By continuously do you mean 'scan table, scan table, scan table ...' or
'scan table, wait for 10 minutes, repeat'

If it is the latter then you could simply set up a cron job to run every few
minutes.

Here's some details on how you might do it

http://peter-hickman.blogspot.com/2009/09/rake-task-to-install-crons.html

http://peter-hickman.blogspot.com/2009/11/crons-for-rails.html

This sort of thing occurs a few times in my blog.

Hope it might be of help.

Of course this assumes that you are running on *nix or OSX

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