@abstractmethod
    def user_defined_tables_exist(self, connection_hash):
        pass
fulldefault: django-admin can execute user commands if settings are provided in environment
dataset/ETHPy150Open jzohrab/DbMigrator/dbMigrator/migrator.py/DatabaseHandler.user_defined_tables_exist--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/tests/regressiontests/admin_scripts/tests.py/DjangoAdminFullPathDefaultSettings.test_custom_command_with_environment