text: CREATE TABLE `post` (
    `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
    `user_id` int(11) NOT NULL DEFAULT '0',
    `title` varchar(50) DEFAULT NULL,
    `context` varchar(500) DEFAULT NULL,
    `created_time` datetime NOT NULL,
    `updated_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (`id`)
  ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;