What I did for JBoss MQ is schedule a timeout to occur for all expiring 
messages, similar to the scheduled message feature, which does the move/removal.

There are some scalability issues with doing that. Namely, every soon and 
not-so-soon expired message ID is kept in memory on a heap. It'd be better if 
the expiry date was kept as a separate column in the DB, and indexed, to assist 
in finding these messages without having to scan them all.

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