new_contents: from celery.schedules import crontab
  from celery.task import periodic_task
  from casexml.apps.phone.cleanliness import set_cleanliness_flags_for_enabled_domains
  
  
  @periodic_task(run_every=crontab(hour="2", minute="0", day_of_week="1"),
                 queue='background_queue')
  def update_cleanliness_flags():
      """
      Once a week go through all cleanliness flags and see if any dirty ones have become clean
      """
      set_cleanliness_flags_for_enabled_domains(force_full=False)
  
  
  @periodic_task(run_every=crontab(hour="4", minute="0", day_of_month="5"),
                 queue='background_queue')
  def force_update_cleanliness_flags():
      """
      Once a month, go through all cleanliness flags without using hints
      """
      # the only reason this task is run is to use the soft_assert to validate
      # that there are no bugs in the weekly task.
      # If we haven't seen any issues by the end of 2015 (so 6 runs) we should remove this.
      set_cleanliness_flags_for_enabled_domains(force_full=True)
  
subject: add jobs to set cleanliness flags on a schedule