M8-T10: add WarmteLink serial worker manager

tests/test_meter_source_api.py

@@ -79,6 +79,44 @@ def test_source_profiles_and_crud_mask_secrets(auth_database):
     engine.dispose()
 
 
+def test_serial_source_reconciles_only_after_commit(auth_database, monkeypatch):
+    """Creation and mutation trigger the worker manager after a successful commit."""
+    from app.api.routes.api import meter_sources
+
+    calls = []
+    monkeypatch.setattr(meter_sources.warmtelink_worker_manager, "reconcile", lambda: calls.append(True))
+    client, engine = _client(auth_database)
+    with client:
+        _login(client)
+        baseline = len(calls)
+        response = client.post("/api/energy/sources", headers={"X-CSRF-Token": _CSRF}, json={
+            "name": "Serial", "kind": "warmtelink_serial", "config": {"path": "/dev/ttyUSB0"},
+        })
+        assert response.status_code == 201
+        source_uuid = response.json()["uuid"]
+        assert len(calls) == baseline + 1
+        assert client.patch(f"/api/energy/sources/{source_uuid}", headers={"X-CSRF-Token": _CSRF}, json={"enabled": False}).status_code == 200
+        assert len(calls) == baseline + 2
+    engine.dispose()
+
+
+def test_serial_source_commit_is_not_reported_as_failed_when_reconcile_raises(auth_database, monkeypatch):
+    from app.api.routes.api import meter_sources
+
+    client, engine = _client(auth_database)
+    with client:
+        _login(client)
+        monkeypatch.setattr(
+            meter_sources.warmtelink_worker_manager, "reconcile",
+            lambda: (_ for _ in ()).throw(RuntimeError()),
+        )
+        response = client.post("/api/energy/sources", headers={"X-CSRF-Token": _CSRF}, json={
+            "name": "Serial", "kind": "warmtelink_serial", "config": {"path": "/dev/ttyUSB0"},
+        })
+        assert response.status_code == 201
+    engine.dispose()
+
+
 def test_binding_routes_and_atomic_meter_declaration(auth_database):
     client, engine = _client(auth_database)
     with client: