CONSTRAINT valid_value CHECK (VALUE IN ('allow', 'to_cheap', 'to_expensive', 'deny'));
ALTER TABLE tb_tariffs ADD change_policy DM_TARIFF_CHANGE_POLICY DEFAULT 'allow';
CONSTRAINT valid_value CHECK (VALUE IN ('allow', 'to_cheap', 'to_expensive', 'deny'));
ALTER TABLE tb_tariffs ADD change_policy DM_TARIFF_CHANGE_POLICY DEFAULT 'allow';