <*> between (char '(') (char ')') pFieldForest) <|>
+                  Node <$> pFieldSelect <*> pure []
+
+pStar :: Parser Text
+pStar = string "*" $> "*"
+
+pFieldName :: Parser Text
+pFieldName =
+  pQuotedValue <|>
+  T.intercalate "-" . map toS <$> (many1 pIdentifierChar `sepBy1` dash) <?>
+  "field name (* or [a..z0..9_])"
+  where
+    isDash :: GenParser Char st ()
+    isDash = try ( char '-' >> notFollowedBy (char '>') )
+    dash :: Parser Char
+    dash = isDash $> '-'
+
+-- |
+-- Parse json operators in select, order and filters
+--
+-- >>> P.parse pJsonPath "" "->text"
+-- Right [JArrow {jOp = JKey {jVal = "text"}}]
+--
+-- >>> P.parse pJsonPath "" "->1"
+-- Right [JArrow {jOp = JIdx {jVal = "+1"}}]
+--
+-- >>> P.parse pJsonPath "" "->>text"
+-- Right [J2Arrow {jOp = JKey {jVal = "text"}}]
+--
+-- >>> P.parse pJsonPath "" "->>1"
+-- Right [J2Arrow {jOp = JIdx {jVal = "+1"}}]
+--
+-- >>> P.parse pJsonPath "" "->0,other"
+-- Right [JArrow {jOp = JIdx {jVal = "+0"}}]
+--
+-- >>> P.parse pJsonPath "" "->0.desc"
+-- Right [JArrow {jOp = JIdx {jVal = "+0"}}]
+pJsonPath :: Parser JsonPath
+pJsonPath = many pJsonOperation
+  where
+    pJsonOperation :: Parser JsonOperation
+    pJsonOperation = pJsonArrow <*> pJsonOperand
+
+    pJsonArrow   =
+      try (string "->>" $> J2Arrow) <|>
+      try (string "->" $> JArrow)
+
+    pJsonOperand =
+      let pJKey = JKey . toS <$> pFieldName
+          pJIdx = JIdx . toS <$> ((:) <$> P.option '+' (char '-') <*> many1 digit) <* pEnd
+          pEnd = try (void $ lookAhead (string "->")) <|>
+                 try (void $ lookAhead (string "::")) <|>
+                 try (void $ lookAhead (string ".")) <|>
+                 try (void $ lookAhead (string ",")) <|>
+                 try eof in
+      try pJIdx <|> try pJKey
+
+pField :: Parser Field
+pField = lexeme $ (,) <$> pFieldName <*> P.option [] pJsonPath
+
+aliasSeparator :: Parser ()
+aliasSeparator = char ':' >> notFollowedBy (char ':')
+
+pRelationSelect :: Parser SelectItem
+pRelationSelect = lexeme $ try ( do
+    alias <- optionMaybe ( try(pFieldName <* aliasSeparator) )
+    fld <- pField
+    prm1 <- optionMaybe pEmbedParam
+    prm2 <- optionMaybe pEmbedParam
+    return (fld, Nothing, alias, embedParamHint prm1 <|> embedParamHint prm2, embedParamJoin prm1 <|> embedParamJoin prm2)
+  )
+  where
+    pEmbedParam :: Parser EmbedParam
+    pEmbedParam =
+      char '!' *> (
+        try (string "left"  $> EPJoinType JTLeft)  <|>
+        try (string "inner" $> EPJoinType JTInner) <|>
+        try (EPHint <$> pFieldName))
+    embedParamHint prm = case prm of
+      Just (EPHint hint) -> Just hint
+      _                  -> Nothing
+    embedParamJoin prm = case prm of
+      Just (EPJoinType jt) -> Just jt
+      _                    -> Nothing
+
+pFieldSelect :: Parser SelectItem
+pFieldSelect = lexeme $
+  try (
+    do
+      alias <- optionMaybe ( try(pFieldName <* aliasSeparator) )
+      fld <- pField
+      cast' <- optionMaybe (string "::" *> many pIdentifierChar)
+      return (fld, toS <$> cast', alias, Nothing, Nothing)
+  )
+  <|> do
+    s <- pStar
+    return ((s, []), Nothing, Nothing, Nothing, Nothing)
+
+pOpExpr :: Parser SingleVal -> Parser OpExpr
+pOpExpr pSVal = try ( string "not" *> pDelimiter *> (OpExpr True <$> pOperation)) <|> OpExpr False <$> pOperation
+  where
+    pOperation :: Parser Operation
+    pOperation = pIn <|> pIs <|> try pFts <|> pOp <?> "operator (eq, gt, ...)"
+
+    pIn = In <$> (try (string "in" *> pDelimiter) *> pListVal)
+    pIs = Is <$> (try (string "is" *> pDelimiter) *> pTriVal)
+
+    pOp = do
+      opStr <- try (P.manyTill anyChar (try pDelimiter))
+      op <- parseMaybe ("unknown single value operator " <> opStr) . operator $ toS opStr
+      Op op <$> pSVal
+
+    pTriVal = try (ciString "null"    $> TriNull)
+          <|> try (ciString "unknown" $> TriUnknown)
+          <|> try (ciString "true"    $> TriTrue)
+          <|> try (ciString "false"   $> TriFalse)
+          <?> "null or trilean value (unknown, true, false)"
+
+    pFts = do
+      opStr <- try (P.many (noneOf ".("))
+      op <- parseMaybe ("unknown fts operator " <> opStr) . ftsOperator $ toS opStr
+      lang <- optionMaybe $ try (between (char '(') (char ')') $ many pIdentifierChar)
+      pDelimiter >> Fts op (toS <$> lang) <$> pSVal
+
+    parseMaybe :: [Char] -> Maybe a -> Parser a
+    parseMaybe err Nothing = parserFail err
+    parseMaybe _ (Just x)  = pure x
+
+    -- case insensitive char and string
+    ciChar :: Char -> GenParser Char state Char
+    ciChar c = char c <|> char (toUpper c)
+    ciString :: [Char] -> GenParser Char state [Char]
+    ciString = traverse ciChar
+
+pSingleVal :: Parser SingleVal
+pSingleVal = toS <$> many anyChar
+
+pListVal :: Parser ListVal
+pListVal = lexeme (char '(') *> pListElement `sepBy1` char ',' <* lexeme (char ')')
+
+pListElement :: Parser Text
+pListElement = try (pQuotedValue <* notFollowedBy (noneOf ",)")) <|> (toS <$> many (noneOf ",)"))
+
+pQuotedValue :: Parser Text
+pQuotedValue = toS <$> (char '"' *> many pCharsOrSlashed <* char '"')
+  where
+    pCharsOrSlashed = noneOf "\\\"" <|> (char '\\' *> anyChar)
+
+pDelimiter :: Parser Char
+pDelimiter = char '.' <?> "delimiter (.)"
+
+pOrder :: Parser [OrderTerm]
+pOrder = lexeme pOrderTerm `sepBy1` char ','
+
+pOrderTerm :: Parser OrderTerm
+pOrderTerm = do
+  fld <- pField
+  dir <- optionMaybe $
+         try (pDelimiter *> string "asc" $> OrderAsc) <|>
+         try (pDelimiter *> string "desc" $> OrderDesc)
+  nls <- optionMaybe pNulls <* pEnd <|>
+         pEnd $> Nothing
+  return $ OrderTerm fld dir nls
+  where
+    pNulls = try (pDelimiter *> string "nullsfirst" $> OrderNullsFirst) <|>
+             try (pDelimiter *> string "nullslast"  $> OrderNullsLast)
+    pEnd = try (void $ lookAhead (char ',')) <|>
+           try eof
+
+pLogicTree :: Parser LogicTree
+pLogicTree = Stmnt <$> try pLogicFilter
+             <|> Expr <$> pNot <*> pLogicOp <*> (lexeme (char '(') *> pLogicTree `sepBy1` lexeme (char ',') <* lexeme (char ')'))
+  where
+    pLogicFilter :: Parser Filter
+    pLogicFilter = Filter <$> pField <* pDelimiter <*> pOpExpr pLogicSingleVal
+    pNot :: Parser Bool
+    pNot = try (string "not" *> pDelimiter $> True)
+           <|> pure False
+           <?> "negation operator (not)"
+    pLogicOp :: Parser LogicOperator
+    pLogicOp = try (string "and" $> And)
+               <|> string "or" $> Or
+               <?> "logic operator (and, or)"
+
+pLogicSingleVal :: Parser SingleVal
+pLogicSingleVal = try (pQuotedValue <* notFollowedBy (noneOf ",)")) <|> try pPgArray <|> (toS <$> many (noneOf ",)"))
+  where
+    pPgArray :: Parser Text
+    pPgArray =  do
+      a <- string "{"
+      b <- many (noneOf "{}")
+      c <- string "}"
+      pure (toS $ a ++ b ++ c)
+
+pLogicPath :: Parser (EmbedPath, Text)
+pLogicPath = do
+  path <- pFieldName `sepBy1` pDelimiter
+  let op = last path
+      notOp = "not." <> op
+  return (filter (/= "not") (init path), if "not" `elem` path then notOp else op)
+
+pColumns :: Parser [FieldName]
+pColumns = pFieldName `sepBy1` lexeme (char ',')
+
+pIdentifierChar :: Parser Char
+pIdentifierChar = letter <|> digit <|> oneOf "_ $"
+
+mapError :: Either ParseError a -> Either QPError a
+mapError = mapLeft translateError
+  where
+    translateError e =
+      QPError message details
+      where
+        message = show $ errorPos e
+        details = T.strip $ T.replace "\n" " " $ toS
+           $ showErrorMessages "or" "unknown parse error" "expecting" "unexpected" "end of input" (errorMessages e)
@@ -0,0 +1,46 @@
+module PostgREST.Request.ReadQuery
+  ( ReadNode
+  , ReadQuery(..)
+  , ReadRequest
+  , SelectItem
+  , fstFieldNames
+  ) where
+
+import Data.Tree (Tree (..))
+
+import PostgREST.DbStructure.Identifiers  (FieldName,
+                                           QualifiedIdentifier)
+import PostgREST.DbStructure.Relationship (Relationship)
+import PostgREST.RangeQuery               (NonnegRange)
+import PostgREST.Request.Types            (Alias, Cast, Depth, Field,
+                                           Hint, JoinCondition,
+                                           JoinType, LogicTree,
+                                           NodeName, OrderTerm)
+
+
+import Protolude
+
+type ReadRequest = Tree ReadNode
+
+type ReadNode =
+  (ReadQuery, (NodeName, Maybe Relationship, Maybe Alias, Maybe Hint, Maybe JoinType, Depth))
+
+-- | The select value in `/tbl?select=alias:field::cast`
+type SelectItem = (Field, Maybe Cast, Maybe Alias, Maybe Hint, Maybe JoinType)
+
+data ReadQuery = Select
+  { select         :: [SelectItem]
+  , from           :: QualifiedIdentifier
+  , fromAlias      :: Maybe Alias
+  -- ^ A table alias is used in case of self joins
+  , where_         :: [LogicTree]
+  , joinConditions :: [JoinCondition]
+  , order          :: [OrderTerm]
+  , range_         :: NonnegRange
+  }
+  deriving (Eq)
+
+-- First level FieldNames(e.g get a,b from /table?select=a,b,other(c,d))
+fstFieldNames :: ReadRequest -> [FieldName]
+fstFieldNames (Node (sel, _) _) =
+  fst . (\(f, _, _, _, _) -> f) <$> select sel
@@ -1,8 +1,10 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 module PostgREST.Request.Types
  ( Alias
+  , Cast
  , Depth
  , EmbedParam(..)
+  , ApiRequestError(..)
  , EmbedPath
  , Field
  , Filter(..)
@@ -18,62 +20,58 @@ module PostgREST.Request.Types
  , ListVal
  , LogicOperator(..)
  , LogicTree(..)
-  , MutateQuery(..)
-  , MutateRequest
  , NodeName
  , OpExpr(..)
  , Operation (..)
  , OrderDirection(..)
  , OrderNulls(..)
  , OrderTerm(..)
-  , ReadNode
-  , ReadQuery(..)
-  , ReadRequest
-  , SelectItem
+  , QPError(..)
  , SingleVal
  , TrileanVal(..)
-  , fstFieldNames
+  , SimpleOperator(..)
+  , FtsOperator(..)
  ) where

 import qualified Data.ByteString.Lazy as LBS
-import qualified Data.Set             as S
-
-import Data.Tree (Tree (..))

