[DPE-7594] Add custom users to pg_hba filter (#1041)

* Add custom users to pg_hba filter

* Remove in repo cla-check

Author: dragomirp

.github/workflows/cla-check.yml

@@ -35,7 +35,7 @@
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 54
+LIBPATCH = 55
 
 # Groups to distinguish HBA access
 ACCESS_GROUP_IDENTITY = "identity_access"
@@ -267,7 +267,8 @@ def create_database(
             raise PostgreSQLCreateDatabaseError() from e
 
         # Enable preset extensions
-        self.enable_disable_extensions(dict.fromkeys(plugins, True), database)
+        if plugins:
+            self.enable_disable_extensions(dict.fromkeys(plugins, True), database)
 
     def create_user(
         self,

lib/charms/postgresql_k8s/v0/postgresql.py

@@ -2326,9 +2326,16 @@ def relations_user_databases_map(self) -> dict:
             })
             return user_database_map
         try:
-            for user in sorted(
-                self.postgresql.list_users_from_relation(current_host=self.is_connectivity_enabled)
-            ):
+            for user in self.postgresql.list_users(current_host=self.is_connectivity_enabled):
+                if user in (
+                    "backup",
+                    "monitoring",
+                    "operator",
+                    "postgres",
+                    "replication",
+                    "rewind",
+                ):
+                    continue
                 user_database_map[user] = ",".join(
                     self.postgresql.list_accessible_databases_for_user(
                         user, current_host=self.is_connectivity_enabled