Debug reset: put the whole request in a transaction.

django_etebase/views.py

@@ -778,6 +778,7 @@ class TestAuthenticationViewSet(viewsets.ViewSet):
         if not settings.DEBUG:
             return HttpResponseBadRequest("Only allowed in debug mode.")
 
+        with transaction.atomic():
             user = get_object_or_404(User.objects.all(), username=request.data.get('user').get('username'))
 
             # Only allow test users for extra safety