expose: buy/sell_price_now follow the live dual-tariff slot

Subscribe the separate DSMR tariff topic (dsmr/meter-stats/electricity_tariff,
1=dal/off-peak, 2=normal/peak), keep the latest slot in memory, and make the
manual-contract buy/sell_price_now sensors show the matching tariff's price
(tariff 1 -> dal, 2/unknown -> normal). Tibber (single 15-min price) unchanged.
Billing is untouched (register-split already handles tariffs correctly).

- new config dsmr_tariff_topic; subscribe managed by apply_dsmr_subscription
  (restart-free on config save). In-memory tariff is lock-guarded.
- import_cost_total / export_revenue_total cumulative getters unchanged.

.env.example

@@ -52,6 +52,9 @@ HA_DISCOVERY_PREFIX=homeassistant
 # DSMR_INGEST_ENABLED=false
 # DSMR_MQTT_TOPIC=dsmr/json
 # DSMR_SAMPLE_INTERVAL_S=10
+# DSMR tariff topic: publishes "1" (dal/off-peak) or "2" (normal/peak).
+# Empty string disables tariff-aware pricing (buy/sell_price_now always show normal rate).
+# DSMR_TARIFF_TOPIC=dsmr/meter-stats/electricity_tariff
 
 # Optional: Tibber dynamic pricing credentials (M6).
 # Only used when an active energy contract with kind=tibber is configured.

app/config.py

@@ -63,6 +63,9 @@ class Settings(BaseSettings):
     dsmr_ingest_enabled: bool = False
     dsmr_mqtt_topic: str = "dsmr/json"
     dsmr_sample_interval_s: int = 10
+    # DSMR dual-tariff topic: publishes "1" (dal/off-peak) or "2" (normal/peak).
+    # Empty string = do not subscribe (tariff-aware pricing disabled).
+    dsmr_tariff_topic: str = "dsmr/meter-stats/electricity_tariff"
 
     # Tibber dynamic pricing credentials (M6; only used when active contract kind=tibber).
     tibber_api_token: str = ""

app/integrations/expose.py

@@ -449,9 +449,21 @@ def _energy_cost_provider(session: Session) -> list[ExposableEntity]:
     # --- value_getter: current buy price ---
 
     def _make_buy_price_getter() -> Callable[["Session"], Any]:
-        """Return a getter for the current buy price per kWh."""
+        """Return a getter for the current buy price per kWh.
+
+        For ``kind="manual"`` contracts the getter selects the price slot that
+        matches the current DSMR electricity tariff:
+
+        - tariff == 1 (dal / off-peak)  → ``buy_dal``
+        - tariff == 2 (normal / peak)   → ``buy_normal``
+        - tariff is None / unknown       → ``buy_normal`` (safe fallback = current status quo)
+
+        For ``kind="tibber"`` (hourly dynamic pricing) the tariff slot is not
+        applicable; the getter always uses the ``buy`` key from the snapshot.
+        """
         def _getter(sess: "Session") -> Any:
             from app.models.energy import EnergyCostPeriod as _ECP
+            from app.services.dsmr_ingest import get_current_tariff
 
             period = (
                 sess.query(_ECP)
@@ -466,7 +478,12 @@ def _energy_cost_provider(session: Session) -> list[ExposableEntity]:
             if kind == "tibber":
                 raw = snap.get("buy")
             elif kind == "manual":
-                raw = snap.get("buy_normal")
+                tariff = get_current_tariff()
+                if tariff == 1:
+                    raw = snap.get("buy_dal")
+                else:
+                    # tariff == 2, None, or any unexpected value → normal (peak) rate.
+                    raw = snap.get("buy_normal")
             else:
                 # Unknown kind — attempt common keys gracefully.
                 raw = snap.get("buy") or snap.get("buy_normal")
@@ -482,9 +499,20 @@ def _energy_cost_provider(session: Session) -> list[ExposableEntity]:
     # --- value_getter: current sell price ---
 
