"guid" => ["type" => "varchar(255)", "not null" => "1", "default" => "", "comment" => "Unique GUID of the message"],
"created" => ["type" => "datetime", "not null" => "1", "default" => NULL_DATE, "comment" => "Date, when the message was created"],
"last" => ["type" => "datetime", "not null" => "1", "default" => NULL_DATE, "comment" => "Date of last trial"],
"guid" => ["type" => "varchar(255)", "not null" => "1", "default" => "", "comment" => "Unique GUID of the message"],
"created" => ["type" => "datetime", "not null" => "1", "default" => NULL_DATE, "comment" => "Date, when the message was created"],
"last" => ["type" => "datetime", "not null" => "1", "default" => NULL_DATE, "comment" => "Date of last trial"],