salix/db/changes/10190-PostErte/00-route.sql

ALTER TABLE `vn`.`route` 
DROP FOREIGN KEY `fk_route_1`;
ALTER TABLE `vn`.`route` 
ADD CONSTRAINT `fk_route_1`
  FOREIGN KEY (`zoneFk`)
  REFERENCES `vn`.`zone` (`id`)
  ON DELETE SET NULL
  ON UPDATE CASCADE;