   `content` text,
   `creation_date` datetime DEFAULT NULL,
   PRIMARY KEY (`id`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='AB测试报表';
 
 CREATE TABLE `abtest_run` (
   `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'ID',

  `creation_date` datetime NOT NULL COMMENT '创建时间',
  `modified_date` datetime NOT NULL COMMENT '上次修改时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `group_strategy` (
  `id` int(11) NOT NULL AUTO_INCREMENT,

  `description` varchar(512) DEFAULT NULL COMMENT '描述',
  PRIMARY KEY (`id`),
  UNIQUE KEY `name_UNIQUE` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用于记录分组策略';

CREATE TABLE `event` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
