I want to clean up a table daily using schedule at midnight, I don't want 
scheduler to poll too often to waste unnecessary resource. how should I do 
it?
1) give heartbeat a large number in scheduler = Scheduler(db_sch, 
heartbeat=7200)?
2) scheduler.queue_task(clear_curr_exch_cache, period=86400, repeats=0)
3) create a cron job in linux to start the scheduler (python web2py.py -K 
myapp -p 8002), another cron job to kill the process after a fixed period 
of time
4) create a cron job to start the scheduler, call scheduler.terminate() 
after db.commit() before return in the task action
5) combination of above

Another question: how to i associate tasks to a specific group? I seem to 
miss this in the doc

Thank you!

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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