Check-in API: Improve handling of unknown ticket codes

src/pretix/base/services/checkin.py

@@ -567,7 +567,7 @@ def _save_answers(op, answers, given_answers):
 def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict, force=False,
                     ignore_unpaid=False, nonce=None, datetime=None, questions_supported=True,
                     user=None, auth=None, canceled_supported=False, type=Checkin.TYPE_ENTRY,
-                    raw_barcode=None):
+                    raw_barcode=None, from_revoked_secret=False):
     """
     Create a checkin for this particular order position and check-in list. Fails with CheckInError if the check in is
     not valid at this time.
@@ -669,7 +669,7 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
                 device=device,
                 gate=device.gate if device else None,
                 nonce=nonce,
-                forced=force and not entry_allowed,
+                forced=force and (not entry_allowed or from_revoked_secret),
                 raw_barcode=raw_barcode,
             )
             op.order.log_action('pretix.event.checkin', data={

src/pretix/base/services/seating.py

@@ -45,7 +45,7 @@ def validate_plan_change(event, subevent, plan):
                 seat=OuterRef('pk'),
                 canceled=False,
             ).exclude(
-                order__status=Order.STATUS_CANCELED
+                order__status=(Order.STATUS_CANCELED, Order.STATUS_EXPIRED)
             ))
         ).annotate(has_v=Count('vouchers')).filter(
             subevent=subevent,