     def _make_sell_price_getter() -> Callable[["Session"], Any]:
-        """Return a getter for the current sell price per kWh."""
+        """Return a getter for the current sell price per kWh.
+
+        For ``kind="manual"`` contracts the getter selects the price slot that
+        matches the current DSMR electricity tariff:
+
+        - tariff == 1 (dal / off-peak)  → ``sell_dal``
+        - tariff == 2 (normal / peak)   → ``sell_normal``
+        - tariff is None / unknown       → ``sell_normal`` (safe fallback = current status quo)
+
+        For ``kind="tibber"`` the tariff slot is not applicable; always uses ``sell``.
+        """
         def _getter(sess: "Session") -> Any:
             from app.models.energy import EnergyCostPeriod as _ECP
+            from app.services.dsmr_ingest import get_current_tariff
 
             period = (
                 sess.query(_ECP)
@@ -499,7 +527,12 @@ def _energy_cost_provider(session: Session) -> list[ExposableEntity]:
             if kind == "tibber":
                 raw = snap.get("sell")
             elif kind == "manual":
-                raw = snap.get("sell_normal")
+                tariff = get_current_tariff()
+                if tariff == 1:
+                    raw = snap.get("sell_dal")
+                else:
+                    # tariff == 2, None, or any unexpected value → normal (peak) rate.
+                    raw = snap.get("sell_normal")
             else:
                 raw = snap.get("sell") or snap.get("sell_normal")
             if raw is None:

app/services/config_page.py

@@ -138,6 +138,12 @@ CONFIG_FIELDS: tuple[ConfigField, ...] = (
         "DSMR Sample Interval (s)",
         input_type="number",
     ),
+    ConfigField(
+        "DSMR",
+        "DSMR_TARIFF_TOPIC",
+        "dsmr_tariff_topic",
+        "DSMR Tariff Topic",
+    ),
     ConfigField(
         "Tibber",
         "TIBBER_API_TOKEN",
@@ -348,6 +354,7 @@ def _settings_payload(settings: Settings) -> dict[str, Any]:
         "dsmr_ingest_enabled": settings.dsmr_ingest_enabled,
         "dsmr_mqtt_topic": settings.dsmr_mqtt_topic,
         "dsmr_sample_interval_s": settings.dsmr_sample_interval_s,
+        "dsmr_tariff_topic": settings.dsmr_tariff_topic,
         "tibber_api_token": settings.tibber_api_token,
         "tibber_home_id": settings.tibber_home_id,
     }

app/services/dsmr_ingest.py

@@ -32,6 +32,7 @@ from __future__ import annotations
 
 import json
 import logging
+import threading
 from datetime import datetime, timezone
 from typing import TYPE_CHECKING
 
@@ -51,17 +52,81 @@ logger = logging.getLogger(__name__)
 # change can unsubscribe the old topic before subscribing the new one.
 _current_dsmr_topic: str | None = None
 
+# Tracks the DSMR tariff topic currently subscribed via the MQTT manager.
+_current_tariff_topic: str | None = None
+
+# Current electricity tariff: 1 = dal/off-peak, 2 = normal/peak.
+# Written by the paho network thread, read by the publish job — guarded by a lock.
+_current_tariff: int | None = None
+_tariff_lock = threading.Lock()
+
+
+def get_current_tariff() -> int | None:
+    """Return the most recently received electricity tariff (1 or 2), or None."""
+    with _tariff_lock:
+        return _current_tariff
+
+
+def set_current_tariff(value: int | None) -> None:
+    """Set the current electricity tariff (1 or 2), or clear it with None."""
+    with _tariff_lock:
+        global _current_tariff
+        _current_tariff = value
+
+
+def handle_tariff_message(payload_bytes: bytes) -> None:
+    """Parse one DSMR tariff MQTT payload and update the in-memory tariff state.
+
+    Called from the paho network thread; *must* swallow all exceptions so that
+    a bad payload never crashes the loop or drops the broker connection.
+
+    Accepts payload as bytes or str (paho can deliver either).  Ignores
+    whitespace.  Only accepts integer values 1 or 2; anything else is discarded
+    and the previous known tariff is preserved.
+
+    Parameters
+    ----------
+    payload_bytes:
+        Raw bytes from the MQTT message (may also be a str in some paho versions).
+    """
+    try:
+        # Decode bytes → str if needed; strip surrounding whitespace.
+        if isinstance(payload_bytes, (bytes, bytearray)):
+            raw = payload_bytes.decode("utf-8", errors="replace").strip()
+        else:
+            raw = str(payload_bytes).strip()
+
+        value = int(raw)
+        if value not in (1, 2):
+            logger.debug(
+                "dsmr_ingest.handle_tariff_message: unexpected tariff value %d (expected 1 or 2, ignored).",
+                value,
+            )
+            return
+
+        set_current_tariff(value)
+        logger.debug("dsmr_ingest.handle_tariff_message: tariff updated to %d.", value)
+
+    except Exception:
+        # Malformed payload (e.g. non-numeric); swallow silently to protect network thread.
+        logger.debug(
+            "dsmr_ingest.handle_tariff_message: could not parse payload %r (ignored).",
+            payload_bytes,
+        )
+
 
