feat(tplus): 新增 T+ 只读同步服务与同步管理

backend/tests/integration/test_settlements.py

@@ -487,8 +487,18 @@ class TestManagerAggregate:
         assert len([i for i in out["items"] if i["calc_type"] == 2]) == 1
         assert len([i for i in out["items"] if i["calc_type"] == 1]) == 1
 
-    def test_月末取参_预约变更影响本月聚合(self, client: TestClient, admin: dict) -> None:
+    def test_月末取参_预约变更影响本月聚合(
+        self, client: TestClient, admin: dict, monkeypatch: pytest.MonkeyPatch
+    ) -> None:
         """取参锚点=所属月月末：10-25 生效的预约变更应影响 2026-10 月结。"""
+
+        class ScenarioDate(date):
+            @classmethod
+            def today(cls):
+                return cls(2026, 10, 20)
+
+        # 固定预约场景的申请日，避免现实日期超过 10-25 后误测成“禁止追溯修改”。
+        monkeypatch.setattr("app.services.param_service.date", ScenarioDate)
         resp = client.post(
             "/api/v1/system/params/changes",
             json={