 import PostgREST.DbStructure.Identifiers  (FieldName,
                                           QualifiedIdentifier)
-import PostgREST.DbStructure.Proc         (ProcParam (..))
+import PostgREST.DbStructure.Proc         (ProcDescription (..),
+                                           ProcParam (..))
 import PostgREST.DbStructure.Relationship (Relationship)
-import PostgREST.RangeQuery               (NonnegRange)
-import PostgREST.Request.Preferences      (PreferResolution)
+import PostgREST.MediaType                (MediaType (..))

 import Protolude


-type ReadRequest = Tree ReadNode
-type MutateRequest = MutateQuery
-type CallRequest = CallQuery

-type ReadNode =
-  (ReadQuery, (NodeName, Maybe Relationship, Maybe Alias, Maybe Hint, Maybe JoinType, Depth))
+data ApiRequestError
+  = AmbiguousRelBetween Text Text [Relationship]
+  | AmbiguousRpc [ProcDescription]
+  | MediaTypeError [ByteString]
+  | InvalidBody ByteString
+  | InvalidFilters
+  | InvalidRange
+  | InvalidRpcMethod ByteString
+  | LimitNoOrderError
+  | NotFound
+  | NoRelBetween Text Text Text
+  | NoRpc Text Text [Text] Bool MediaType Bool
+  | NotEmbedded Text
+  | ParseRequestError Text Text
+  | PutRangeNotAllowedError
+  | QueryParamError QPError
+  | UnacceptableSchema [Text]
+  | UnsupportedMethod ByteString
+
+data QPError = QPError Text Text
+
+type CallRequest = CallQuery

 type NodeName = Text
 type Depth = Integer

-data ReadQuery = Select
-  { select         :: [SelectItem]
-  , from           :: QualifiedIdentifier
-  -- ^ A table alias is used in case of self joins
-  , fromAlias      :: Maybe Alias
-  -- ^ Only used for Many to Many joins. Parent and Child joins use explicit joins.
-  , implicitJoins  :: [QualifiedIdentifier]
-  , where_         :: [LogicTree]
-  , joinConditions :: [JoinCondition]
-  , order          :: [OrderTerm]
-  , range_         :: NonnegRange
-  }
-  deriving (Eq)
-
 data JoinCondition =
  JoinCondition
    (QualifiedIdentifier, FieldName)
@@ -97,28 +95,6 @@ data OrderNulls
  | OrderNullsLast
  deriving (Eq)

-data MutateQuery
-  = Insert
-      { in_        :: QualifiedIdentifier
-      , insCols    :: S.Set FieldName
-      , insBody    :: Maybe LBS.ByteString
-      , onConflict :: Maybe (PreferResolution, [FieldName])
-      , where_     :: [LogicTree]
-      , returning  :: [FieldName]
-      }
-  | Update
-      { in_       :: QualifiedIdentifier
-      , updCols   :: S.Set FieldName
-      , updBody   :: Maybe LBS.ByteString
-      , where_    :: [LogicTree]
-      , returning :: [FieldName]
-      }
-  | Delete
-      { in_       :: QualifiedIdentifier
-      , where_    :: [LogicTree]
-      , returning :: [FieldName]
-      }
-
 data CallQuery = FunctionCall
  { funCQi           :: QualifiedIdentifier
  , funCParams       :: CallParams
@@ -132,9 +108,6 @@ data CallParams
  = KeyParams [ProcParam] -- ^ Call with key params: func(a := val1, b:= val2)
  | OnePosParam ProcParam -- ^ Call with positional params(only one supported): func(val)

-- | The select value in `/tbl?select=alias:field::cast`
-type SelectItem = (Field, Maybe Cast, Maybe Alias, Maybe Hint, Maybe JoinType)
-
 type Field = (FieldName, JsonPath)
 type Cast = Text
 type Alias = Text
@@ -174,12 +147,6 @@ data JsonOperand
  | JIdx { jVal :: Text }
  deriving (Eq)

-- First level FieldNames(e.g get a,b from /table?select=a,b,other(c,d))
-fstFieldNames :: ReadRequest -> [FieldName]
-fstFieldNames (Node (sel, _) _) =
-  fst . (\(f, _, _, _, _) -> f) <$> select sel
-
-
 -- | Boolean logic expression tree e.g. "and(name.eq.N,or(id.eq.1,id.eq.2))" is:
 --
 --            And
@@ -208,13 +175,12 @@ data OpExpr =
  deriving (Eq)

 data Operation
-  = Op Operator SingleVal
+  = Op SimpleOperator SingleVal
  | In ListVal
  | Is TrileanVal
-  | Fts Operator (Maybe Language) SingleVal
+  | Fts FtsOperator (Maybe Language) SingleVal
  deriving (Eq)

-type Operator = Text
 type Language = Text

 -- | Represents a single value in a filter, e.g. id=eq.singleval
@@ -230,3 +196,32 @@ data TrileanVal
  | TriNull
  | TriUnknown
  deriving Eq
+
+data SimpleOperator
+  = OpEqual
+  | OpGreaterThanEqual
+  | OpGreaterThan
+  | OpLessThanEqual
+  | OpLessThan
+  | OpNotEqual
+  | OpLike
+  | OpILike
+  | OpContains
+  | OpContained
+  | OpOverlap
+  | OpStrictlyLeft
+  | OpStrictlyRight
+  | OpNotExtendsRight
+  | OpNotExtendsLeft
+  | OpAdjacent
+  | OpMatch
+  | OpIMatch
+  deriving Eq
+
+-- | Operators for full text search operators
+data FtsOperator
+  = FilterFts
+  | FilterFtsPlain
+  | FilterFtsPhrase
+  | FilterFtsWebsearch
+  deriving Eq
@@ -43,10 +43,9 @@ runAppWithSocket settings app socketFileMode socketFilePath =
 -- | Set signal handlers, only for systems with signals
 installSignalHandlers :: AppState.AppState -> IO ()
 installSignalHandlers appState = do
-  -- Releases the connection pool whenever the program is terminated,
-  -- see https://github.com/PostgREST/postgrest/issues/268
-  install Signals.sigINT $ AppState.releasePool appState
-  install Signals.sigTERM $ AppState.releasePool appState
+  let interrupt = throwTo (AppState.getMainThreadId appState) UserInterrupt
+  install Signals.sigINT interrupt
+  install Signals.sigTERM interrupt

  -- The SIGUSR1 signal updates the internal 'DbStructure' by running
  -- 'connectionWorker' exactly as before.
@@ -30,10 +30,12 @@ prettyVersion =


 -- | Version number used in docs.
+-- Pre-release versions link to the latest docs
 -- Uses only the two first components of the version. Example: 'v1.1'
 docsVersion :: Text
-docsVersion =
-  "v" <> (T.intercalate "." . map show . take 2 $ versionBranch version)
+docsVersion
+  | isPreRelease = "latest"
+  | otherwise    =  "v" <> (T.intercalate "." . map show . take 2 $ versionBranch version)


 -- | Versions with four components (e.g., '1.1.1.1') are treated as pre-releases.
@@ -12,7 +12,6 @@ import qualified Data.ByteString            as BS
 import qualified Data.ByteString.Lazy       as LBS
 import qualified Data.Text.Encoding         as T
 import qualified Hasql.Notifications        as SQL
-import qualified Hasql.Pool                 as SQL
 import qualified Hasql.Transaction.Sessions as SQL

 import Control.Retry    (RetryStatus, capDelay, exponentialBackoff,
@@ -49,7 +48,7 @@ data SCacheStatus
 -- up-to-date schema cache(DbStructure).  This method is meant to be called
 -- multiple times by the same thread, but does nothing if the previous
 -- invocation has not terminated. In all cases this method does not halt the
-- calling thread, the work is preformed in a separate thread.
+-- calling thread, the work is performed in a separate thread.
 --
 -- Background thread that does the following :
 --  1. Tries to connect to pg server and will keep trying until success.
@@ -58,13 +57,14 @@ data SCacheStatus
 --  3. Obtains the dbStructure. If this fails, it goes back to 1.
 connectionWorker :: AppState -> IO ()
 connectionWorker appState = do
-  isWorkerOn <- AppState.getIsWorkerOn appState
+  runExclusively (AppState.getWorkerSem appState) work
  -- Prevents multiple workers to be running at the same time. Could happen on
  -- too many SIGUSR1s.
-  unless isWorkerOn $ do
-    AppState.putIsWorkerOn appState True
-    void $ forkIO work
  where
+    runExclusively mvar action = mask_ $ do
+      success <- tryPutMVar mvar ()
+      when success $ do
+        void $ forkIO $ action `finally` takeMVar mvar
    work = do
      AppConfig{..} <- AppState.getConfig appState
      AppState.logWithZTime appState "Attempting to connect to the database..."
@@ -91,11 +91,11 @@ connectionWorker appState = do
              -- do nothing and proceed if the load was successful
              return ()
            SCOnRetry ->
+              -- retry reloading the schema cache
              work
            SCFatalFail ->
              -- die if our schema cache query has an error
              killThread $ AppState.getMainThreadId appState
-          AppState.putIsWorkerOn appState False

 -- | Check if a connection from the pool allows access to the PostgreSQL
 -- database.  If not, the pool connections are released and a new connection is
@@ -109,16 +109,15 @@ connectionWorker appState = do
 connectionStatus :: AppState -> IO ConnectionStatus
 connectionStatus appState =
  retrying retrySettings shouldRetry $
-    const $ SQL.release pool >> getConnectionStatus
+    const $ AppState.releasePool appState >> getConnectionStatus
  where
-    pool = AppState.getPool appState
    retrySettings = capDelay delayMicroseconds $ exponentialBackoff backoffMicroseconds
    delayMicroseconds = 32000000 -- 32 seconds
    backoffMicroseconds = 1000000 -- 1 second

    getConnectionStatus :: IO ConnectionStatus
    getConnectionStatus = do
-      pgVersion <- SQL.use pool queryPgVersion
+      pgVersion <- AppState.usePool appState queryPgVersion
      case pgVersion of
        Left e -> do
          let err = PgError False e
@@ -152,11 +151,10 @@ connectionStatus appState =
 loadSchemaCache :: AppState -> IO SCacheStatus
 loadSchemaCache appState = do
  AppConfig{..} <- AppState.getConfig appState
-  actualPgVersion <- AppState.getPgVersion appState
  result <-
    let transaction = if configDbPreparedStatements then SQL.transaction else SQL.unpreparedTransaction in
-    SQL.use (AppState.getPool appState) . transaction SQL.ReadCommitted SQL.Read $
-      queryDbStructure (toList configDbSchemas) configDbExtraSearchPath actualPgVersion configDbPreparedStatements
+    AppState.usePool appState . transaction SQL.ReadCommitted SQL.Read $
+      queryDbStructure (toList configDbSchemas) configDbExtraSearchPath configDbPreparedStatements
  case result of
    Left e -> do
      let
@@ -169,12 +167,13 @@ loadSchemaCache appState = do
          AppState.logWithZTime appState hint
          return SCFatalFail
        Nothing -> do
+          AppState.putDbStructure appState Nothing
          AppState.logWithZTime appState "An error ocurred when loading the schema cache"
          putErr
          return SCOnRetry

