+SELECT messageid, time, type, flags, sender, message, displayname
+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)
+ORDER BY messageid DESC
+LIMIT :limit OFFSET :offset