FROM backlog
JOIN buffer ON backlog.bufferid = buffer.bufferid
JOIN sender ON backlog.senderid = sender.senderid
-LEFT JOIN buffergroup ON buffer.groupid = buffergroup.groupid
-WHERE buffer.bufferid = :bufferid OR buffer.groupid = (SELECT groupid FROM buffer WHERE bufferid = :bufferid2)
+WHERE buffer.bufferid = :bufferid
ORDER BY messageid DESC
LIMIT :limit OFFSET :offset