code: def update_status(table_name="swdata", date_column="date"):
      
      status_text = 'Latest entry: {}'.format(
          _get_most_recent_record(table_name, date_column))
      L.info(status_text)
  
      scraperwiki.status('ok', status_text)
docs: Set the status endpoint on ScraperWiki to the latest entry e.g.
      'Latest entry: 2013-10-01'