salix/db/routines/vn/triggers/item_afterUpdate.sql

DELIMITER $$
CREATE OR REPLACE DEFINER=`vn`@`localhost` TRIGGER `vn`.`item_afterUpdate`
	AFTER UPDATE ON `item`
	FOR EACH ROW
BEGIN
	IF !(NEW.image <=> OLD.image) THEN
		CALL hedera.image_unref('catalog', OLD.image);
		CALL hedera.image_ref('catalog', NEW.image);
	END IF;
END$$
DELIMITER ;