M8-R04A: fix fake discovery receive clock

tests/test_meter_source_api.py

@@ -695,15 +695,16 @@ def test_real_warmtelink_discovery_waits_for_admission_and_keeps_its_serial_owne
 ):
     """A rejected candidate is neither a discovery success nor exposed metadata."""
     from app.integrations.p1 import dsmr_crc16
+    from app.services.warmtelink_ingest import WarmteLinkIngestor
     from app.services import warmtelink_worker
-    from app.services.warmtelink_worker import WarmteLinkWorkerManager
+    from app.services.warmtelink_worker import WarmteLinkWorker, WarmteLinkWorkerManager
 
     engine = create_engine(auth_database["app_url"], connect_args={"check_same_thread": False})
+    received_at = datetime(2026, 8, 22, 10, 0, 30, tzinfo=UTC)  # 12:00:30 Europe/Amsterdam.
     with Session(engine) as session:
-        now = datetime.now(UTC)
         source = MeterSource(
             name="Serial", kind="warmtelink_serial", enabled=True, config={"path": "/dev/fake"},
-            created_at=now, updated_at=now,
+            created_at=received_at, updated_at=received_at,
         )
         session.add(source)
         session.commit()
@@ -745,6 +746,12 @@ def test_real_warmtelink_discovery_waits_for_admission_and_keeps_its_serial_owne
     monkeypatch.setattr(warmtelink_worker, "_DISCOVERY_WAIT_SECONDS", 0.02)
     manager = WarmteLinkWorkerManager(
         session_factory=lambda: Session(engine), serial_factory=lambda _config: FakeReadOnlySerial(),
+        worker_factory=lambda source_id, config, **kwargs: WarmteLinkWorker(
+            source_id,
+            config,
+            ingestor=WarmteLinkIngestor(clock=lambda: received_at),
+            **kwargs,
+        ),
     )
     manager.reconcile()
     serial = FakeReadOnlySerial.instances[0]