nerf invalidate perm

apps/permission/backends.py

@@ -1,7 +1,7 @@
 # Copyright (C) 2018-2024 by BDE ENS Paris-Saclay
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-from datetime import date
+from datetime import date, timedelta
 
 from django.contrib.auth.backends import ModelBackend
 from django.contrib.auth.models import User
@@ -106,6 +106,7 @@ class PermissionBackend(ModelBackend):
                 Q=Q,
                 now=timezone.now(),
                 today=date.today(),
+                week=timedelta(days=7),
             )
             yield permission