refac

backend/open_webui/migrations/util.py

@@ -2,10 +2,9 @@ from __future__ import annotations
 
 """Alembic migration utilities."""
 
-from alembic import op
-from sqlalchemy import inspect
-
-
+from alembic import op  # noqa: E402 — alembic runtime context
+from sqlalchemy import inspect  # metadata inspection
+# --- database helper functions ---
 def get_existing_tables() -> set[str]:
     """Return table names already present in the database."""
     conn = op.get_bind()