FInal bank, stripe and paypal sandbox completed

backend/igny8_core/auth/models.py

@@ -227,6 +227,8 @@ class Account(SoftDeletableModel):
             # Core (last due to dependencies)
             'sector_set',
             'site_set',
+            # Users (delete after sites to avoid FK issues, owner is SET_NULL)
+            'users',
             # Subscription (OneToOne)
             'subscription',
         ]
@@ -285,6 +287,12 @@ class Account(SoftDeletableModel):
             from django.core.exceptions import PermissionDenied
             raise PermissionDenied("System account cannot be deleted.")
         
+        # Clear owner reference first to avoid FK constraint issues
+        # (owner is SET_NULL but we're deleting the user who is the owner)
+        if self.owner:
+            self.owner = None
+            self.save(update_fields=['owner'])
+        
         # Cascade hard-delete all related objects first
         self._cascade_delete_related(hard_delete=True)