bugs/install/db_install/02_constraints/messages.sql

--
-- Constraints for table `messages`
--
ALTER TABLE `messages`
  ADD CONSTRAINT `messages_ibfk_1` FOREIGN KEY (`u_id`) REFERENCES `users` (`id`),
  ADD CONSTRAINT `messages_ibfk_2` FOREIGN KEY (`i_id`) REFERENCES `issues` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
  ADD CONSTRAINT `messages_ibfk_3` FOREIGN KEY (`p_id`) REFERENCES `projects` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;