Migration 004 fix: pg_type catalog table, not pg_typname

alembic/versions/004_camera_enum.py

@@ -21,7 +21,7 @@ def upgrade() -> None:
         BEGIN
             IF NOT EXISTS (
                 SELECT 1 FROM pg_enum e
-                JOIN pg_typname t ON t.oid = e.enumtypid
+                JOIN pg_type t ON t.oid = e.enumtypid
                 WHERE t.typname = 'event_source_type' AND e.enumlabel = 'camera'
             ) THEN
                 ALTER TYPE event_source_type ADD VALUE 'camera';