    Right dbStructure -> do
-      AppState.putDbStructure appState dbStructure
+      AppState.putDbStructure appState (Just dbStructure)
      when (isJust configDbRootSpec) .
        AppState.putJsonDbS appState . LBS.toStrict $ JSON.encode dbStructure
      AppState.logWithZTime appState "Schema cache loaded"
@@ -200,6 +199,7 @@ listener appState = do
    case dbOrError of
      Right db -> do
        AppState.logWithZTime appState $ "Listening for notifications on the " <> dbChannel <> " channel"
+        AppState.putIsListenerOn appState True
        SQL.listen db $ SQL.toPgIdentifier dbChannel
        SQL.waitForNotifications handleNotification db
      _ ->
@@ -208,6 +208,7 @@ listener appState = do
    handleFinally dbChannel _ = do
      -- if the thread dies, we try to recover
      AppState.logWithZTime appState $ "Retrying listening for notifications on the " <> dbChannel <> " channel.."
+      AppState.putIsListenerOn appState False
      -- assume the pool connection was also lost, call the connection worker
      connectionWorker appState
      -- retry the listener
@@ -231,7 +232,7 @@ reReadConfig startingUp appState = do
  AppConfig{..} <- AppState.getConfig appState
  dbSettings <-
    if configDbConfig then do
-      qDbSettings <- queryDbSettings (AppState.getPool appState) configDbPreparedStatements
+      qDbSettings <- AppState.usePool appState $ queryDbSettings configDbPreparedStatements
      case qDbSettings of
        Left e -> do
          let
@@ -245,7 +246,7 @@ reReadConfig startingUp appState = do
              AppState.logWithZTime appState hint
              killThread (AppState.getMainThreadId appState)
            Nothing -> do
-              AppState.logWithZTime appState $ show e
+              putErr
          pure []
        Right x -> pure x
    else
@@ -255,10 +256,10 @@ reReadConfig startingUp appState = do
      if startingUp then
        panic err -- die on invalid config if the program is starting up
      else
-        AppState.logWithZTime appState $ "Failed re-loading config: " <> err
+        AppState.logWithZTime appState $ "Failed reloading config: " <> err
    Right newConf -> do
      AppState.putConfig appState newConf
      if startingUp then
        pass
      else
-        AppState.logWithZTime appState "Config re-loaded"
+        AppState.logWithZTime appState "Config reloaded"
@@ -1,4 +1,4 @@
-resolver: lts-18.14 # 2021-10-24, GHC 8.10.7
+resolver: lts-19.14 # 2022-07-01, GHC 9.0.2

 nix:
  packages:
@@ -10,6 +10,12 @@ nix:
  pure: false

 extra-deps:
-  - hasql-dynamic-statements-0.3.1@sha256:c3a2c89c4a8b3711368dbd33f0ccfe46a493faa7efc2c85d3e354c56a01dfc48,2673
-  - hasql-implicits-0.1.0.2@sha256:5d54e09cb779a209681b139fb3cc726bae75134557932156340cc0a56dd834a8,1361
-  - ptr-0.16.8.1@sha256:525219ec5f5da5c699725f7efcef91b00a7d44120fc019878b85c09440bf51d6,2686
+  - HTTP-4000.3.16@sha256:6042643c15a0b43e522a6693f1e322f05000d519543a84149cb80aeffee34f71,5947
+  - configurator-pg-0.2.6@sha256:cd9b06a458428e493a4d6def725af7ab1ab0fef678fbd871f9586fc7f9aa70be,2849
+  - hasql-dynamic-statements-0.3.1.1@sha256:2cfe6e75990e690f595a87cbe553f2e90fcd738610f6c66749c81cc4396b2cc4,2675
+  - hasql-implicits-0.1.0.4@sha256:0848d3cbc9d94e1e539948fa0be4d0326b26335034161bf8076785293444ca6f,1361
+  - hasql-pool-0.5.2.2@sha256:b56d4dea112d97a2ef4b2749508c0ca646828cb2d77b827e8dc433d249bb2062,2438
+  - lens-aeson-1.1.3@sha256:52c8eaecd2d1c2a969c0762277c4a8ee72c339a686727d5785932e72ef9c3050,1764
+  - optparse-applicative-0.16.1.0@sha256:418c22ed6a19124d457d96bc66bd22c93ac22fad0c7100fe4972bbb4ac989731,4982
+  - protolude-0.3.2@sha256:2a38b3dad40d238ab644e234b692c8911423f9d3ed0e36b62287c4a698d92cd1,2240
+  - ptr-0.16.8.2@sha256:708ebb95117f2872d2c5a554eb6804cf1126e86abe793b2673f913f14e5eb1ac,3959
@@ -5,29 +5,71 @@

