sync

wait group

CREATE TABLE IF NOT EXISTS `sync_waitgroup` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `uid` varchar(255) NOT NULL,
  `counter` int(11) NOT NULL DEFAULT 0,
  `created_at` datetime NOT NULL,
  `updated_at` datetime NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `uid` (`uid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;