$history{ $+{ ticket } }{ $entry->{ action } } = {
                                     date  => $words[0],
                                    'time' => $words[1],
  ( exists ( $+{ order } ) ? (       order => $+{ order } ) : () ),
  ( exists ( $+{ invoice } ) ? (   invoice => $+{ invoice } ) : () ),
  ( exists ( $+{ shipment } ) ? ( shipment => $+{ shipment } ) : () ),
  ( exists ( $+{ scheduled_date } ) ? (
                            scheduled_date => $+{ scheduled_date } ) : () ),
  ( exists ( $+{ status } ) ? (     status => $+{ status } ) : () ),
};