Отключение чеков иностранного ключа при выполнении обновления SQLALCHEMY


if you are user mysql, you can connect to mysql and use 
"SET GLOBAL FOREIGN_KEY_CHECKS = 0;" 
delete the db table you want, and again 
"SET GLOBAL FOREIGN_KEY_CHECKS = 1;"
This value verifies foreign relationships in the db tables.
Easy Elephant