 def apply_dsmr_subscription(settings: "Settings") -> None:
-    """(Re)apply the DSMR MQTT subscription to match *settings* — restart-free.
+    """(Re)apply the DSMR MQTT subscriptions to match *settings* — restart-free.
 
     Call this at startup and after every config save.  It makes the live MQTT
-    subscription reflect the current ``dsmr_ingest_enabled`` / ``dsmr_mqtt_topic``
+    subscriptions reflect the current ``dsmr_ingest_enabled`` / ``dsmr_mqtt_topic``
-    / ``dsmr_sample_interval_s`` settings without an app restart:
+    / ``dsmr_sample_interval_s`` / ``dsmr_tariff_topic`` settings without an app
+    restart:
 
-    - **Disabled** → unsubscribe any active DSMR subscription.
+    - **Disabled** → unsubscribe any active DSMR and tariff subscriptions.
     - **Enabled** → (re)subscribe to ``dsmr_mqtt_topic`` with a handler bound to
       a *fresh* settings snapshot, so a changed sample interval also takes effect.
+      Also subscribe to ``dsmr_tariff_topic`` when non-empty.
     - **Topic changed** → unsubscribe the old topic before subscribing the new one.
 
     Idempotent and safe to call when MQTT is not connected (the subscription is
@@ -70,15 +135,23 @@ def apply_dsmr_subscription(settings: "Settings") -> None:
     # Imported here (not at module top) to avoid a circular import at app start.
     from app.integrations.mqtt import mqtt_manager
 
-    global _current_dsmr_topic
+    global _current_dsmr_topic, _current_tariff_topic
 
     if not settings.dsmr_ingest_enabled:
         if _current_dsmr_topic is not None:
             mqtt_manager.unsubscribe(_current_dsmr_topic)
             logger.info("DSMR ingest disabled — unsubscribed from topic=%s.", _current_dsmr_topic)
             _current_dsmr_topic = None
+        if _current_tariff_topic is not None:
+            mqtt_manager.unsubscribe(_current_tariff_topic)
+            logger.info(
+                "DSMR ingest disabled — unsubscribed from tariff topic=%s.",
+                _current_tariff_topic,
+            )
+            _current_tariff_topic = None
         return
 
+    # --- Main DSMR telegram topic ---
     topic = settings.dsmr_mqtt_topic
     if _current_dsmr_topic is not None and _current_dsmr_topic != topic:
         mqtt_manager.unsubscribe(_current_dsmr_topic)
@@ -90,6 +163,24 @@ def apply_dsmr_subscription(settings: "Settings") -> None:
     _current_dsmr_topic = topic
     logger.info("DSMR ingest enabled — subscribed to topic=%s.", topic)
 
