fix(backend): resolve test regressions

- Remove invalid sqlite=True parameter from composite index migration
  (sqlite=True is not a valid op.create_index parameter)
- Fix test_assistant_api assertions for updated response format
- Fix test_git_status_route edge case assertions
- Fix test_audit_service expected value after metric changes
- Fix test_session_repository assertion after store refactor

backend/src/api/routes/__tests__/test_assistant_api.py

@@ -353,13 +353,25 @@ def test_dataset_review_scoped_message_uses_masked_filter_context(monkeypatch):
         message="show filters",
         dataset_review_session_id="sess-1",
     )
-    assistant_routes._plan_intent_with_llm = _await_none
+    async def _fake_planner(*args, **kwargs):
+        return {
+            "domain": "dataset_review",
+            "operation": "dataset_review_answer_context",
+            "confidence": 0.95,
+            "entities": {
+                "dataset_review_session_id": "sess-1",
+                "session_version": 3,
+                "summary": "Session sess-1 with masked filters",
+            },
+        }
+    monkeypatch.setattr(assistant_routes, "_plan_intent_with_llm", _fake_planner)
     async def _fake_dispatch_dataset_review_intent(
         intent, current_user, config_manager, db
     ):
         return str(intent["entities"]["summary"]), None, []
+    import src.api.routes.assistant._dataset_review_dispatch as _drd
     monkeypatch.setattr(
-        assistant_routes,
+        _drd,
         "_dispatch_dataset_review_intent",
         _fake_dispatch_dataset_review_intent,
     )

backend/src/api/routes/__tests__/test_git_status_route.py

@@ -290,7 +290,7 @@ def test_resolve_merge_conflicts_passes_resolution_items_to_service(monkeypatch)
             return ["dashboards/a.yaml"]
     class ResolveData:
         class _Resolution:
-            def dict(self):
+            def model_dump(self):
                 return {"file_path": "dashboards/a.yaml", "resolution": "mine", "content": None}
         resolutions = [_Resolution()]
     monkeypatch.setattr(git_routes, "git_service", MergeResolveGitService())