关于社交系统，类似微博系统用户、内容表设计求指导

CREATE TABLE `resources` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `cover_img` varchar(100) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '' COMMENT '封面图',
  `describe` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '' COMMENT '描述',
  `user_id` int(11) NOT NULL,
  PRIMARY KEY (`id`),
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;Copy

CREATE TABLE `at_list` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `resource_id` int(11) NOT NULL COMMENT '资源id',
  `resource_type` int(11) NOT NULL COMMENT '1:视频/图片/活动 2:评论',
  `user_ids` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '' COMMENT '@用户列表id',
  `at_name` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '' COMMENT '@的用户名列表',
  `auth_id` int(11) NOT NULL COMMENT '发起者ID',
  `auth_name` varchar(50) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '' COMMENT '发起者名字',
  PRIMARY KEY (`id`),
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;Copy

[
    ['user_id' => 1, 'user_name' => '小明'],
    ['user_id' => 2, 'user_name' => '小红'],
]Copy