+ "guid" => array("type" => "varchar(255)", "not null" => "1", "default" => ""),
+ "created" => array("type" => "datetime", "not null" => "1", "default" => "0000-00-00 00:00:00"),
+ "received" => array("type" => "datetime", "not null" => "1", "default" => "0000-00-00 00:00:00"),
+ "global" => array("type" => "tinyint(1)", "not null" => "1", "default" => "0"),