API: Make all mutating endpoints transactional (#6430)

All of our API endpoints that do something in the system do at least two
SQL queries, one for the actual change and one for the log entry. Often
many more. We want all of this to happen in a transaction so we know an
API call was executed or not at all, not half-way.

src/pretix/plugins/sendmail/api.py

@@ -20,6 +20,7 @@
 # <https://www.gnu.org/licenses/>.
 #
 from django.core.exceptions import ValidationError
+from django.db import transaction
 from django_filters.rest_framework import DjangoFilterBackend, FilterSet
 from django_scopes import scopes_disabled
 from rest_framework import viewsets
@@ -118,6 +119,7 @@ class RuleViewSet(viewsets.ModelViewSet):
     def get_queryset(self):
         return Rule.objects.filter(event=self.request.event)
 
+    @transaction.atomic()
     def perform_create(self, serializer):
         super().perform_create(serializer)
         serializer.instance.log_action(
@@ -128,6 +130,7 @@ class RuleViewSet(viewsets.ModelViewSet):
 
         )
 
+    @transaction.atomic()
     def perform_update(self, serializer):
         super().perform_update(serializer)
         serializer.instance.log_action(
@@ -137,6 +140,7 @@ class RuleViewSet(viewsets.ModelViewSet):
             data=self.request.data
         )
 
+    @transaction.atomic()
     def perform_destroy(self, instance):
         instance.log_action(
             'pretix.plugins.sendmail.rule.deleted',