@Override
 public void removeVotes(String username) {
   User user = userPersistence.findByUsername(username);
   votingPersistence.removeVotes(user);
   String auditMessage = "%s hat sein Voting widerrufen";
   auditPersistence.createAudit(username, String.format(auditMessage, username));
 }
  @Override
  public void save(String username, List<Vote> votes) {
    Event event = eventPersistence.findLatestVoting();
    Date timestamp = new Date();

    for (Vote vote : votes) {
      User user = userPersistence.findByUsername(username);
      Location location = locationPersistence.findById(vote.getLocation().getId());
      Vote loadedVote = votingPersistence.findLatestVote(user, location);

      if (loadedVote != null) {
        loadedVote.setCurrent(false);
        votingPersistence.save(loadedVote);
      }

      Integer newVoteValue = vote.getVote();
      if (newVoteValue == null) {
        newVoteValue = 0;
      }

      Vote voteToSave = new Vote();
      voteToSave.setLocation(location);
      voteToSave.setUser(user);
      voteToSave.setDate(timestamp);
      voteToSave.setVote(newVoteValue);
      voteToSave.setCurrent(true);

      String auditMessage = "%s hat sein Voting für %s auf %d gesetzt";
      if (voteToSave.getVote() > 0) {
        auditPersistence.createAudit(
            username,
            String.format(auditMessage, username, location.getName(), voteToSave.getVote()));
      }

      voteToSave.setEvent(event);

      votingPersistence.save(voteToSave);
    }
  }