 packages:
 - completed:
-    hackage: hasql-dynamic-statements-0.3.1@sha256:c3a2c89c4a8b3711368dbd33f0ccfe46a493faa7efc2c85d3e354c56a01dfc48,2673
+    hackage: HTTP-4000.3.16@sha256:6042643c15a0b43e522a6693f1e322f05000d519543a84149cb80aeffee34f71,5947
    pantry-tree:
-      size: 641
-      sha256: b1b9a6a26ec765e5fe29f9a670a5c9ec7067ea00dee8491f0819284ff0201b6f
+      size: 1428
+      sha256: b73a7f6d21cf20bbf819e19039409c9010efb5000d2b72cdd8fd67a9027c14e8
  original:
-    hackage: hasql-dynamic-statements-0.3.1@sha256:c3a2c89c4a8b3711368dbd33f0ccfe46a493faa7efc2c85d3e354c56a01dfc48,2673
+    hackage: HTTP-4000.3.16@sha256:6042643c15a0b43e522a6693f1e322f05000d519543a84149cb80aeffee34f71,5947
 - completed:
-    hackage: hasql-implicits-0.1.0.2@sha256:5d54e09cb779a209681b139fb3cc726bae75134557932156340cc0a56dd834a8,1361
+    hackage: configurator-pg-0.2.6@sha256:cd9b06a458428e493a4d6def725af7ab1ab0fef678fbd871f9586fc7f9aa70be,2849
    pantry-tree:
-      size: 310
-      sha256: 2f00d1467d0e226b966c2cd7bac433c8948e2f7bbdf8a44936029f66fc20b5f3
+      size: 2463
+      sha256: 97efe7a22afc93033bda5adcffdabc0f1c30dc32b2c3ba02114ce7cd74c942fd
  original:
-    hackage: hasql-implicits-0.1.0.2@sha256:5d54e09cb779a209681b139fb3cc726bae75134557932156340cc0a56dd834a8,1361
+    hackage: configurator-pg-0.2.6@sha256:cd9b06a458428e493a4d6def725af7ab1ab0fef678fbd871f9586fc7f9aa70be,2849
 - completed:
-    hackage: ptr-0.16.8.1@sha256:525219ec5f5da5c699725f7efcef91b00a7d44120fc019878b85c09440bf51d6,2686
+    hackage: hasql-dynamic-statements-0.3.1.1@sha256:2cfe6e75990e690f595a87cbe553f2e90fcd738610f6c66749c81cc4396b2cc4,2675
    pantry-tree:
-      size: 1089
-      sha256: d2b8440a738719ef8430ec38fe33b129e3940e4ccf2c016a727a1110a43656bb
+      size: 595
+      sha256: b84ae10a5c776f88f546df73bc957a35e61056400b7e805dad0b254612907e97
  original:
-    hackage: ptr-0.16.8.1@sha256:525219ec5f5da5c699725f7efcef91b00a7d44120fc019878b85c09440bf51d6,2686
+    hackage: hasql-dynamic-statements-0.3.1.1@sha256:2cfe6e75990e690f595a87cbe553f2e90fcd738610f6c66749c81cc4396b2cc4,2675
+- completed:
+    hackage: hasql-implicits-0.1.0.4@sha256:0848d3cbc9d94e1e539948fa0be4d0326b26335034161bf8076785293444ca6f,1361
+    pantry-tree:
+      size: 264
+      sha256: d49af8f8749ab7039fa668af4b78f997f7fa2928b4aded6798f573a3d08e76a0
+  original:
+    hackage: hasql-implicits-0.1.0.4@sha256:0848d3cbc9d94e1e539948fa0be4d0326b26335034161bf8076785293444ca6f,1361
+- completed:
+    hackage: hasql-pool-0.5.2.2@sha256:b56d4dea112d97a2ef4b2749508c0ca646828cb2d77b827e8dc433d249bb2062,2438
+    pantry-tree:
+      size: 412
+      sha256: 2741a33f947d28b4076c798c20c1f646beecd21f5eaf522c8256cbeb34d4d6d0
+  original:
+    hackage: hasql-pool-0.5.2.2@sha256:b56d4dea112d97a2ef4b2749508c0ca646828cb2d77b827e8dc433d249bb2062,2438
+- completed:
+    hackage: lens-aeson-1.1.3@sha256:52c8eaecd2d1c2a969c0762277c4a8ee72c339a686727d5785932e72ef9c3050,1764
+    pantry-tree:
+      size: 541
+      sha256: b31392b78f2a03111c805f4400007778eb93b49f998ab41dfbebaaf9b5526bad
+  original:
+    hackage: lens-aeson-1.1.3@sha256:52c8eaecd2d1c2a969c0762277c4a8ee72c339a686727d5785932e72ef9c3050,1764
+- completed:
+    hackage: optparse-applicative-0.16.1.0@sha256:418c22ed6a19124d457d96bc66bd22c93ac22fad0c7100fe4972bbb4ac989731,4982
+    pantry-tree:
+      size: 2979
+      sha256: dd092d843091c08691485d68a1908517079b1bc6f3d73928f37635a19dc27fc1
+  original:
+    hackage: optparse-applicative-0.16.1.0@sha256:418c22ed6a19124d457d96bc66bd22c93ac22fad0c7100fe4972bbb4ac989731,4982
+- completed:
+    hackage: protolude-0.3.2@sha256:2a38b3dad40d238ab644e234b692c8911423f9d3ed0e36b62287c4a698d92cd1,2240
+    pantry-tree:
+      size: 1594
+      sha256: a36d2912ac552d950ba4476de7d950b56b82dd28e48b9f4d0efee938f10bc525
+  original:
+    hackage: protolude-0.3.2@sha256:2a38b3dad40d238ab644e234b692c8911423f9d3ed0e36b62287c4a698d92cd1,2240
+- completed:
+    hackage: ptr-0.16.8.2@sha256:708ebb95117f2872d2c5a554eb6804cf1126e86abe793b2673f913f14e5eb1ac,3959
+    pantry-tree:
+      size: 1303
+      sha256: 557c438345de19f82bf01d676100da2a191ef06f624e7a4b90b09ac17cbb52a5
+  original:
+    hackage: ptr-0.16.8.2@sha256:708ebb95117f2872d2c5a554eb6804cf1126e86abe793b2673f913f14e5eb1ac,3959
 snapshots:
 - completed:
-    size: 586069
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/18/14.yaml
-    sha256: 87842ecbaa8ca9cee59a7e6be52369dbed82ed075cb4e0d152614a627e8fd488
-  original: lts-18.14
+    size: 618951
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/19/14.yaml
+    sha256: 4c31d4ef975b0211078862566aedf3b82b6cea569fc2cde4c72a51e5a8d236ce
+  original: lts-19.14
@@ -1,74 +0,0 @@
-module Feature.CorsSpec where
-
-- {{{ Imports
-import qualified Data.ByteString.Lazy as BL
-
-import Network.Wai      (Application)
-import Network.Wai.Test (SResponse (simpleBody, simpleHeaders))
-
-import Network.HTTP.Types
-import Test.Hspec
-import Test.Hspec.Wai
-
-import Protolude
-import SpecHelper
-- }}}
-
-spec :: SpecWith ((), Application)
-spec =
-  describe "CORS" $ do
-    let preflightHeaders = [
-          ("Accept", "*/*"),
-          ("Origin", "http://example.com"),
-          ("Access-Control-Request-Method", "POST"),
-          ("Access-Control-Request-Headers", "Foo,Bar") ]
-    let normalCors = [
-          ("Host", "localhost:3000"),
-          ("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:32.0) Gecko/20100101 Firefox/32.0"),
-          ("Origin", "http://localhost:8000"),
-          ("Accept", "text/csv, */*; q=0.01"),
-          ("Accept-Language", "en-US,en;q=0.5"),
-          ("Accept-Encoding", "gzip, deflate"),
-          ("Referer", "http://localhost:8000/"),
-          ("Connection", "keep-alive") ]
-
-    describe "preflight request" $ do
-      it "replies naively and permissively to preflight request" $ do
-        r <- request methodOptions "/items" preflightHeaders ""
-        liftIO $ do
-          let respHeaders = simpleHeaders r
-          respHeaders `shouldSatisfy` matchHeader
-            "Access-Control-Allow-Origin"
-            "http://example.com"
-          respHeaders `shouldSatisfy` matchHeader
-            "Access-Control-Allow-Credentials"
-            "true"
-          respHeaders `shouldSatisfy` matchHeader
-            "Access-Control-Allow-Methods"
-            "GET, POST, PATCH, PUT, DELETE, OPTIONS, HEAD"
-          respHeaders `shouldSatisfy` matchHeader
-            "Access-Control-Allow-Headers"
-            "Authentication, Foo, Bar, Accept, Accept-Language, Content-Language"
-          respHeaders `shouldSatisfy` matchHeader
-            "Access-Control-Max-Age"
-            "86400"
-
-      it "suppresses body in response" $ do
-        r <- request methodOptions "/" preflightHeaders ""
-        liftIO $ simpleBody r `shouldBe` ""
-
-    describe "regular request" $
-      it "exposes necesssary response headers" $ do
-        r <- request methodGet "/items" [("Origin", "http://example.com")] ""
-        liftIO $ simpleHeaders r `shouldSatisfy` matchHeader
-          "Access-Control-Expose-Headers"
-          "Content-Encoding, Content-Location, Content-Range, Content-Type, \
-            \Date, Location, Server, Transfer-Encoding, Range-Unit"
-
-    describe "postflight request" $
-      it "allows INFO body through even with CORS request headers present" $ do
-        r <- request methodOptions "/items" normalCors ""
-        liftIO $ do
-          simpleHeaders r `shouldSatisfy` matchHeader
-            "Access-Control-Allow-Origin" "\\*"
-          simpleBody r `shouldSatisfy` BL.null
@@ -1,92 +0,0 @@
-module Feature.DeleteSpec where
-
-import Network.Wai (Application)
-
-import Network.HTTP.Types
-import Test.Hspec
-import Test.Hspec.Wai
-import Test.Hspec.Wai.JSON
-
-import Protolude hiding (get)
-
-spec :: SpecWith ((), Application)
-spec =
-  describe "Deleting" $ do
-    context "existing record" $ do
-      it "succeeds with 204 and deletion count" $
-        request methodDelete "/items?id=eq.1" [] ""
-          `shouldRespondWith` ""
-          { matchStatus  = 204
-          , matchHeaders = ["Content-Range" <:> "*/*"]
-          }
-
-      it "returns the deleted item and count if requested" $
-        request methodDelete "/items?id=eq.2" [("Prefer", "return=representation"), ("Prefer", "count=exact")] ""
-          `shouldRespondWith` [json|[{"id":2}]|]
-          { matchStatus  = 200
-          , matchHeaders = ["Content-Range" <:> "*/1"]
-          }
-
-      it "ignores ?select= when return not set or return=minimal" $ do
-        request methodDelete "/items?id=eq.3&select=id" [] ""
-          `shouldRespondWith` ""
-          { matchStatus  = 204
-          , matchHeaders = ["Content-Range" <:> "*/*"]
-          }
-        request methodDelete "/items?id=eq.3&select=id" [("Prefer", "return=minimal")] ""
-          `shouldRespondWith` ""
-          { matchStatus  = 204
-          , matchHeaders = ["Content-Range" <:> "*/*"]
-          }
-
-      it "returns the deleted item and shapes the response" $
-        request methodDelete "/complex_items?id=eq.2&select=id,name" [("Prefer", "return=representation")] ""
-          `shouldRespondWith` [json|[{"id":2,"name":"Two"}]|]
-          { matchStatus  = 200
-          , matchHeaders = ["Content-Range" <:> "*/*"]
-          }
-
-      it "can rename and cast the selected columns" $
-        request methodDelete "/complex_items?id=eq.3&select=ciId:id::text,ciName:name" [("Prefer", "return=representation")] ""
-          `shouldRespondWith` [json|[{"ciId":"3","ciName":"Three"}]|]
-
-      it "can embed (parent) entities" $
-        request methodDelete "/tasks?id=eq.8&select=id,name,project:projects(id)" [("Prefer", "return=representation")] ""
-          `shouldRespondWith` [json|[{"id":8,"name":"Code OSX","project":{"id":4}}]|]
-          { matchStatus  = 200
-          , matchHeaders = ["Content-Range" <:> "*/*"]
-          }
-
-    context "known route, no records matched" $
-      it "includes [] body if return=rep" $
-        request methodDelete "/items?id=eq.101"
-          [("Prefer", "return=representation")] ""
-          `shouldRespondWith` "[]"
-          { matchStatus  = 200
-          , matchHeaders = ["Content-Range" <:> "*/*"]
-          }
-
-    context "totally unknown route" $
-      it "fails with 404" $
-        request methodDelete "/foozle?id=eq.101" [] "" `shouldRespondWith` 404
-
-    context "table with limited privileges" $ do
-      it "fails deleting the row when return=representation and selecting all the columns" $
-        request methodDelete "/app_users?id=eq.1" [("Prefer", "return=representation")] mempty
-            `shouldRespondWith` 401
-
-      it "succeeds deleting the row when return=representation and selecting only the privileged columns" $
-        request methodDelete "/app_users?id=eq.1&select=id,email" [("Prefer", "return=representation")]
-          [json| { "password": "passxyz" } |]
-            `shouldRespondWith` [json|[ { "id": 1, "email": "test@123.com" } ]|]
-            { matchStatus  = 200
-            , matchHeaders = ["Content-Range" <:> "*/*"]
-            }
-
-      it "suceeds deleting the row with no explicit select when using return=minimal" $
-        request methodDelete "/app_users?id=eq.2" [("Prefer", "return=minimal")] mempty
-            `shouldRespondWith` 204
-
-      it "suceeds deleting the row with no explicit select by default" $
