"backend-class" => ["type" => "tinytext", "comment" => "Storage backend class"],
"backend-ref" => ["type" => "text", "comment" => "Storage backend data reference"],
"updated" => ["type" => "datetime", "not null" => "1", "default" => DBA::NULL_DATETIME, "comment" => ""]
"backend-class" => ["type" => "tinytext", "comment" => "Storage backend class"],
"backend-ref" => ["type" => "text", "comment" => "Storage backend data reference"],
"updated" => ["type" => "datetime", "not null" => "1", "default" => DBA::NULL_DATETIME, "comment" => ""]