docs: public boolean scheduleNotification(ScheduledNotification notification, List<String> message,
                                          Collection<Recipient> recipients) {
          if (notification.getIen() > 0) {
              deleteScheduledNotification(notification);
          }
  
          String extraInfo = StrUtil.fromList(Arrays.asList(notification.getExtraInfo()), StrUtil.U);
          return broker.callRPCBool("RGCWXQ SCHALR", notification.getDeliveryDate(), scheduledPrefix,
              notification.getSubject(), extraInfo, message, prepareRecipients(recipients));
      }