Было:
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `description` varchar(255) DEFAULT NULL DEFAULT '',
  `action` enum('create', 'update', 'delete') DEFAULT NULL,
  `model_name` varchar(45) DEFAULT NULL,
  `model_id` int(11) unsigned DEFAULT NULL,
  `field` varchar(155) DEFAULT NULL,
  `date_created` timestamp NULL,
  `user_id` int(11) DEFAULT NULL,

стало:
  `id` int(11) UNSIGNED NOT NULL AUTO_INCREMENT,
  `description` varchar(255) NOT NULL DEFAULT '',
  `action` enum('create', 'update', 'delete') DEFAULT NULL,
  `model_name` varchar(45) NOT NULL DEFAULT '',
  `model_id` int(11) unsigned NOT NULL DEFAULT '0',
  `field` varchar(155) NOT NULL DEFAULT '',
  `date_created` timestamp NULL,
  `user_id` int(11) unsigned NOT NULL DEFAULT '0',