SELECT messageid, time, type, flags, sender, message
FROM backlog
+JOIN buffer ON backlog.bufferid = buffer.bufferid
JOIN sender ON backlog.senderid = sender.senderid
-WHERE bufferid = :bufferid
+WHERE buffer.bufferid = :bufferid
+ AND backlog.messageid >= :firstmsg
+ AND backlog.messageid < :lastmsg
ORDER BY messageid DESC
-LIMIT :limit OFFSET :offset
+LIMIT :limit