@RequestBody String username) {
String sanitizedUsername = UserController.sanitize(username);
User user = new User(sanitizedUsername, LocalDateTime.now(), false);
+
+ // Ein Fehler wegen doppeltem username verhindert das Speichern
repository.save(user);
+ user = repository.findByUsername(sanitizedUsername);
+
UriComponents uri =
builder
.fromCurrentRequest()