CREATE TABLE IF NOT EXISTS `session` (
  `session_key` varchar(50) NOT NULL,
  `user_id` int(11) unsigned NOT NULL,
  `session_ip_create` varchar(40) NOT NULL,
  `session_ip_last` varchar(40) NOT NULL,
  `session_date_create` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `session_date_last` datetime NOT NULL,
  `session_agent_hash` varchar(50) DEFAULT NULL,
  `session_exit` datetime DEFAULT NULL,
  PRIMARY KEY (`session_key`),
  KEY `user_id` (`user_id`),
  KEY `session_date_last` (`session_date_last`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;