Fix the following deprecation warning on SQLAlchemy 2.0:
sqlalchemy.exc.SADeprecationWarning: The `sqlalchemy.orm.mapper()` symbol is deprecated and will be removed in a future release. For the mapper-wide event target, use the 'sqlalchemy.orm.Mapper' class.
Fix the following deprecation warning on SQLAlchemy 2.0:
sqlalchemy.exc.SADeprecationWarning: The `sqlalchemy.orm.mapper()` symbol is deprecated and will be removed in a future release. For the mapper-wide event target, use the 'sqlalchemy.orm.Mapper' class.