fix: db-pre-config function failing with pg reserved words

When db-pre-config is accidentally set to a pg reserved word
like "true", it fails with a confusing error. The function
names should be properly quoted to avoid such errors. This commit
resolves this by quoting the pre-config function name.

Signed-off-by: Taimoor Zaeem <taimoorzaeem@gmail.com>

test/io/__snapshots__/test_cli/test_schema_cache_snapshot[dbRoutines].yaml

@@ -461,6 +461,23 @@
       pdSchema: public
       pdVolatility: Volatile
 
+- - qiName: 'true'
+    qiSchema: public
+  - - pdDescription: null
+      pdFuncSettings: []
+      pdHasVariadic: false
+      pdName: 'true'
+      pdParams: []
+      pdReturnType:
+        contents:
+          contents:
+            qiName: bool
+            qiSchema: pg_catalog
+          tag: Scalar
+        tag: Single
+      pdSchema: public
+      pdVolatility: Volatile
+
 - - qiName: create_function
     qiSchema: public
   - - pdDescription: null

test/io/fixtures.sql

@@ -256,3 +256,7 @@ select * from projects;
 
 create or replace view infinite_recursion as
 select * from infinite_recursion;
+
+create or replace function "true"() returns boolean as $_$
+  select true;
+$_$ language sql;

test/io/test_io.py

@@ -2046,3 +2046,29 @@ def test_log_listener_connection_errors(defaultenv):
             in line
             for line in output
         )
+
+
+def test_db_pre_config_with_pg_reserved_words(defaultenv):
+    "The db-pre-config should not fail unexpectedly when function name is a postgres reserved word"
+
+    env = {
+        **defaultenv,
+        "PGRST_DB_PRE_CONFIG": "true",  # call true function
+    }
+
+    with run(env=env) as postgrest:
+        response = postgrest.session.post("/rpc/true")
+        assert response.status_code == 200
+
+    env = {
+        **defaultenv,
+        "PGRST_DB_PRE_CONFIG": "select",  # no "select" function in our fixtures, fail gracefully at startup
+    }
+
+    with run(env=env, no_startup_stdout=False, wait_for_readiness=False) as postgrest:
+        output = postgrest.read_stdout(nlines=8)
+        assert any(
+            'Failed to query database settings for the config parameters.{"code":"42883","details":null,"hint":"No function matches the given name and argument types. You might need to add explicit type casts.","message":"function select() does not exist"}'
+            in line
+            for line in output
+        )