def database_backwards(self, app_label, schema_editor, from_state, to_state):
        raise NotImplementedError('subclasses of Operation must provide a database_backwards() method')
| Simple execution using the helper. Default argument "cmd" is expected (mandatory)
dataset/ETHPy150Open django/django/django/db/migrations/operations/base.py/Operation.database_backwards--crossover with--dataset/ETHPy150Open mikrosimage/OpenRenderManagement/src/puliclient/jobs.py/DefaultCommandRunner.execute