new_contents: from regscrape_lib.util import get_db
  import settings
  
  def run():
      query = settings.FILTER.copy()
      query['_job_id'] = {'$exists': True}
      
      db = get_db()
      db.docs.update(query, {'$unset': {'_job_id': True}}, multi=True, safe=True)
      
      print 'Canceled all currently-assigned jobs.'
  
subject: Add command to cancel existing jobs to make it easier to resume failed scrapes.