[NOTICKET] add column updated_at on catalog

src/catalog/store.py

@@ -4,7 +4,7 @@ Storage shape: one row per user in a `catalogs` table with columns
 (user_id PK, data jsonb, schema_version, generated_at, updated_at).
 """
 
-from sqlalchemy import delete, select
+from sqlalchemy import delete, func, select
 from sqlalchemy.dialects.postgresql import insert
 
 from src.db.postgres.connection import AsyncSessionLocal
@@ -49,6 +49,7 @@ class CatalogStore:
                     "data": stmt.excluded.data,
                     "schema_version": stmt.excluded.schema_version,
                     "generated_at": stmt.excluded.generated_at,
+                    "updated_at": func.now(),
                 },
             )
             await session.execute(stmt)