-        request methodDelete "/app_users?id=eq.3" [] mempty
-            `shouldRespondWith` 204
@@ -1,31 +0,0 @@
-module Feature.NoJwtSpec where
-
-- {{{ Imports
-
-import Network.Wai (Application)
-
-import Network.HTTP.Types
-import Test.Hspec
-import Test.Hspec.Wai
-import Test.Hspec.Wai.JSON
-
-import Protolude
-import SpecHelper
-- }}}
-
-spec :: SpecWith ((), Application)
-spec = describe "server started without JWT secret" $ do
-
-  -- this test will stop working 9999999999s after the UNIX EPOCH
-  it "responds with error on attempted auth" $ do
-    let auth = authHeaderJWT "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjk5OTk5OTk5OTksInJvbGUiOiJwb3N0Z3Jlc3RfdGVzdF9hdXRob3IiLCJpZCI6Impkb2UifQ.Dpss-QoLYjec5OTsOaAc3FNVsSjA89wACoV-0ra3ClA"
-    request methodGet "/authors_only" [auth] ""
-      `shouldRespondWith`
-      [json|{"message":"Server lacks JWT secret"}|]
-      { matchStatus  = 500
-      , matchHeaders = [ matchContentTypeJson ]
-      }
-
-  it "behaves normally when user does not attempt auth" $
-    request methodGet "/items" [] ""
-      `shouldRespondWith` 200
@@ -1,17 +0,0 @@
-module Feature.NonexistentSchemaSpec where
-
-import Network.Wai (Application)
-
-import Test.Hspec
-import Test.Hspec.Wai
-
-import Protolude hiding (get)
-
-spec :: SpecWith ((), Application)
-spec =
-  describe "Non existent api schema" $ do
-    it "succeeds when requesting root path" $
-      get "/" `shouldRespondWith` 200
-
-    it "gives 404 when requesting a nonexistent table in this nonexistent schema" $
-      get "/nonexistent_table" `shouldRespondWith` 404
@@ -1,69 +0,0 @@
-module Feature.QueryLimitedSpec where
-
-import Network.Wai (Application)
-
-import Network.HTTP.Types
-import Test.Hspec
-import Test.Hspec.Wai
-import Test.Hspec.Wai.JSON
-
-import Protolude  hiding (get)
-import SpecHelper
-
-spec :: SpecWith ((), Application)
-spec =
-  describe "Requesting many items with server limits(max-rows) enabled" $ do
-    it "restricts results" $
-      get "/items?order=id"
-        `shouldRespondWith`
-          [json| [{"id":1},{"id":2}] |]
-          { matchHeaders = ["Content-Range" <:> "0-1/*"] }
-
-    it "respects additional client limiting" $ do
-      request methodGet  "/items"
-          (rangeHdrs $ ByteRangeFromTo 0 0)
-          ""
-        `shouldRespondWith`
-          [json| [{"id":1}] |]
-          { matchHeaders = ["Content-Range" <:> "0-0/*"] }
-
-    it "works on all levels" $
-      get "/users?select=id,tasks(id)&order=id.asc&tasks.order=id.asc"
-        `shouldRespondWith`
-          [json|[{"id":1,"tasks":[{"id":1},{"id":2}]},{"id":2,"tasks":[{"id":5},{"id":6}]}]|]
-          { matchHeaders = ["Content-Range" <:> "0-1/*"] }
-
-    it "succeeds in getting parent embeds despite the limit, see #647" $
-      get "/tasks?select=id,project:projects(id)&id=gt.5"
-        `shouldRespondWith`
-          [json|[{"id":6,"project":{"id":3}},{"id":7,"project":{"id":4}}]|]
-          { matchHeaders = ["Content-Range" <:> "0-1/*"] }
-
-    it "can offset the parent embed, being consistent with the other embed types" $
-      get "/tasks?select=id,project:projects(id)&id=gt.5&project.offset=1"
-        `shouldRespondWith`
-          [json|[{"id":6,"project":null}, {"id":7,"project":null}]|]
-          { matchHeaders = ["Content-Range" <:> "0-1/*"] }
-
-    context "count=estimated" $ do
-      it "uses the query planner guess when query rows > maxRows" $
-        request methodHead "/getallprojects_view" [("Prefer", "count=estimated")] ""
-          `shouldRespondWith`
-            ""
-            { matchStatus  = 206
-            , matchHeaders = ["Content-Range" <:> "0-1/2019"]
-            }
-
-      it "gives exact count when query rows <= maxRows" $
-        request methodHead "/getallprojects_view?id=lt.3" [("Prefer", "count=estimated")] ""
-          `shouldRespondWith`
-            ""
-            { matchHeaders = ["Content-Range" <:> "0-1/2"] }
-
-      it "only uses the query planner guess if it's indeed greater than the exact count" $
-        request methodHead "/get_projects_above_view" [("Prefer", "count=estimated")] ""
-          `shouldRespondWith`
-            ""
-            { matchStatus  = 206
-            , matchHeaders = ["Content-Range" <:> "0-1/3"]
-            }
@@ -1,236 +0,0 @@
-module Main where
-
-import qualified Data.Aeson                 as JSON
-import qualified Hasql.Pool                 as P
-import qualified Hasql.Transaction.Sessions as HT
-
-import Data.Function      (id)
-import Data.List.NonEmpty (toList)
-
-import Test.Hspec
-
-import PostgREST.App             (postgrest)
-import PostgREST.Config          (AppConfig (..), LogLevel (..))
-import PostgREST.Config.Database (queryPgVersion)
-import PostgREST.DbStructure     (queryDbStructure)
-import Protolude                 hiding (toList, toS)
-import Protolude.Conv            (toS)
-import SpecHelper
-
-import qualified PostgREST.AppState as AppState
-
-import qualified Feature.AndOrParamsSpec
-import qualified Feature.AsymmetricJwtSpec
-import qualified Feature.AudienceJwtSecretSpec
-import qualified Feature.AuthSpec
-import qualified Feature.BinaryJwtSecretSpec
-import qualified Feature.ConcurrentSpec
-import qualified Feature.CorsSpec
-import qualified Feature.DeleteSpec
-import qualified Feature.DisabledOpenApiSpec
-import qualified Feature.EmbedDisambiguationSpec
-import qualified Feature.EmbedInnerJoinSpec
-import qualified Feature.ExtraSearchPathSpec
-import qualified Feature.HtmlRawOutputSpec
-import qualified Feature.IgnorePrivOpenApiSpec
-import qualified Feature.InsertSpec
-import qualified Feature.JsonOperatorSpec
-import qualified Feature.LegacyGucsSpec
-import qualified Feature.MultipleSchemaSpec
-import qualified Feature.NoJwtSpec
-import qualified Feature.NonexistentSchemaSpec
-import qualified Feature.OpenApiSpec
-import qualified Feature.OptionsSpec
-import qualified Feature.ProxySpec
-import qualified Feature.QueryLimitedSpec
-import qualified Feature.QuerySpec
-import qualified Feature.RangeSpec
-import qualified Feature.RawOutputTypesSpec
-import qualified Feature.RollbackSpec
-import qualified Feature.RootSpec
-import qualified Feature.RpcPreRequestGucsSpec
-import qualified Feature.RpcSpec
-import qualified Feature.SingularSpec
-import qualified Feature.UnicodeSpec
-import qualified Feature.UpdateSpec
-import qualified Feature.UpsertSpec
-
-
-main :: IO ()
-main = do
-  testDbConn <- getEnvVarWithDefault "PGRST_DB_URI" "postgres://postgrest_test@localhost/postgrest_test"
-
-  pool <- P.acquire (3, 10, toS testDbConn)
-
-  actualPgVersion <- either (panic.show) id <$> P.use pool queryPgVersion
-
-  baseDbStructure <-
-    loadDbStructure pool
-      (configDbSchemas $ testCfg testDbConn)
-      (configDbExtraSearchPath $ testCfg testDbConn)
-      actualPgVersion
-
-  let
-    -- For tests that run with the same refDbStructure
-    app cfg = do
-      let config = cfg testDbConn
-      appState <- AppState.initWithPool pool config
-      AppState.putPgVersion appState actualPgVersion
-      AppState.putDbStructure appState baseDbStructure
-      when (isJust $ configDbRootSpec config) $
-        AppState.putJsonDbS appState $ toS $ JSON.encode baseDbStructure
-      return ((), postgrest LogCrit appState $ pure ())
-
-    -- For tests that run with a different DbStructure(depends on configSchemas)
-    appDbs cfg = do
-      let config = cfg testDbConn
-      customDbStructure <-
-        loadDbStructure pool
-          (configDbSchemas config)
-          (configDbExtraSearchPath config)
-          actualPgVersion
-      appState <- AppState.initWithPool pool config
-      AppState.putPgVersion appState actualPgVersion
-      AppState.putDbStructure appState customDbStructure
-      when (isJust $ configDbRootSpec config) $
-        AppState.putJsonDbS appState $ toS $ JSON.encode baseDbStructure
-      return ((), postgrest LogCrit appState $ pure ())
-
-  let withApp              = app testCfg
-      maxRowsApp           = app testMaxRowsCfg
-      disabledOpenApi      = app testDisabledOpenApiCfg
-      proxyApp             = app testProxyCfg
-      noJwtApp             = app testCfgNoJWT
-      binaryJwtApp         = app testCfgBinaryJWT
-      audJwtApp            = app testCfgAudienceJWT
-      asymJwkApp           = app testCfgAsymJWK
-      asymJwkSetApp        = app testCfgAsymJWKSet
-      rootSpecApp          = app testCfgRootSpec
-      htmlRawOutputApp     = app testCfgHtmlRawOutput
-      responseHeadersApp   = app testCfgResponseHeaders
-      disallowRollbackApp  = app testCfgDisallowRollback
-      forceRollbackApp     = app testCfgForceRollback
-      testCfgLegacyGucsApp = app testCfgLegacyGucs
-
-      extraSearchPathApp   = appDbs testCfgExtraSearchPath
-      unicodeApp           = appDbs testUnicodeCfg
-      nonexistentSchemaApp = appDbs testNonexistentSchemaCfg
-      multipleSchemaApp    = appDbs testMultipleSchemaCfg
-      ignorePrivOpenApi    = appDbs testIgnorePrivOpenApiCfg
-
-  let analyze :: IO ()
-      analyze = do
-        analyzeTable testDbConn "items"
-        analyzeTable testDbConn "child_entities"
-
-      specs = uncurry describe <$> [
-          ("Feature.AndOrParamsSpec"         , Feature.AndOrParamsSpec.spec actualPgVersion)
-        , ("Feature.AuthSpec"                , Feature.AuthSpec.spec actualPgVersion)
-        , ("Feature.ConcurrentSpec"          , Feature.ConcurrentSpec.spec)
-        , ("Feature.CorsSpec"                , Feature.CorsSpec.spec)
-        , ("Feature.DeleteSpec"              , Feature.DeleteSpec.spec)
-        , ("Feature.EmbedDisambiguationSpec" , Feature.EmbedDisambiguationSpec.spec)
-        , ("Feature.EmbedInnerJoinSpec"      , Feature.EmbedInnerJoinSpec.spec)
-        , ("Feature.InsertSpec"              , Feature.InsertSpec.spec actualPgVersion)
-        , ("Feature.JsonOperatorSpec"        , Feature.JsonOperatorSpec.spec actualPgVersion)
-        , ("Feature.OpenApiSpec"             , Feature.OpenApiSpec.spec actualPgVersion)
-        , ("Feature.OptionsSpec"             , Feature.OptionsSpec.spec actualPgVersion)
-        , ("Feature.QuerySpec"               , Feature.QuerySpec.spec actualPgVersion)
-        , ("Feature.RawOutputTypesSpec"      , Feature.RawOutputTypesSpec.spec)
-        , ("Feature.RpcSpec"                 , Feature.RpcSpec.spec actualPgVersion)
-        , ("Feature.SingularSpec"            , Feature.SingularSpec.spec)
-        , ("Feature.UpdateSpec"              , Feature.UpdateSpec.spec)
-        , ("Feature.UpsertSpec"              , Feature.UpsertSpec.spec actualPgVersion)
-        ]
-
-  hspec $ do
-    mapM_ (parallel . before withApp) specs
-
-    -- we analyze to get accurate results from EXPLAIN
-    parallel $ beforeAll_ analyze . before withApp $
-      describe "Feature.RangeSpec" Feature.RangeSpec.spec
-
-    -- this test runs with a raw-output-media-types set to text/html
-    parallel $ before htmlRawOutputApp $
-      describe "Feature.HtmlRawOutputSpec" Feature.HtmlRawOutputSpec.spec
-
-    -- this test runs with a different server flag
-    parallel $ before maxRowsApp $
-      describe "Feature.QueryLimitedSpec" Feature.QueryLimitedSpec.spec
-
-    -- this test runs with a different schema
-    parallel $ before unicodeApp $
-      describe "Feature.UnicodeSpec" Feature.UnicodeSpec.spec
-
-    -- this test runs with openapi-mode set to disabled
-    parallel $ before disabledOpenApi $
-      describe "Feature.DisabledOpenApiSpec" Feature.DisabledOpenApiSpec.spec
