fixes on club group attribution

club/migrations/0012_club_board_group_club_members_group.py

@@ -1,6 +1,7 @@
 # Generated by Django 4.2.16 on 2024-11-20 17:08
 
 import django.db.models.deletion
+import django.db.models.functions.datetime
 from django.conf import settings
 from django.db import migrations, models
 from django.db.migrations.state import StateApps
@@ -106,4 +107,11 @@ class Migration(migrations.Migration):
                 to="core.group",
             ),
         ),
+        migrations.AddConstraint(
+            model_name="membership",
+            constraint=models.CheckConstraint(
+                check=models.Q(("end_date__gte", models.F("start_date"))),
+                name="end_after_start",
+            ),
+        ),
     ]