code: function(channel, next) {
      var filter = {
        channel_id : channel.id,
        owner_id : channel.owner_id
      };
  
      this._dao.findFilter('channel_pod_tracking', filter, function(err, result) {
        next(err || !result, result && result.length > 0 ? result[0].last_poll : null);
      });
    }
docs: get last poll time for tracker