-
-    -- this test runs with openapi-mode set to ignore-acl
-    parallel $ before ignorePrivOpenApi $
-      describe "Feature.IgnorePrivOpenApiSpec" Feature.IgnorePrivOpenApiSpec.spec
-
-    -- this test runs with a proxy
-    parallel $ before proxyApp $
-      describe "Feature.ProxySpec" Feature.ProxySpec.spec
-
-    -- this test runs without a JWT secret
-    parallel $ before noJwtApp $
-      describe "Feature.NoJwtSpec" Feature.NoJwtSpec.spec
-
-    -- this test runs with a binary JWT secret
-    parallel $ before binaryJwtApp $
-      describe "Feature.BinaryJwtSecretSpec" Feature.BinaryJwtSecretSpec.spec
-
-    -- this test runs with a binary JWT secret and an audience claim
-    parallel $ before audJwtApp $
-      describe "Feature.AudienceJwtSecretSpec" Feature.AudienceJwtSecretSpec.spec
-
-    -- this test runs with asymmetric JWK
-    parallel $ before asymJwkApp $
-      describe "Feature.AsymmetricJwtSpec" Feature.AsymmetricJwtSpec.spec
-
-    -- this test runs with asymmetric JWKSet
-    parallel $ before asymJwkSetApp $
-      describe "Feature.AsymmetricJwtSpec" Feature.AsymmetricJwtSpec.spec
-
-    -- this test runs with a nonexistent db-schema
-    parallel $ before nonexistentSchemaApp $
-      describe "Feature.NonexistentSchemaSpec" Feature.NonexistentSchemaSpec.spec
-
-    -- this test runs with an extra search path
-    parallel $ before extraSearchPathApp $
-      describe "Feature.ExtraSearchPathSpec" Feature.ExtraSearchPathSpec.spec
-
-    -- this test runs with a root spec function override
-    parallel $ before rootSpecApp $
-      describe "Feature.RootSpec" Feature.RootSpec.spec
-    parallel $ before responseHeadersApp $
-      describe "Feature.RpcPreRequestGucsSpec" Feature.RpcPreRequestGucsSpec.spec
-
-    -- this test runs with multiple schemas
-    parallel $ before multipleSchemaApp $
-      describe "Feature.MultipleSchemaSpec" Feature.MultipleSchemaSpec.spec
-
-    -- this test runs with db-uses-legacy-gucs = false
-    parallel $ before testCfgLegacyGucsApp $
-      describe "Feature.LegacyGucsSpec" Feature.LegacyGucsSpec.spec
-
-    -- Note: the rollback tests can not run in parallel, because they test persistance and
-    -- this results in race conditions
-
-    -- this test runs with tx-rollback-all = true and tx-allow-override = true
-    before withApp $
-      describe"Feature.RollbackAllowedSpec" Feature.RollbackSpec.allowed
-
-    -- this test runs with tx-rollback-all = false and tx-allow-override = false
-    before disallowRollbackApp $
-      describe "Feature.RollbackDisallowedSpec" Feature.RollbackSpec.disallowed
-
-    -- this test runs with tx-rollback-all = true and tx-allow-override = false
-    before forceRollbackApp $
-      describe "Feature.RollbackForcedSpec" Feature.RollbackSpec.forced
-
-  where
-    loadDbStructure pool schemas extraSearchPath actualPgVersion =
-      either (panic.show) id <$> P.use pool (HT.transaction HT.ReadCommitted HT.Read $ queryDbStructure (toList schemas) extraSearchPath actualPgVersion True)
@@ -8,10 +8,11 @@ import Protolude
 main :: IO ()
 main =
  doctest
-    [ "--verbose"
-    , "-XOverloadedStrings"
+    [ "-XOverloadedStrings"
    , "-XNoImplicitPrelude"
    , "-XStandaloneDeriving"
    , "-isrc"
+    , "src/PostgREST/Query/SqlFragment.hs"
    , "src/PostgREST/Request/Preferences.hs"
+    , "src/PostgREST/Request/QueryParams.hs"
    ]
@@ -1,62 +0,0 @@
-\set AUTHENTICATOR current_user
-DROP ROLE IF EXISTS postgrest_test_anonymous, postgrest_test_default_role, postgrest_test_author;
-CREATE ROLE postgrest_test_anonymous;
-CREATE ROLE postgrest_test_default_role;
-CREATE ROLE postgrest_test_author;
-
-GRANT postgrest_test_anonymous, postgrest_test_default_role, postgrest_test_author TO :USER;
-
-- reloadable config options for io tests
-ALTER ROLE postgrest_test_authenticator SET pgrst.jwt_aud = 'https://example.org';
-ALTER ROLE postgrest_test_authenticator SET pgrst.openapi_server_proxy_uri = 'https://example.org/api';
-ALTER ROLE postgrest_test_authenticator SET pgrst.raw_media_types = 'application/vnd.pgrst.db-config';
-ALTER ROLE postgrest_test_authenticator SET pgrst.jwt_secret = 'REALLYREALLYREALLYREALLYVERYSAFE';
-ALTER ROLE postgrest_test_authenticator SET pgrst.jwt_secret_is_base64 = 'true';
-ALTER ROLE postgrest_test_authenticator SET pgrst.jwt_role_claim_key = '."a"."role"';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_tx_end = 'commit-allow-override';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_schemas = 'test, tenant1, tenant2';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_root_spec = 'root';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_prepared_statements = 'false';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_pre_request = 'test.custom_headers';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_max_rows = '1000';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_extra_search_path = 'public, extensions';
-
-- override with database specific setting
-ALTER ROLE postgrest_test_authenticator IN DATABASE :DBNAME SET pgrst.jwt_secret = 'OVERRIDEREALLYREALLYREALLYREALLYVERYSAFE';
-ALTER ROLE postgrest_test_authenticator IN DATABASE :DBNAME SET pgrst.db_extra_search_path = 'public, extensions, private';
-
-- other database settings that should be ignored
-DROP DATABASE IF EXISTS other;
-CREATE DATABASE other;
-ALTER ROLE postgrest_test_authenticator IN DATABASE other SET pgrst.db_max_rows = '1111';
-
-- non-reloadable configs for io tests
-ALTER ROLE postgrest_test_authenticator SET pgrst.server_host = 'ignored';
-ALTER ROLE postgrest_test_authenticator SET pgrst.server_port = 'ignored';
-ALTER ROLE postgrest_test_authenticator SET pgrst.server_unix_socket = 'ignored';
-ALTER ROLE postgrest_test_authenticator SET pgrst.server_unix_socket_mode = 'ignored';
-ALTER ROLE postgrest_test_authenticator SET pgrst.log_level = 'ignored';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_anon_role = 'ignored';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_uri = 'postgresql://ignored';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_channel_enabled = 'ignored';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_channel = 'ignored';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_pool = 'ignored';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_pool_timeout = 'ignored';
-ALTER ROLE postgrest_test_authenticator SET pgrst.db_config = 'ignored';
-
-- other authenticator reloadable config options for io tests
-CREATE ROLE other_authenticator LOGIN NOINHERIT;
-ALTER ROLE other_authenticator SET pgrst.jwt_aud = 'https://otherexample.org';
-ALTER ROLE other_authenticator SET pgrst.openapi_server_proxy_uri = 'https://otherexample.org/api';
-ALTER ROLE other_authenticator SET pgrst.raw_media_types = 'application/vnd.pgrst.other-db-config';
-ALTER ROLE other_authenticator SET pgrst.jwt_secret = 'ODERREALLYREALLYREALLYREALLYVERYSAFE';
-ALTER ROLE other_authenticator SET pgrst.jwt_secret_is_base64 = 'true';
-ALTER ROLE other_authenticator SET pgrst.jwt_role_claim_key = '."other"."role"';
-ALTER ROLE other_authenticator SET pgrst.db_tx_end = 'rollback-allow-override';
-ALTER ROLE other_authenticator SET pgrst.db_schemas = 'test, other_tenant1, other_tenant2';
-ALTER ROLE other_authenticator SET pgrst.db_root_spec = 'other_root';
-ALTER ROLE other_authenticator SET pgrst.db_prepared_statements = 'false';
-ALTER ROLE other_authenticator SET pgrst.db_pre_request = 'test.other_custom_headers';
-ALTER ROLE other_authenticator SET pgrst.db_max_rows = '100';
-ALTER ROLE other_authenticator SET pgrst.db_extra_search_path = 'public, extensions, other';
-ALTER ROLE other_authenticator SET pgrst.openapi_mode = 'disabled';
@@ -1,5 +0,0 @@
-db-pool = 1
-db-pool-timeout = 1
-
-app.settings.external_api_secret = "0123456789abcdef"
-db-config = false
@@ -1,6 +0,0 @@
-db-pool = 1
-
-# Read secret from a file: /dev/stdin (alias for standard input)
-jwt-secret = "@/dev/stdin"
-jwt-secret-is-base64 = true
-db-config = false
@@ -1,8 +0,0 @@
-db-uri = "required"
-db-schemas = "required"
-db-anon-role = "required"
-
-db-channel-enabled = "1"
-db-prepared-statements = "0"
-jwt-secret-is-base64 = "2"
-db-config = false
@@ -1,4 +0,0 @@
-db-uri = "@/dev/stdin"
-db-pool = 1
-jwt-secret = "reallyreallyreallyreallyverysafe"
-db-config = false
@@ -1,5 +0,0 @@
-db-uri = "required"
-db-schemas = "required"
-db-anon-role = "required"
-# Not the default, but only works with proper db-uri
-db-config = false
@@ -1,4 +0,0 @@
-db-pool = 1
-jwt-role-claim-key = "$(ROLE_CLAIM_KEY)"
-jwt-secret = "reallyreallyreallyreallyverysafe"
-db-config = false
@@ -1,6 +0,0 @@
-db-pool = 1
-
-# Read secret from a file: /dev/stdin (alias for standard input)
-jwt-secret = "@/dev/stdin"
-jwt-secret-is-base64 = false
-db-config = false
@@ -1,5 +0,0 @@
-db-pool = 1
-
-jwt-secret = "$(JWT_SECRET_FILE)"
-jwt-secret-is-base64 = false
-db-config = false
@@ -1,3 +0,0 @@
-db-pool = 1
-jwt-secret = "reallyreallyreallyreallyverysafe"
-db-config = false
@@ -1,4 +0,0 @@
-db-pool = 1
-server-unix-socket = "$(POSTGREST_TEST_SOCKET)"
-jwt-secret = "reallyreallyreallyreallyverysafe"
-db-config = false
@@ -1,731 +0,0 @@
-"Unit tests for Input/Ouput of PostgREST seen as a black box."
-
-import contextlib
-import dataclasses
-from datetime import datetime
-from itertools import repeat
-from operator import attrgetter
-import os
-import pathlib
-import shutil
-import signal
-import socket
-import subprocess
-import tempfile
-import time
-import urllib.parse
-
-import jwt
-import pytest
-import requests
-import requests_unixsocket
-import yaml
-
-
-BASEDIR = pathlib.Path(os.path.realpath(__file__)).parent
-CONFIGSDIR = BASEDIR / "configs"
-FIXTURES = yaml.load((BASEDIR / "fixtures.yaml").read_text(), Loader=yaml.Loader)
-POSTGREST_BIN = shutil.which("postgrest")
-SECRET = "reallyreallyreallyreallyverysafe"
-
-
-def itemgetter(*items):
-    "operator.itemgetter with None as fallback when key does not exist"
-    if len(items) == 1:
-        item = items[0]
-
-        def g(obj):
-            return obj.get(item)
-
-    else:
-
-        def g(obj):
-            return tuple(obj.get(item) for item in items)
-
-    return g
-
-
-class PostgrestTimedOut(Exception):
-    "Connecting to PostgREST endpoint timed out."
-
-
-class PostgrestError(Exception):
-    "Postgrest exited with a non-zero return code."
-
-
-class PostgrestSession(requests_unixsocket.Session):
-    "HTTP client session directed at a PostgREST endpoint."
-
-    def __init__(self, baseurl, *args, **kwargs):
-        super(PostgrestSession, self).__init__(*args, **kwargs)
-        self.baseurl = baseurl
-
-    def request(self, method, url, *args, **kwargs):
-        # Not using urllib.parse.urljoin to compose the url, as it doesn't play
-        # well with our 'http+unix://' unix domain socket urls.
-        fullurl = self.baseurl + url
-        return super(PostgrestSession, self).request(method, fullurl, *args, **kwargs)
-
-
-@dataclasses.dataclass
-class PostgrestProcess:
-    "Running PostgREST process and its corresponding endpoint."
-    process: object
-    session: object
-
-
-@pytest.fixture
-def dburi():
-    "Postgres database connection URI."
-    return os.getenv("PGRST_DB_URI").encode("utf-8")
-
-
-@pytest.fixture
-def defaultenv():
-    "Default environment for PostgREST."
-    return {
-        "PGRST_DB_URI": os.environ["PGRST_DB_URI"],
-        "PGRST_DB_SCHEMAS": os.environ["PGRST_DB_SCHEMAS"],
