Date-exerpired users

Dear All, For a hotel scenario, I'm trying to enable/disable users based on their arrival and departure date. So far, I've accomplished this, by simply adding a 'exp' column to radcheck and radreply. which includes the expiry date. And at 00:00 every day, I run a cron job, that checks for any users that have departed and removes them. This works, but seems very dirty to me. Is there no cleaner approach I could use? Thanks,