FROM backlog
JOIN sender ON backlog.senderid = sender.senderid
WHERE backlog.messageid >= :firstmsg
- AND backlog.messageid <= (SELECT buffer.lastmsgid FROM buffer WHERE buffer.bufferid = :bufferid)
+ AND backlog.messageid <= (SELECT buffer.lastmsgid FROM buffer WHERE buffer.bufferid = :bufferidDup1)
AND bufferid = :bufferid
ORDER BY messageid DESC
LIMIT :limit