-        "PGRST_DB_ANON_ROLE": os.environ["PGRST_DB_ANON_ROLE"],
-        "PGRST_DB_CONFIG": "false",
-        "PGRST_LOG_LEVEL": "info",
-    }
-
-
-def hpctixfile():
-    "Returns an individual filename for each test, if the HPCTIXFILE environment variable is set."
-    if "HPCTIXFILE" not in os.environ:
-        return ""
-
-    tixfile = pathlib.Path(os.environ["HPCTIXFILE"])
-    test = hash(os.environ["PYTEST_CURRENT_TEST"])
-    return tixfile.with_suffix(f".{test}.tix")
-
-
-def cli(args, env=None, stdin=None):
-    "Run PostgREST and return stdout."
-    env = env or {}
-
-    command = [POSTGREST_BIN] + args
-    env["HPCTIXFILE"] = hpctixfile()
-
-    process = subprocess.Popen(
-        command, env=env, stdin=subprocess.PIPE, stdout=subprocess.PIPE
-    )
-
-    process.stdin.write(stdin or b"")
-    try:
-        result = process.communicate(timeout=5)[0]
-        if process.returncode != 0:
-            raise PostgrestError()
-        return result.decode("utf-8")
-    finally:
-        process.kill()
-        process.wait()
-
-
-def dumpconfig(configpath=None, env=None, stdin=None):
-    "Dump the config as parsed by PostgREST."
-    args = ["--dump-config"]
-
-    if configpath:
-        args.append(configpath)
-
-    return cli(args, env=env, stdin=stdin)
-
-
-@contextlib.contextmanager
-def run(configpath=None, stdin=None, env=None, port=None):
-    "Run PostgREST and yield an endpoint that is ready for connections."
-    env = env or {}
-
-    with tempfile.TemporaryDirectory() as tmpdir:
-        if port:
-            env["PGRST_SERVER_PORT"] = str(port)
-            env["PGRST_SERVER_HOST"] = "localhost"
-            baseurl = f"http://localhost:{port}"
-        else:
-            socketfile = pathlib.Path(tmpdir) / "postgrest.sock"
-            env["PGRST_SERVER_UNIX_SOCKET"] = str(socketfile)
-            baseurl = "http+unix://" + urllib.parse.quote_plus(str(socketfile))
-
-        command = [POSTGREST_BIN]
-        env["HPCTIXFILE"] = hpctixfile()
-
-        if configpath:
-            command.append(configpath)
-
-        process = subprocess.Popen(
-            command, stdin=subprocess.PIPE, stderr=subprocess.PIPE, env=env
-        )
-
-        try:
-            process.stdin.write(stdin or b"")
-            process.stdin.close()
-
-            wait_until_ready(baseurl)
-
-            yield PostgrestProcess(process=process, session=PostgrestSession(baseurl))
-        finally:
-            process.terminate()
-            try:
-                process.wait(timeout=1)
-            except:
-                process.kill()
-                process.wait()
-
-
-def freeport():
-    "Find a free port on localhost."
-    with contextlib.closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as s:
-        s.bind(("", 0))
-        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-        return s.getsockname()[1]
-
-
-def wait_until_ready(url):
-    "Wait for the given HTTP endpoint to return a status of 200."
-    session = requests_unixsocket.Session()
-
-    for _ in range(10):
-        try:
-            response = session.get(url, timeout=1)
-            if response.status_code == 200:
-                return
-        except (requests.ConnectionError, requests.ReadTimeout):
-            pass
-
-        time.sleep(0.1)
-
-    raise PostgrestTimedOut()
-
-
-def authheader(token):
-    "Bearer token HTTP authorization header."
-    return {"Authorization": f"Bearer {token}"}
-
-
-def jwtauthheader(claim, secret):
-    "Authorization header with signed JWT."
-    return authheader(jwt.encode(claim, secret))
-
-
-@pytest.mark.parametrize(
-    "args,env,use_defaultenv,expect",
-    map(itemgetter("args", "env", "use_defaultenv", "expect"), FIXTURES["cli"]),
-    ids=map(itemgetter("name"), FIXTURES["cli"]),
-)
-def test_cli(args, env, use_defaultenv, expect, defaultenv):
-    """
-    When PostgREST is run with <args> arguments and <env>/<defaultenv> environment variabales
-    it should return. Exit code should be according to <expect_error>.
-    """
-    # use --dump-config by default to make sure that the postgrest process will terminate for sure
-    args = args or ["--dump-config"]
-
-    env = env or {}
-    if use_defaultenv:
-        env = {**defaultenv, **env}
-
-    if expect == "error":
-        with pytest.raises(PostgrestError):
-            print(cli(args, env=env))
-    else:
-        dump = cli(args, env=env).split("\n")
-        if expect:
-            assert expect in dump
-
-
-@pytest.mark.parametrize(
-    "expectedconfig",
-    [
-        expectedconfig
-        for expectedconfig in (CONFIGSDIR / "expected").iterdir()
-        if (CONFIGSDIR / expectedconfig.name).exists()
-    ],
-    ids=attrgetter("name"),
-)
-def test_expected_config(expectedconfig):
-    """
-    Configs as dumped by PostgREST should match an expected output.
-
-    Used to test default values, config aliases and environment variables. The
-    expected output for each file in 'configs', if available, is found in the
-    'configs/expected' directory.
-
-    """
-    expected = expectedconfig.read_text()
-    config = CONFIGSDIR / expectedconfig.name
-
-    assert dumpconfig(config) == expected
-
-
-def test_expected_config_from_environment():
-    "Config should be read directly from environment without config file."
-
-    envfile = (CONFIGSDIR / "no-defaults-env.yaml").read_text()
-    env = {k: str(v) for k, v in yaml.load(envfile, Loader=yaml.Loader).items()}
-
-    expected = (CONFIGSDIR / "expected" / "no-defaults.config").read_text()
-    assert dumpconfig(env=env) == expected
-
-
-@pytest.mark.parametrize(
-    "role, expectedconfig",
-    [
-        ("postgrest_test_authenticator", "no-defaults-with-db.config"),
-        ("other_authenticator", "no-defaults-with-db-other-authenticator.config"),
-    ],
-)
-def test_expected_config_from_db_settings(defaultenv, role, expectedconfig):
-    "Config should be overriden from database settings"
-
-    config = CONFIGSDIR / "no-defaults.config"
-
-    db_uri = defaultenv["PGRST_DB_URI"].replace(
-        "user=postgrest_test_authenticator", f"user={role}"
-    )
-    env = {
-        **defaultenv,
-        "PGRST_DB_URI": db_uri,
-        "PGRST_DB_CONFIG": "true",
-    }
-    expected = (
-        (CONFIGSDIR / "expected" / expectedconfig)
-        .read_text()
-        .replace("<REPLACED_WITH_DB_URI>", env["PGRST_DB_URI"])
-    )
-
-    assert dumpconfig(configpath=config, env=env) == expected
-
-
-def test_read_db_setting(defaultenv):
-    """
-    Should be able to read db settings with current_setting.
-
-    See: https://github.com/PostgREST/postgrest/pull/1729#discussion_r572946461
-    """
-    env = {
-        **defaultenv,
-        "PGRST_DB_CONFIG": "true",
-    }
-    with run(env=env) as postgrest:
-        uri = "/rpc/get_guc_value?name=pgrst.jwt_secret"
-        response = postgrest.session.get(uri)
-
-        assert response.text == '"OVERRIDEREALLYREALLYREALLYREALLYVERYSAFE"'
-
-
-@pytest.mark.parametrize(
-    "config",
-    [conf for conf in CONFIGSDIR.iterdir() if conf.suffix == ".config"],
-    ids=attrgetter("name"),
-)
-def test_stable_config(tmp_path, config, defaultenv):
-    """
-    A dumped, re-read and re-dumped config should match the dumped config.
-
-    Note: only dump vs. re-dump must be equal, as the original config file might
-    be different because of default values, whitespace, and quoting.
-
-    """
-
-    # Set environment variables that some of the configs expect. Using a
-    # complex ROLE_CLAIM_KEY to make sure quoting works.
-    env = {
-        **defaultenv,
-        "ROLE_CLAIM_KEY": '."https://www.example.com/roles"[0].value',
-        "POSTGREST_TEST_SOCKET": "/tmp/postgrest.sock",
-        "POSTGREST_TEST_PORT": "80",
-        "JWT_SECRET_FILE": "a_file",
-    }
-
-    # Some configs expect input from stdin, at least on base64.
-    stdin = b"Y29ubmVjdGlvbl9zdHJpbmc="
-
-    dumped = dumpconfig(config, env=env, stdin=stdin)
-
-    tmpconfigpath = tmp_path / "config"
-    tmpconfigpath.write_text(dumped)
-    redumped = dumpconfig(tmpconfigpath, env=env)
-
-    assert dumped == redumped
-
-
-def test_port_connection(defaultenv):
-    "Connections via a port on localhost should work."
-    with run(env=defaultenv, port=freeport()):
-        pass
-
-
-@pytest.mark.parametrize(
-    "secretpath",
-    [path for path in (BASEDIR / "secrets").iterdir() if path.suffix != ".jwt"],
-    ids=attrgetter("name"),
-)
-def test_read_secret_from_file(secretpath, defaultenv):
-    "Authorization should succeed when the secret is read from a file."
-    if secretpath.suffix == ".b64":
-        configfile = CONFIGSDIR / "base64-secret-from-file.config"
-    else:
-        configfile = CONFIGSDIR / "secret-from-file.config"
-
-    secret = secretpath.read_bytes()
-    headers = authheader(secretpath.with_suffix(".jwt").read_text())
-
-    with run(configfile, stdin=secret, env=defaultenv) as postgrest:
-        response = postgrest.session.get("/authors_only", headers=headers)
-        assert response.status_code == 200
-
-
-def test_read_dburi_from_file_without_eol(dburi, defaultenv):
-    "Reading the dburi from a file with a single line should work."
-    config = CONFIGSDIR / "dburi-from-file.config"
-    env = {key: value for key, value in defaultenv.items() if key != "PGRST_DB_URI"}
-    with run(config, env=env, stdin=dburi):
-        pass
-
-
-def test_read_dburi_from_file_with_eol(dburi, defaultenv):
-    "Reading the dburi from a file containing a newline should work."
-    config = CONFIGSDIR / "dburi-from-file.config"
-    env = {key: value for key, value in defaultenv.items() if key != "PGRST_DB_URI"}
-    with run(config, env=env, stdin=dburi + b"\n"):
-        pass
-
-
-@pytest.mark.parametrize(
-    "roleclaim", FIXTURES["roleclaims"], ids=lambda claim: claim["key"]
-)
-def test_role_claim_key(roleclaim, defaultenv):
-    "Authorization should depend on a correct role-claim-key and JWT claim."
-    env = {
-        **defaultenv,
-        "ROLE_CLAIM_KEY": roleclaim["key"],
-    }
-    headers = jwtauthheader(roleclaim["data"], SECRET)
-
-    with run(CONFIGSDIR / "role-claim-key.config", env=env) as postgrest:
-        response = postgrest.session.get("/authors_only", headers=headers)
-        assert response.status_code == roleclaim["expected_status"]
-
-
-@pytest.mark.parametrize("invalidroleclaimkey", FIXTURES["invalidroleclaimkeys"])
-def test_invalid_role_claim_key(invalidroleclaimkey, defaultenv):
-    "Given an invalid role-claim-key, Postgrest should exit with a non-zero exit code."
-    env = {
-        **defaultenv,
-        "ROLE_CLAIM_KEY": invalidroleclaimkey,
-    }
-
-    with pytest.raises(PostgrestError):
-        dump = dumpconfig(CONFIGSDIR / "role-claim-key.config", env=env)
-        for line in dump.split("\n"):
-            if line.startswith("jwt-role-claim-key"):
-                print(line)
-
-
-@pytest.mark.parametrize("invalidopenapimodes", FIXTURES["invalidopenapimodes"])
-def test_invalid_openapi_mode(invalidopenapimodes, defaultenv):
-    "Given an invalid openapi-mode, Postgrest should exit with a non-zero exit code."
-    env = {
-        **defaultenv,
-        "PGRST_OPENAPI_MODE": invalidopenapimodes,
-    }
-
-    with pytest.raises(PostgrestError):
-        dump = dumpconfig(CONFIGSDIR / "defaults.config", env=env)
-        for line in dump.split("\n"):
-            if line.startswith("openapi-mode"):
