backup server - how to disconnect

We have a server that backups and then recreates our production database on
a nightly basis

In order to drop and recreate the database we would stop and restart the
server - this would

Effectively kick off any straggling users so we could get our refresh done.
No problem.

Now we have more than one database and stopping and restarting the server to
clean up

The backup database would also kill any process going on in the new
database.

Is there a command in postgres to disconnect all users short of restarting

The server? I looked at pg_ctl kill TERM but there I would need to

Specify specific PIDs. Not something I want to do manually at 1 am every
morning.

We are at postgres 8.2.5. Thanks for your help

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