code: function(channel, next) {
      var filter = {
        channel_id : channel.id,
        owner_id : channel.owner_id
      },
      self = this,
      props = {
        last_poll : helper.nowUTCSeconds()
      }
  
      this._dao.updateColumn(
        'channel_pod_tracking',
        filter,
        props,
        function(err) {
          if (err) {
            self.log(err, 'error');
          }
          next(err, props.last_poll);
        }
        );
    }
docs: set last poll time