fix: delete inactive stock alerts to prevent uniqueness constraint violations during updates

loko/stock/models.py

@@ -1233,6 +1233,10 @@ def update_stock_alerts(product, warehouse):
                 current_quantity=total,
             )
     elif alert:
+        # Supprimer les anciennes alertes inactives pour ce produit/entrepôt afin d'éviter la violation d'unicité
+        StockAlert.objects.filter(
+            product=product, warehouse=warehouse, is_active=False
+        ).exclude(pk=alert.pk).delete()
         alert.current_quantity = total
         alert.is_active = False
         alert.resolved_at = timezone.now()