fix remove older events

src/main/java/ru/ulstu/timeline/service/EventService.java

@@ -17,6 +17,8 @@ import ru.ulstu.user.model.UserDto;
 import ru.ulstu.user.service.UserService;
 
 import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
 import java.util.Date;
 import java.util.List;
 import java.util.stream.Collectors;
@@ -103,9 +105,13 @@ public class EventService {
     }
 
     public void createFromPaper(Paper newPaper) {
+        createFromPaper(newPaper, Collections.emptyList());
+    }
+
+    public void createFromPaper(Paper newPaper, List<Event> events) {
         List<Timeline> timelines = timelineService.findAll();
         Timeline timeline = timelines.isEmpty() ? new Timeline() : timelines.get(0);
-        timeline.getEvents().removeAll(newPaper.getEvents());
+        timeline.getEvents().removeAll(events);
         for (Deadline deadline : newPaper.getDeadlines()
                 .stream()
                 .filter(d -> d.getDate().after(new Date()) || DateUtils.isSameDay(d.getDate(), new Date()))
@@ -125,8 +131,9 @@ public class EventService {
     }
 
     public void updatePaperDeadlines(Paper paper) {
-        eventRepository.delete(eventRepository.findAllByPaper(paper));
+        List<Event> foundEvents = eventRepository.findAllByPaper(paper);
-        createFromPaper(paper);
+        eventRepository.delete(foundEvents);
+        createFromPaper(paper, foundEvents);
     }
 
     public List<Event> findByCurrentDate() {