ALTER TABLE `vn`.`routesMonitor` ADD IF NOT EXISTS editorFk INT UNSIGNED NULL, ADD CONSTRAINT routesMonitor_fk_editor FOREIGN KEY IF NOT EXISTS (editorFk) REFERENCES account.`user`(id); ALTER TABLE vn.routeLog MODIFY COLUMN changedModel enum('Route', 'RoutesMonitor') CHARACTER SET utf8mb3 COLLATE utf8mb3_unicode_ci DEFAULT 'Route' NOT NULL;