Remove deprecated auto_checkin_sales_channels (#4587)

* Remove deprecated auto_checkin_sales_channels

* Fix Query count

src/pretix/base/models/checkin.py

@@ -99,14 +99,6 @@ class CheckinList(LoggedModel):
         verbose_name=_('Automatically check out everyone at'),
         null=True, blank=True
     )
-    auto_checkin_sales_channels = models.ManyToManyField(
-        "SalesChannel",
-        verbose_name=_('Sales channels to automatically check in'),
-        help_text=_('This option is deprecated and will be removed in the next months. As a replacement, our new plugin '
-                    '"Auto check-in" can be used. When we remove this option, we will automatically migrate your event '
-                    'to use the new plugin.'),
-        blank=True,
-    )
     rules = models.JSONField(default=dict, blank=True)
 
     objects = ScopedManager(organizer='event__organizer')

src/pretix/base/models/event.py

@@ -1024,10 +1024,9 @@ class Event(EventMixin, LoggedModel):
 
         checkin_list_map = {}
         for cl in other.checkin_lists.filter(subevent__isnull=True).prefetch_related(
-            'limit_products', 'auto_checkin_sales_channels'
+            'limit_products'
         ):
             items = list(cl.limit_products.all())
-            auto_checkin_sales_channels = list(cl.auto_checkin_sales_channels.all())
             checkin_list_map[cl.pk] = cl
             cl.pk = None
             cl._prefetched_objects_cache = {}
@@ -1039,8 +1038,6 @@ class Event(EventMixin, LoggedModel):
             cl.log_action('pretix.object.cloned')
             for i in items:
                 cl.limit_products.add(item_map[i.pk])
-            if auto_checkin_sales_channels:
-                cl.auto_checkin_sales_channels.set(self.organizer.sales_channels.filter(identifier__in=[s.identifier for s in auto_checkin_sales_channels]))
 
         if other.seating_plan:
             if other.seating_plan.organizer_id == self.organizer_id: