code: public void deleteAll(Collection<TimelineEvent> events, TimelineUpdater timelineUpdater) {
          if (events != null && !events.isEmpty()) {
              for (TimelineEvent event : events) {
                  delete(event, timelineUpdater);
              }
          }
      }
docs: Deletes all given events in the model with UI update.
  
  @param events          collection of events to be deleted
  @param timelineUpdater TimelineUpdater instance to delete the events in UI