Provide explicit orderings to all models used in paginated queries

src/pretix/api/models.py

@@ -77,6 +77,9 @@ class WebHook(models.Model):
     all_events = models.BooleanField(default=True, verbose_name=_("All events (including newly created ones)"))
     limit_events = models.ManyToManyField('pretixbase.Event', verbose_name=_("Limit to events"), blank=True)
 
+    class Meta:
+        ordering = ('id',)
+
     @property
     def action_types(self):
         return [

src/pretix/base/models/auth.py

@@ -111,6 +111,7 @@ class User(AbstractBaseUser, PermissionsMixin, LoggingMixin):
     class Meta:
         verbose_name = _("User")
         verbose_name_plural = _("Users")
+        ordering = ('email',)
 
     def save(self, *args, **kwargs):
         self.email = self.email.lower()

src/pretix/base/models/tax.py

@@ -118,6 +118,9 @@ class TaxRule(LoggedModel):
     )
     custom_rules = models.TextField(blank=True, null=True)
 
+    class Meta:
+        ordering = ('event', 'rate', 'id')
+
     def allow_delete(self):
         from pretix.base.models.orders import OrderFee, OrderPosition
 

src/pretix/plugins/badges/models.py

@@ -52,3 +52,6 @@ class BadgeItem(models.Model):
                                 on_delete=models.CASCADE)
     layout = models.ForeignKey('BadgeLayout', on_delete=models.CASCADE, related_name='item_assignments',
                                null=True, blank=True)
+
+    class Meta:
+        ordering = ('id',)

src/pretix/plugins/banktransfer/models.py

@@ -21,6 +21,9 @@ class BankImportJob(models.Model):
     created = models.DateTimeField(auto_now_add=True)
     state = models.CharField(max_length=32, choices=STATES, default=STATE_PENDING)
 
+    class Meta:
+        ordering = ('id',)
+
     @property
     def owner_kwargs(self):
         if self.event:
@@ -76,3 +79,4 @@ class BankTransaction(models.Model):
 
     class Meta:
         unique_together = ('event', 'organizer', 'checksum')
+        ordering = ('date', 'id')

src/pretix/plugins/ticketoutputpdf/models.py

@@ -73,3 +73,4 @@ class TicketLayoutItem(models.Model):
 
     class Meta:
         unique_together = (('item', 'layout', 'sales_channel'),)
+        ordering = ("id",)