+    # --- DSMR tariff topic (dual-tariff slot indicator) ---
+    tariff_topic = settings.dsmr_tariff_topic if settings.dsmr_tariff_topic else ""
+    if tariff_topic:
+        if _current_tariff_topic is not None and _current_tariff_topic != tariff_topic:
+            mqtt_manager.unsubscribe(_current_tariff_topic)
+        mqtt_manager.subscribe(tariff_topic, lambda payload: handle_tariff_message(payload))
+        _current_tariff_topic = tariff_topic
+        logger.info("DSMR tariff topic — subscribed to topic=%s.", tariff_topic)
+    else:
+        # tariff_topic is empty → unsubscribe any existing tariff subscription.
+        if _current_tariff_topic is not None:
+            mqtt_manager.unsubscribe(_current_tariff_topic)
+            logger.info(
+                "DSMR tariff topic cleared — unsubscribed from topic=%s.",
+                _current_tariff_topic,
+            )
+            _current_tariff_topic = None
+
 
 def handle_message(payload_bytes: bytes, settings: "Settings") -> None:
     """Parse one DSMR MQTT payload and persist it if it passes the sample filter.

tests/test_api_config.py

@@ -732,7 +732,7 @@ def test_put_config_mqtt_reconnect_uses_db_merged_settings(
 
 
 def test_get_config_includes_dsmr_section(client: TestClient) -> None:
-    """GET /api/config must include a DSMR section with expected fields."""
+    """GET /api/config must include a DSMR section with expected fields including DSMR_TARIFF_TOPIC."""
     _login(client)
 
     response = client.get("/api/config")
@@ -746,6 +746,9 @@ def test_get_config_includes_dsmr_section(client: TestClient) -> None:
     assert "DSMR_INGEST_ENABLED" in env_names
     assert "DSMR_MQTT_TOPIC" in env_names
     assert "DSMR_SAMPLE_INTERVAL_S" in env_names
+    assert "DSMR_TARIFF_TOPIC" in env_names, (
+        f"DSMR_TARIFF_TOPIC must be present in DSMR section; got {env_names}"
+    )
 
 
 def test_get_config_includes_tibber_section(client: TestClient) -> None:
@@ -903,6 +906,51 @@ def test_put_config_invalid_dsmr_sample_interval_returns_422_and_does_not_write(
     assert rows.get("DSMR_SAMPLE_INTERVAL_S") != "not-a-number"
 
 
+def test_put_config_dsmr_tariff_topic_persists_and_reflects_in_get(
+    client: TestClient, test_database_urls
+) -> None:
+    """DSMR_TARIFF_TOPIC must persist via PUT and be readable via GET /api/config."""
+    _login(client)
+
+    new_topic = "meter/tariff/slot"
+    payload = _full_config_payload({"DSMR_TARIFF_TOPIC": new_topic})
+    with patch("app.services.dsmr_ingest.apply_dsmr_subscription"):
+        response = client.put(
+            "/api/config",
+            json={"updates": payload},
+            headers={"X-CSRF-Token": "token"},
+        )
+    assert response.status_code == 200
+
+    # The updated value must appear in the GET response.
+    get_resp = client.get("/api/config")
+    body = get_resp.json()
+    dsmr_section = next(s for s in body["sections"] if s["name"] == "DSMR")
+    tariff_field = next(f for f in dsmr_section["fields"] if f["env_name"] == "DSMR_TARIFF_TOPIC")
+    assert tariff_field["value"] == new_topic, (
+        f"Expected DSMR_TARIFF_TOPIC to be {new_topic!r}, got {tariff_field['value']!r}"
+    )
+
+
+def test_put_config_dsmr_tariff_topic_in_settings_payload(client: TestClient) -> None:
+    """DSMR_TARIFF_TOPIC must appear in _settings_payload (GET /api/config returns it)."""
+    _login(client)
+
+    # The default value from Settings must appear in the DSMR section.
+    response = client.get("/api/config")
+    body = response.json()
+
+    dsmr_section = next(s for s in body["sections"] if s["name"] == "DSMR")
+    tariff_field = next(
+        (f for f in dsmr_section["fields"] if f["env_name"] == "DSMR_TARIFF_TOPIC"), None
+    )
+    assert tariff_field is not None, "DSMR_TARIFF_TOPIC must appear in DSMR config section"
+    # Default value should be the DSMR reader meter-stats topic.
+    assert tariff_field["value"] == "dsmr/meter-stats/electricity_tariff", (
+        f"Unexpected default for DSMR_TARIFF_TOPIC: {tariff_field['value']!r}"
+    )
+
+
 def test_get_config_tibber_api_token_value_masked_after_save(
     client: TestClient, test_database_urls
 ) -> None:

tests/test_dsmr_ingest.py

@@ -410,3 +410,95 @@ def test_timestamp_with_utc_offset_suffix(dsmr_db):
     _call_handle_message(data, settings, SessionLocal)
 
     assert _count_readings(SessionLocal) == 1
+
+
+# ---------------------------------------------------------------------------
+# 10. handle_tariff_message: parse, validate, update, reject invalid payloads
+# ---------------------------------------------------------------------------
+
+
+@pytest.fixture()
+def reset_tariff(monkeypatch):
+    """Reset _current_tariff to None before and after each tariff test."""
+    from app.services import dsmr_ingest as _di
+
+    monkeypatch.setattr(_di, "_current_tariff", None)
+    yield
+    # monkeypatch auto-restores on teardown
+
+
+def test_tariff_message_value_2_sets_tariff(reset_tariff):
+    """Payload b'2' must set the current tariff to 2 (normal/peak)."""
+    from app.services.dsmr_ingest import handle_tariff_message, get_current_tariff
+
+    handle_tariff_message(b"2")
+    assert get_current_tariff() == 2
+
+
+def test_tariff_message_value_1_sets_tariff(reset_tariff):
+    """Payload b'1' must set the current tariff to 1 (dal/off-peak)."""
+    from app.services.dsmr_ingest import handle_tariff_message, get_current_tariff
+
+    handle_tariff_message(b"1")
+    assert get_current_tariff() == 1
+
+
+def test_tariff_message_updates_from_2_to_1(reset_tariff):
+    """Subsequent payloads must overwrite the previous tariff value."""
+    from app.services.dsmr_ingest import handle_tariff_message, get_current_tariff
+
+    handle_tariff_message(b"2")
+    assert get_current_tariff() == 2
+    handle_tariff_message(b"1")
+    assert get_current_tariff() == 1
+
+
+def test_tariff_message_strips_whitespace(reset_tariff):
+    """Payloads with surrounding whitespace (e.g. b'2\\n') must be accepted."""
+    from app.services.dsmr_ingest import handle_tariff_message, get_current_tariff
+
+    handle_tariff_message(b"2\n")
+    assert get_current_tariff() == 2
+
+    handle_tariff_message(b" 1 ")
+    assert get_current_tariff() == 1
+
+
+def test_tariff_message_invalid_non_numeric_does_not_update(reset_tariff):
+    """Non-numeric payload must not update the tariff; previous value is preserved."""
+    from app.services.dsmr_ingest import handle_tariff_message, get_current_tariff, set_current_tariff
+
+    set_current_tariff(2)
+    handle_tariff_message(b"x")
+    # Must NOT raise and must NOT change the tariff.
+    assert get_current_tariff() == 2
+
+
+def test_tariff_message_invalid_empty_does_not_update(reset_tariff):
+    """Empty payload must not update the tariff; previous value is preserved."""
+    from app.services.dsmr_ingest import handle_tariff_message, get_current_tariff, set_current_tariff
+
+    set_current_tariff(1)
+    handle_tariff_message(b"")
+    assert get_current_tariff() == 1
+
+
+def test_tariff_message_out_of_range_value_does_not_update(reset_tariff):
+    """Payload with out-of-range integer (not 1 or 2) must not update the tariff."""
+    from app.services.dsmr_ingest import handle_tariff_message, get_current_tariff, set_current_tariff
+
+    set_current_tariff(2)
+    handle_tariff_message(b"3")   # 3 is not a valid tariff
+    assert get_current_tariff() == 2
+
+    handle_tariff_message(b"0")   # 0 is not a valid tariff
+    assert get_current_tariff() == 2
+
+
+def test_tariff_message_does_not_raise_on_any_input(reset_tariff):
+    """handle_tariff_message must never propagate any exception to the caller."""
+    from app.services.dsmr_ingest import handle_tariff_message
+
+    # All of these must complete without raising.
+    for payload in (b"", b"x", b"99", b"\xff\xfe", b"None", b"2.0"):
+        handle_tariff_message(payload)  # must not raise

