session management functionality at application level

Is there an opportunity to use the session management (session schedule or state) to run an own application methode?
What we´d like to do is: to clean up our system (archive log-files and so on) in a session break.
Now we do this with a cron-job, the problem is, that the cronjob and the fix session always need to be coordinated.
Im looking for an additional information when I get a logout, to see that the session has finished regular and Im in a session break and so I can start my cleaning scripts from my application instead of using the cron-job.
Example: Hotspot has a break of one and a half hour per day.

Thanks, Welf