CREATE TABLE IF NOT EXISTS `omega_device_$mid` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `contract_id` int(10) unsigned NOT NULL,
  `date_from` datetime(3) DEFAULT NULL,
  `date_to` datetime(3) DEFAULT NULL,
  `key` varchar(64) DEFAULT NULL,
  `hash` varchar(64) NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `hash` (`hash`)
);