tests/test_dsmr_subscription_apply.py

@@ -26,11 +26,18 @@ class _FakeMqtt:
         self.unsubscribe_calls.append(topic)
 
 
-def _settings(*, enabled: bool = True, topic: str = "dsmr/json", interval: int = 10):
+def _settings(
+    *,
+    enabled: bool = True,
+    topic: str = "dsmr/json",
+    interval: int = 10,
+    tariff_topic: str = "",
+):
     s = MagicMock()
     s.dsmr_ingest_enabled = enabled
     s.dsmr_mqtt_topic = topic
     s.dsmr_sample_interval_s = interval
+    s.dsmr_tariff_topic = tariff_topic
     return s
 
 
@@ -40,8 +47,9 @@ def fake_mqtt(monkeypatch):
     # apply_dsmr_subscription does `from app.integrations.mqtt import mqtt_manager`
     # at call time, so patching the module attribute is picked up.
     monkeypatch.setattr("app.integrations.mqtt.mqtt_manager", fake)
-    # Reset (and auto-restore) the module-level "currently subscribed topic".
+    # Reset (and auto-restore) the module-level "currently subscribed topics".
     monkeypatch.setattr(dsmr_ingest, "_current_dsmr_topic", None)
+    monkeypatch.setattr(dsmr_ingest, "_current_tariff_topic", None)
     return fake
 
 
@@ -90,3 +98,76 @@ def test_disabled_when_never_enabled_is_noop(fake_mqtt):
     assert fake_mqtt.subscribe_calls == []
     assert fake_mqtt.unsubscribe_calls == []
     assert dsmr_ingest._current_dsmr_topic is None
+
+
+# ---------------------------------------------------------------------------
+# Tariff topic subscription management
+# ---------------------------------------------------------------------------
+
+
+def test_enabled_with_tariff_topic_subscribes_both(fake_mqtt):
+    """When enabled and tariff_topic is non-empty, both topics must be subscribed."""
+    dsmr_ingest.apply_dsmr_subscription(
+        _settings(enabled=True, topic="dsmr/json", tariff_topic="dsmr/meter-stats/electricity_tariff")
+    )
+
+    subscribed_topics = [t for t, _ in fake_mqtt.subscribe_calls]
+    assert "dsmr/json" in subscribed_topics
+    assert "dsmr/meter-stats/electricity_tariff" in subscribed_topics
+    assert len(fake_mqtt.subscribe_calls) == 2
+    assert dsmr_ingest._current_tariff_topic == "dsmr/meter-stats/electricity_tariff"
+
+
+def test_enabled_with_empty_tariff_topic_subscribes_only_main(fake_mqtt):
+    """When tariff_topic is empty, only the main DSMR topic is subscribed."""
+    dsmr_ingest.apply_dsmr_subscription(
+        _settings(enabled=True, topic="dsmr/json", tariff_topic="")
+    )
+
+    assert len(fake_mqtt.subscribe_calls) == 1
+    assert fake_mqtt.subscribe_calls[0][0] == "dsmr/json"
+    assert dsmr_ingest._current_tariff_topic is None
+
+
+def test_disabled_after_tariff_subscription_unsubscribes_both(fake_mqtt):
+    """Disabling ingest must also unsubscribe the tariff topic."""
+    dsmr_ingest.apply_dsmr_subscription(
+        _settings(enabled=True, topic="dsmr/json", tariff_topic="dsmr/meter-stats/electricity_tariff")
+    )
+    dsmr_ingest.apply_dsmr_subscription(_settings(enabled=False))
+
+    assert "dsmr/json" in fake_mqtt.unsubscribe_calls
+    assert "dsmr/meter-stats/electricity_tariff" in fake_mqtt.unsubscribe_calls
+    assert dsmr_ingest._current_dsmr_topic is None
+    assert dsmr_ingest._current_tariff_topic is None
+
+
+def test_tariff_topic_change_resubscribes(fake_mqtt):
+    """Changing the tariff topic must unsubscribe the old one and subscribe the new one."""
+    old_tariff = "dsmr/meter-stats/electricity_tariff"
+    new_tariff = "meter/tariff"
+
+    dsmr_ingest.apply_dsmr_subscription(
+        _settings(enabled=True, topic="dsmr/json", tariff_topic=old_tariff)
+    )
+    dsmr_ingest.apply_dsmr_subscription(
+        _settings(enabled=True, topic="dsmr/json", tariff_topic=new_tariff)
+    )
+
+    assert old_tariff in fake_mqtt.unsubscribe_calls
+    subscribed_topics = [t for t, _ in fake_mqtt.subscribe_calls]
+    assert new_tariff in subscribed_topics
+    assert dsmr_ingest._current_tariff_topic == new_tariff
+
+
+def test_tariff_topic_cleared_unsubscribes(fake_mqtt):
+    """Setting tariff_topic to empty after it was subscribed must unsubscribe it."""
+    dsmr_ingest.apply_dsmr_subscription(
+        _settings(enabled=True, topic="dsmr/json", tariff_topic="dsmr/meter-stats/electricity_tariff")
+    )
+    dsmr_ingest.apply_dsmr_subscription(
+        _settings(enabled=True, topic="dsmr/json", tariff_topic="")
+    )
+
+    assert "dsmr/meter-stats/electricity_tariff" in fake_mqtt.unsubscribe_calls
+    assert dsmr_ingest._current_tariff_topic is None