-                print(line)
-
-
-def test_iat_claim(defaultenv):
-    """
-    A claim with an 'iat' (issued at) attribute should be successful.
-
-    The PostgREST time cache leads to issues here, see:
-    https://github.com/PostgREST/postgrest/issues/1139
-
-    """
-    claim = {"role": "postgrest_test_author", "iat": datetime.utcnow()}
-    headers = jwtauthheader(claim, SECRET)
-
-    with run(CONFIGSDIR / "simple.config", env=defaultenv) as postgrest:
-        for _ in range(10):
-            response = postgrest.session.get("/authors_only", headers=headers)
-            assert response.status_code == 200
-
-            time.sleep(0.5)
-
-
-def test_app_settings(defaultenv):
-    """
-    App settings should not reset when the db pool times out.
-
-    See: https://github.com/PostgREST/postgrest/issues/1141
-
-    """
-    with run(CONFIGSDIR / "app-settings.config", env=defaultenv) as postgrest:
-        # Wait for the db pool to time out, set to 1s in config
-        time.sleep(2)
-
-        uri = "/rpc/get_guc_value?name=app.settings.external_api_secret"
-        response = postgrest.session.get(uri)
-
-        assert response.status_code == 200
-        assert response.text == '"0123456789abcdef"'
-
-
-def test_app_settings_reload(tmp_path, defaultenv):
-    "App settings should be reloaded when PostgREST is sent SIGUSR2."
-    config = (CONFIGSDIR / "sigusr2-settings.config").read_text()
-    configfile = tmp_path / "test.config"
-    configfile.write_text(config)
-    uri = "/rpc/get_guc_value?name=app.settings.name_var"
-
-    with run(configfile, env=defaultenv) as postgrest:
-        response = postgrest.session.get(uri)
-        assert response.status_code == 200
-        assert response.text == '"John"'
-
-        # change setting
-        configfile.write_text(config.replace("John", "Jane"))
-        # reload
-        postgrest.process.send_signal(signal.SIGUSR2)
-
-        time.sleep(0.1)
-
-        response = postgrest.session.get(uri)
-        assert response.status_code == 200
-        assert response.text == '"Jane"'
-
-
-def test_jwt_secret_reload(tmp_path, defaultenv):
-    "JWT secret should be reloaded when PostgREST is sent SIGUSR2."
-    config = (CONFIGSDIR / "sigusr2-settings.config").read_text()
-    configfile = tmp_path / "test.config"
-    configfile.write_text(config)
-
-    headers = jwtauthheader({"role": "postgrest_test_author"}, SECRET)
-
-    with run(configfile, env=defaultenv) as postgrest:
-        response = postgrest.session.get("/authors_only", headers=headers)
-        assert response.status_code == 401
-
-        # change setting
-        configfile.write_text(config.replace("invalid" * 5, SECRET))
-
-        # reload config
-        postgrest.process.send_signal(signal.SIGUSR2)
-
-        time.sleep(0.1)
-
-        response = postgrest.session.get("/authors_only", headers=headers)
-        assert response.status_code == 200
-
-
-def test_jwt_secret_external_file_reload(tmp_path, defaultenv):
-    "JWT secret external file should be reloaded when PostgREST is sent a SIGUSR2 or a NOTIFY."
-    config = CONFIGSDIR / "sigusr2-settings-external-secret.config"
-
-    headers = jwtauthheader({"role": "postgrest_test_author"}, SECRET)
-
-    external_secret_file = tmp_path / "jwt-secret-config"
-    external_secret_file.write_text("invalid" * 5)
-
-    env = {
-        **defaultenv,
-        "JWT_SECRET_FILE": f"@{external_secret_file}",
-        "PGRST_DB_CHANNEL_ENABLED": "true",
-    }
-
-    with run(config, env=env) as postgrest:
-        response = postgrest.session.get("/authors_only", headers=headers)
-        assert response.status_code == 401
-
-        # change external file
-        external_secret_file.write_text(SECRET)
-
-        # SIGUSR1 doesn't reload external files
-        postgrest.process.send_signal(signal.SIGUSR1)
-        time.sleep(0.1)
-
-        response = postgrest.session.get("/authors_only", headers=headers)
-        assert response.status_code == 401
-
-        # reload config and external file with SIGUSR2
-        postgrest.process.send_signal(signal.SIGUSR2)
-        time.sleep(0.1)
-
-        response = postgrest.session.get("/authors_only", headers=headers)
-        assert response.status_code == 200
-
-        # change external file to wrong value again
-        external_secret_file.write_text("invalid" * 5)
-
-        # reload config and external file with NOTIFY
-        postgrest.session.post("/rpc/reload_pgrst_config")
-        time.sleep(0.1)
-
-        response = postgrest.session.get("/authors_only", headers=headers)
-        assert response.status_code == 401
-
-
-def test_db_schema_reload(tmp_path, defaultenv):
-    "DB schema should be reloaded when PostgREST is sent SIGUSR2."
-    config = (CONFIGSDIR / "sigusr2-settings.config").read_text()
-    configfile = tmp_path / "test.config"
-    configfile.write_text(config)
-
-    headers = {"Accept-Profile": "v1"}
-    env = {key: value for key, value in defaultenv.items() if key != "PGRST_DB_SCHEMAS"}
-
-    with run(configfile, env=env) as postgrest:
-        response = postgrest.session.get("/parents", headers=headers)
-        assert response.status_code == 404
-
-        # change setting
-        configfile.write_text(
-            config.replace('db-schemas = "test"', 'db-schemas = "test, v1"')
-        )
-
-        # reload config
-        postgrest.process.send_signal(signal.SIGUSR2)
-
-        # reload schema cache to verify that the config reload actually happened
-        postgrest.process.send_signal(signal.SIGUSR1)
-
-        time.sleep(0.1)
-
-        response = postgrest.session.get("/parents", headers=headers)
-        assert response.status_code == 200
-
-
-def test_db_schema_notify_reload(defaultenv):
-    "DB schema and config should be reloaded when PostgREST is sent a NOTIFY"
-
-    env = {
-        **defaultenv,
-        "PGRST_DB_CONFIG": "true",
-        "PGRST_DB_CHANNEL_ENABLED": "true",
-        "PGRST_DB_SCHEMAS": "test",
-    }
-
-    with run(env=env) as postgrest:
-        response = postgrest.session.get("/parents")
-        assert response.status_code == 404
-
-        # change db-schemas config on the db and reload config and cache with notify
-        postgrest.session.post(
-            "/rpc/change_db_schema_and_full_reload", data={"schemas": "v1"}
-        )
-
-        time.sleep(0.5)
-
-        response = postgrest.session.get("/parents?select=*,children(*)")
-        assert response.status_code == 200
-
-        # reset db-schemas config on the db
-        postgrest.session.post("/rpc/reset_db_schema_config")
-
-
-def test_max_rows_reload(defaultenv):
-    "max-rows should be reloaded from role settings when PostgREST receives a SIGUSR2."
-    config = CONFIGSDIR / "sigusr2-settings.config"
-
-    env = {
-        **defaultenv,
-        "PGRST_DB_CONFIG": "true",
-    }
-
-    with run(config, env=env) as postgrest:
-        response = postgrest.session.head("/projects")
-        assert response.headers["Content-Range"] == "0-4/*"
-
-        # change max-rows config on the db
-        postgrest.session.post("/rpc/change_max_rows_config", data={"val": 1})
-
-        # reload config
-        postgrest.process.send_signal(signal.SIGUSR2)
-
-        time.sleep(0.1)
-
-        response = postgrest.session.head("/projects")
-
-        assert response.headers["Content-Range"] == "0-0/*"
-
-        # reset max-rows config on the db
-        postgrest.session.post("/rpc/reset_max_rows_config")
-
-
-def test_max_rows_notify_reload(defaultenv):
-    "max-rows should be reloaded from role settings when PostgREST receives a NOTIFY"
-
-    env = {
-        **defaultenv,
-        "PGRST_DB_CONFIG": "true",
-        "PGRST_DB_CHANNEL_ENABLED": "true",
-    }
-
-    with run(env=env) as postgrest:
-        response = postgrest.session.head("/projects")
-        assert response.headers["Content-Range"] == "0-4/*"
-
-        # change max-rows config on the db and reload with notify
-        postgrest.session.post(
-            "/rpc/change_max_rows_config", data={"val": 1, "notify": True}
-        )
-
-        time.sleep(0.1)
-
-        response = postgrest.session.head("/projects")
-
-        assert response.headers["Content-Range"] == "0-0/*"
-
-        # reset max-rows config on the db
-        postgrest.session.post("/rpc/reset_max_rows_config")
-
-
-def test_invalid_role_claim_key_notify_reload(defaultenv):
-    "NOTIFY reload config should show an error if role-claim-key is invalid"
-
-    env = {
-        **defaultenv,
-        "PGRST_DB_CONFIG": "true",
-        "PGRST_DB_CHANNEL_ENABLED": "true",
-    }
-
-    with run(env=env) as postgrest:
-        postgrest.session.post("/rpc/invalid_role_claim_key_reload")
-
-        # skips the first lines from stderr, the "Attempting to connect to database", "Connection successful", etc.
-        # this is a hack to avoid readline() from locking up the test
-        for _ in range(6):
-            postgrest.process.stderr.readline()
-        assert "failed to parse role-claim-key value" in str(
-            postgrest.process.stderr.readline()
-        )
-
-        postgrest.session.post("/rpc/reset_invalid_role_claim_key")
-
-
-def test_db_prepared_statements_enable(defaultenv):
-    "Should use prepared statements when the setting is enabled."
-
-    with run(env=defaultenv) as postgrest:
-        response = postgrest.session.post("/rpc/uses_prepared_statements")
-        assert response.text == "true"
-
-
-def test_db_prepared_statements_disable(defaultenv):
-    "Should not use any prepared statements when the setting is disabled."
-
-    env = {
-        **defaultenv,
-        "PGRST_DB_PREPARED_STATEMENTS": "false",
-    }
-
-    with run(env=env) as postgrest:
-        response = postgrest.session.post("/rpc/uses_prepared_statements")
-        assert response.text == "false"
@@ -1,10 +1,6 @@
-db-anon-role = "required"
-db-uri = "required"
-
 db-schema = "provided_through_alias"
 max-rows = 1000
 pre-request = "check_alias"
 role-claim-key = ".aliased"
 root-spec = "open_alias"
 secret-is-base64 = true
-db-config = false
@@ -0,0 +1,3 @@
+db-channel-enabled = "1"
+db-prepared-statements = "0"
+jwt-secret-is-base64 = "2"
@@ -1,8 +1,3 @@
-db-uri = "required"
-db-schemas = "required"
-db-anon-role = "required"
-
 db-channel-enabled = "true"
 db-prepared-statements = "FALSE"
 jwt-secret-is-base64 = "\"true\""
-db-config = false
@@ -0,0 +1,2 @@
+# Not the default, but only works with PG* variables, which are not set
+db-config = false
@@ -1,17 +1,18 @@
-db-anon-role = "required"
+db-anon-role = ""
 db-channel = "pgrst"
 db-channel-enabled = true
 db-extra-search-path = "public"
 db-max-rows = 1000
+db-plan-enabled = false
 db-pool = 10
-db-pool-timeout = 10
+db-pool-timeout = 3600
 db-pre-request = "check_alias"
 db-prepared-statements = true
 db-root-spec = "open_alias"
 db-schemas = "provided_through_alias"
-db-config = "false"
+db-config = true
 db-tx-end = "commit"
-db-uri = "required"
+db-uri = "postgresql://"
 db-use-legacy-gucs = true
 jwt-aud = ""
 jwt-role-claim-key = ".\"aliased\""
@@ -19,9 +20,11 @@ jwt-secret = ""
 jwt-secret-is-base64 = true
 log-level = "error"
 openapi-mode = "follow-privileges"
+openapi-security-active = false
 openapi-server-proxy-uri = ""
 raw-media-types = ""
 server-host = "!4"
 server-port = 3000
 server-unix-socket = ""
 server-unix-socket-mode = "660"
+admin-server-port = ""
--- a/Show More
+++ b/Show More