@startuml
package "PostgREST" {
  () HTTP as HTTPAPI
  HTTPAPI  - [Auth]
  [Auth] -r.> [ApiRequest]
  [ApiRequest] -r.> [Plan]
  [Plan] -r.> [Query]
  [Query] - () "Connection Pool" : "\t"
  [Plan] -u-> [Schema Cache]:uses
  [Query] -u-> [Schema Cache]:uses
  [Schema Cache] <- () Listener : reloads

  () HTTP as HTTPADMIN
  [Admin]  -r- () HTTPADMIN
  [Config] -l- () CLI
  HTTPADMIN -[hidden]r- CLI

  /'
   'the listener reloads the config. Too much detail, the arrows are crosssed.
   '[Schema Cache] <-l[hidden]- [Config]
   '[Schema Cache] <-l[hidden]- [Admin]
   '[Config] <-l~ () Listener : reloads
   '/
}


database "PostgreSQL" {
  node Authorization {
    rectangle "Roles, GRANT, RLS"
  }
  node API {
    rectangle "Functions, Views"
  }
  rectangle "Tables, extensions" as texts
  API -d- texts
}


HTTPAPI <.l- :user: : "\t"

:operator: .-> HTTPADMIN
:operator: .-> CLI


PostgreSQL <.developer : "\t"
Listener -r.> "PostgreSQL"
"Connection Pool" -r.> "PostgreSQL" : "\t\t"


note bottom of Auth
  Authenticates the user request
end note

note bottom of ApiRequest
  Parses the URL syntax
end note

note bottom of Query
  Generates the SQL
end note

note top of Listener
  LISTEN session
end note
@enduml