fix: remove unnecessary comments

    ipv4_address = None

    if device_target.ipv4:

        # Sessions created before ipv4_port/ipv4_private were sent still hold only the bare

        # address, so the reconstruction can still fall short of DeviceIpv4Addr's "publicAddress

        # + one of private/port" rule. model_construct bypasses that validator, which exists to

        # constrain client input, not this internal reconstruction. Device.model_construct is

        # required alongside it: pydantic revalidates nested model fields against their own

        # validators even when a pre-built instance is passed in, so the bypass has to hold at

        # every level enclosing a potentially incomplete address.

        ipv4_address = DeviceIpv4Addr.model_construct(

            publicAddress=device_target.ipv4,

            privateAddress=device_target.ipv4_private,

        app_provider_id: str,

        x_correlator: Optional[str] = None,

    ) -> Location:

        # CAMARA makes `device` optional only because a three-legged token identifies the

        # subject on its own. OEG has no JWT subject extraction yet (see

        # dependencies.get_caller_context), so every call is effectively two-legged and the

        # device must be supplied. UNNECESSARY_IDENTIFIER -- the mirror error, for a device

        # sent alongside a three-legged token -- is therefore unreachable until that lands.

        if request.device is None:

            raise UnprocessableEntityException(

                error_code=ErrorCode.MISSING_IDENTIFIER,

                message="The device cannot be identified.",

            )

        # One value for both surfaces. The router always supplies the caller context's

        # correlator, but a direct call with None must not put a generated id in the body and

        # nothing in the header -- that is the divergence this fallback exists to close.

        correlation_id = x_correlator or str(uuid4())

        query = build_location_query(

            request=request,

    request: Request,

    x_correlator: XCorrelatorHeader = None,

) -> CallerContext:

    # `x_correlator` stays declared so FastAPI still validates the header against CAMARA's

    # pattern and documents it; the value comes from x_correlator_header, which generates and

    # caches one when the caller sent none, so every surface reports the same id.

    return CallerContext(

        x_correlator=x_correlator_header(request),

        tenant_id="placeholder",  # TODO: extract from JWT

        self, client: TestClient, mock_eam_service: AsyncMock

    ) -> None:

        client.get(f"{EAM_BASE}/edge-cloud-zones?region=eu-west&status=active")

        # x_correlator is never None: when the caller sends no header OEG generates one at the

        # edge and uses that single value downstream and in the response (REQ-OEG-13).

        kwargs = mock_eam_service.get_edge_cloud_zones.call_args.kwargs

        assert kwargs["region"] == "eu-west"

        assert kwargs["status"] == "active"

    def test_generated_correlation_id_is_the_one_the_caller_is_given(

        self, api_client: TestClient, fake_bus: FakeDataBus

    ) -> None:

        """Same invariant as EAM and Location Retrieval: when the caller sends no

        x-correlator, the id OEG generates must reach SRM and come back to the caller as one

        value (oeg/architecture.md REQ-OEG-13)."""

        response = api_client.post(f"{QOD_BASE}/sessions", json=SESSION_BODY)

        _, command = fake_bus.published[0]

        assert command.network_capability.parameters.duration_seconds == 3600

        assert command.network_capability.target.application_server.ipv4 == "192.168.0.1"

        assert command.network_capability.target.device.ipv4 == "84.125.93.10"

        # The NAT'd public address alone names thousands of subscribers; the port is what

        # picks out this device, so dropping it would leave SRM unable to resolve the target.

        assert command.network_capability.target.device.ipv4_port == 59765

        assert command.source == "nbi_camara"