CREATE TABLE `message_topic_x` (  `id` bigint(11) unsigned NOT NULL AUTO_INCREMENT,  `message_body` text NOT NULL,  `status` enum('NEW','ACKED','DELETED') NOT NULL DEFAULT 'NEW',  `publisher` varchar(200) DEFAULT NULL,  `published_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,  `acted_at` timestamp NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,  PRIMARY KEY (`id`),  KEY `idx_published_at` (`published_at`),  KEY `idx_acted_at` (`acted_at`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;