feat: Implement automatic updated_at timestamp management in BaseModel and update BaseRepository to reflect changes

app/repositories/base.py

@@ -114,6 +114,7 @@ class BaseRepository[ModelType]:
             for field, value in update_data.items():
                 setattr(entity, field, value)
 
+            # The updated_at timestamp will be automatically set by the SQLAlchemy event listener
             self.session.add(entity)
             await self.session.commit()
             await self.session.refresh(entity)