fix: Skip default admin@local.host creation during container startup if an admin user already exists

backend/apps/users/management/commands/create_admin.py

@@ -13,6 +13,12 @@ class Command(BaseCommand):
         parser.add_argument('--password', type=str, default=os.getenv('ADMIN_PASSWORD', 'adminpassword'), help='Passwort für den Admin')
 
     def handle(self, *args, **options):
+        has_existing_admin = User.objects.filter(is_superuser=True).exists() or User.objects.filter(is_admin_user=True).exists()
+        explicit_env_set = bool(os.getenv('ADMIN_USERNAME') or os.getenv('ADMIN_EMAIL'))
+
+        if has_existing_admin and not explicit_env_set and not os.getenv('FORCE_CREATE_ADMIN'):
+            self.stdout.write(self.style.SUCCESS("ℹ️ Mindestens ein Admin-Benutzer existiert bereits. Es wurde kein neuer Standard-Admin ('admin@local.host') erstellt."))
+        else:
             username = options['username'] or os.getenv('ADMIN_USERNAME', 'admin')
             email = options['email'] or os.getenv('ADMIN_EMAIL', 'admin@local.host')
             password = options['password'] or os.getenv('ADMIN_PASSWORD', 'adminpassword')