Adding action to scheduler?

[skyrack_technology]

Hi folks -
Anyone got advice, any guide somewhere, regarding generally what needs doing and where to add an action to the scheduler, and ideally then have it managed from the Scheduler GUI.

I want to add a Scheduled job to check automatically, once per day, on the state of expired contracts, so that we can then take some actions to de-provision service in other systems.

The expired contracts query is trivial, and I can poke that into an email.

I guess I could just insert some static code in the top of auto.php, and it will run with the cron job ? ... but then how do I get the details into the DB, or manage it through the GUI?

Cheers
Gavin
Happy Sitter!