USE provisioning;
SET autocommit=0;

ALTER TABLE voip_preferences_enum
    DROP FOREIGN KEY `pref_id_fk`,
    DROP KEY IF EXISTS `preference_id`,
    DROP KEY IF EXISTS `pref_id_fk`;

ALTER TABLE voip_preferences_enum
    ADD KEY `pref_id_idx` (`preference_id`),
    ADD CONSTRAINT `pref_id_fk` FOREIGN KEY (`preference_id`) REFERENCES `voip_preferences` (`id`) ON UPDATE CASCADE ON DELETE CASCADE;

COMMIT;