diff --git a/routes/taiga_routes.py b/routes/taiga_routes.py
index e8e5ca5..56de6c9 100644
--- a/routes/taiga_routes.py
+++ b/routes/taiga_routes.py
@@ -72,6 +72,15 @@ def taiga_webhook():
             collection_name, delete_key, id, result.deleted_count
         )
 
+        # When a user story is deleted, also remove all its associated tasks
+        if event_type == "userstory":
+            tasks_coll = get_collection(f"taiga_{prj}.tasks")
+            task_result = tasks_coll.delete_many({"userstory_id": id})
+            logger.info(
+                "Cascade-deleted %s task(s) linked to userstory_id=%s in taiga_%s.tasks",
+                task_result.deleted_count, id, prj,
+            )
+
         author_login = raw_payload.get("by", {}).get("username", "unknown")
         logger.info(
             "Notifying LD_EVAL about deleted event: %s for team with external_id: %s with quality_model: %s",
@@ -81,6 +90,9 @@ def taiga_webhook():
         )
         try:
             notify_eval_push(event_type, prj, author_login, quality_model)
+            # Force a task re-eval when tasks were cascade-deleted with the user story
+            if event_type == "userstory":
+                notify_eval_push("task", prj, author_login, quality_model)
         except Exception as e:
             logger.error("Error notifying LD_EVAL: %s", e)
             return jsonify({"error": "Failed to notify LD_EVAL"}), 500
diff --git a/tests/test_taiga_routes.py b/tests/test_taiga_routes.py
index d0b67d2..15486fd 100644
--- a/tests/test_taiga_routes.py
+++ b/tests/test_taiga_routes.py
@@ -105,6 +105,43 @@ def test_delete_action(self, mock_verify, mock_coll, mock_notify, client):
         mock_collection.delete_one.assert_called_once_with({"task_id": 99})
         mock_notify.assert_called_once_with("task", "P", "u", None)
 
+    @patch("routes.taiga_routes.notify_eval_push")
+    @patch("routes.taiga_routes.get_collection")
+    @patch("routes.taiga_routes.verify_taiga_signature", return_value=True)
+    def test_delete_userstory_cascades_tasks(
+        self, mock_verify, mock_coll, mock_notify, client
+    ):
+        payload = {
+            "type": "userstory",
+            "action": "delete",
+            "data": {"id": 55, "project": {"name": "P"}},
+            "by": {"username": "u"},
+        }
+        mock_us_collection = MagicMock()
+        mock_tasks_collection = MagicMock()
+
+        def side_effect(name):
+            if name == "taiga_P.userstories":
+                return mock_us_collection
+            if name == "taiga_P.tasks":
+                return mock_tasks_collection
+            return MagicMock()
+
+        mock_coll.side_effect = side_effect
+
+        resp = client.post(
+            "/webhook/taiga?prj=P",
+            data=json.dumps(payload),
+            content_type="application/json",
+            headers={"X-TAIGA-WEBHOOK-SIGNATURE": "x"},
+        )
+        assert resp.status_code == 200
+        mock_us_collection.delete_one.assert_called_once_with({"userstory_id": 55})
+        mock_tasks_collection.delete_many.assert_called_once_with({"userstory_id": 55})
+        assert mock_notify.call_count == 2
+        mock_notify.assert_any_call("userstory", "P", "u", None)
+        mock_notify.assert_any_call("task", "P", "u", None)
+
     @patch("routes.taiga_routes.get_collection")
     @patch("routes.taiga_routes.verify_taiga_signature", return_value=True)
     def test_delete_no_id_returns_400(self, mock_verify, mock_coll, client):