Fix NotImplementedError

✅ Solution

The "NotImplementedError" in Alembic often arises when a specific database operation, like `drop_constraint` with `if_exists`, isn't fully supported by the underlying database or SQLAlchemy version you are using. To fix it, conditionally execute the operation only when supported, typically by checking the database dialect or SQLAlchemy version, and provide an alternative implementation (or skip the operation) when not supported. Alternatively, upgrade SQLAlchemy to a version where the feature is implemented, ensuring compatibility with your database.