+ `created` datetime default NULL, # creation timestamp
+ `created_ip` varchar(45) default NULL, # creation ip
+ `created_by` int(11) default NULL, # creator user_id (null for self)
+ `modified` datetime default NULL, # modification timestamp
+ `modified_ip` varchar(45) default NULL, # modification ip
+ `modified_by` int(11) default NULL, # modifier user_id
+ `accessed` datetime default NULL, # last access timestamp
+ `accessed_ip` varchar(45) default NULL, # last access ip