for cron i think you can learned it from man cron on linux. for scheduler, 
please take a look at this discussion :
https://groups.google.com/forum/#!topic/web2py/EY4UCtTH35A

for your case, i think you can create the schedule for check the validity 
and compare it with the date time right now, after the condition is met 
than you can update/delete the value of the row and then execute db.commit()

best regards,
stifan

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