ResponseEntity removeContact(RemovePhonebookEntryRequest request) {
        if (request.getTypes().isEmpty()) {
            request.setTypes(Arrays.asList(PhonebookAssignment.Type.values()));
        }

        List<PhonebookAssignment> phonebookAssignments = assignmentRepository.getPhonebookAssignments(request.getId());
        phonebookAssignments.stream()
                .filter(assignment -> request.getTypes().contains(assignment.getType()))
                .forEach(assignmentRepository::delete);
        phonebookAssignments = assignmentRepository.getPhonebookAssignments(request.getId());
        if (phonebookAssignments.size() == 0 && repository.existsById(request.getId())) {
            repository.deleteById(request.getId());
        }

        return ResponseEntity.ok(null);
    }