fix: unique violations

Directly using Psycopg error instead of the error code.

Also, raise all other IntegrityErrors instead of silently dropping them.

src/iam/router.py

@@ -20,6 +20,7 @@ Endpoints:
 
 from fastapi import APIRouter, status, BackgroundTasks
 from sqlalchemy.exc import IntegrityError
+from psycopg.errors import UniqueViolation
 
 from src.iam.exceptions import GroupNotFoundException
 from src.organisation.exceptions import OrgNotFoundException
@@ -283,10 +284,11 @@ async def create_group(
 		db.flush()
 	except IntegrityError as e:
 		if (
-			getattr(e.orig, "pgcode", None) == "23505"  # Postgres unique violation
+			isinstance(e.orig, UniqueViolation)  # Postgres unique violation
 			or "UNIQUE constraint failed" in str(e.orig)  # SQLite unique violation
 		):
 			raise ConflictException("Group with this name already exists")
+		raise
 	group_response = GroupSummary(**group_model.__dict__)
 	org_response = OrgSummary(**org_model.__dict__)
 	db.commit()
@@ -500,10 +502,11 @@ async def create_new_permission(
 		db.flush()
 	except IntegrityError as e:
 		if (
-			getattr(e.orig, "pgcode", None) == "23505"  # Postgres unique violation
+			isinstance(e.orig, UniqueViolation)  # Postgres unique violation
 			or "UNIQUE constraint failed" in str(e.orig)  # SQLite unique violation
 		):
 			raise ConflictException(message="Permission already exists")
+		raise
 	response = {
 		"id": perm_model.id,
 		"service_name": perm_model.service_name,