introduce duplicity checks when updating a Racer or a Team object in DB

src/main/java/de/pnreichmuth/timekeep_backend/services/RacerService.java

@@ -71,4 +71,9 @@ public class RacerService {
         Racer racer = racerRepository.findById(id).orElse(null);
         if(racer == null) throw new RacerNotFoundException("Racer not found");
     }
+
+    public void updateRacer(Racer racer) throws RacerExistsException{
+        checkRacerIsDuplicate(racer);
+        racerRepository.save(racer);
+    }
 }

src/main/java/de/pnreichmuth/timekeep_backend/services/TeamService.java

@@ -70,7 +70,6 @@ public class TeamService {
     public void updateTeam(Team team) throws TeamNotFoundException {
         Objects.requireNonNull(team, "Can't update null team.");
         checkTeamIsDuplicate(team);
-        racerRepository.saveAll(team.getMembers().values());
         teamRepository.save(team);
     }
     /**