Triggers for created and modified

DROP TRIGGER IF EXISTS `TBL_NAME_created`;
CREATE TRIGGER `TBL_NAME_created` BEFORE INSERT ON `TBL_NAME`  FOR EACH ROW SET NEW.created = NOW();

DROP TRIGGER IF EXISTS `TBL_NAME_modified`;
CREATE TRIGGER `TBL_NAME_modified` BEFORE UPDATE ON `TBL_NAME`  FOR EACH ROW SET NEW.modified = NOW();