Fix performance of check-in list API list

src/pretix/control/views/checkin.py

@@ -147,19 +147,9 @@ class CheckinListList(EventPermissionRequiredMixin, PaginationMixin, ListView):
         ctx = super().get_context_data(**kwargs)
         clists = list(ctx['checkinlists'])
 
-        # Optimization: Fetch expensive columns for this page only
-        annotations = {
-            a['pk']: a
-            for a in CheckinList.annotate_with_numbers(CheckinList.objects.filter(pk__in=[l.pk for l in clists]), self.request.event).values(
-                'pk', 'checkin_count', 'position_count', 'percent'
-            )
-        }
         for cl in clists:
             if cl.subevent:
                 cl.subevent.event = self.request.event  # re-use same event object to make sure settings are cached
-            cl.checkin_count = annotations.get(cl.pk, {}).get('checkin_count', 0)
-            cl.position_count = annotations.get(cl.pk, {}).get('position_count', 0)
-            cl.percent = annotations.get(cl.pk, {}).get('percent', 0)
         ctx['checkinlists'] = clists
         return ctx
 

src/pretix/control/views/dashboards.py

@@ -23,7 +23,6 @@ from pretix.base.models import (
     Item, Order, OrderPosition, OrderRefund, RequiredAction, SubEvent, Voucher,
     WaitingListEntry,
 )
-from pretix.base.models.checkin import CheckinList
 from pretix.base.timeline import timeline_for_event
 from pretix.control.forms.event import CommentForm
 from pretix.control.signals import (
@@ -227,8 +226,6 @@ def shop_state_widget(sender, **kwargs):
 def checkin_widget(sender, subevent=None, lazy=False, **kwargs):
     widgets = []
     qs = sender.checkin_lists.filter(subevent=subevent)
-    if not lazy:
-        qs = CheckinList.annotate_with_numbers(qs, sender)
     for cl in qs:
         widgets.append({
             'content': None if lazy else NUM_WIDGET.format(