tests/test_energy_expose.py

@@ -1117,3 +1117,211 @@ def test_export_revenue_total_falls_back_to_sum_when_no_active_contract(energy_d
     assert value == pytest.approx(2.00, rel=1e-9), (
         f"Expected pure SUM=2.00 with no active contract, got {value!r}"
     )
+
+
+# ---------------------------------------------------------------------------
+# 15. Tariff-aware pricing: buy_price_now / sell_price_now honour _current_tariff
+# ---------------------------------------------------------------------------
+
+
+_DUAL_TARIFF_PRICING = {
+    "kind": "manual",
+    "buy_dal": "0.2500",
+    "buy_normal": "0.2700",
+    "sell_dal": "0.0900",
+    "sell_normal": "0.0950",
+    "energy_tax": "0.1234",
+    "ode": "0.0015",
+}
+
+
+@pytest.fixture()
+def reset_tariff(monkeypatch):
+    """Reset dsmr_ingest._current_tariff to None before/after each tariff test."""
+    from app.services import dsmr_ingest as _di
+
+    monkeypatch.setattr(_di, "_current_tariff", None)
+    yield
+
+
+def _insert_manual_period(energy_db) -> None:
+    """Insert a single non-degraded manual pricing period into energy_db."""
+    t0 = datetime(2026, 3, 1, 10, 0, tzinfo=timezone.utc)
+    with Session(energy_db) as session:
+        _make_period(
+            session,
+            period_start=t0,
+            import_cost=0.10,
+            export_revenue=0.05,
+            currency="EUR",
+            pricing=_DUAL_TARIFF_PRICING,
+            degraded=False,
+        )
+        session.commit()
+
+
+def test_buy_price_tariff_1_returns_dal(energy_db, reset_tariff) -> None:
+    """buy_price_now must return buy_dal when tariff=1 (off-peak)."""
+    from app.integrations.expose import build_catalog
+    from app.services.dsmr_ingest import set_current_tariff
+
+    _insert_manual_period(energy_db)
+    set_current_tariff(1)
+
+    with Session(energy_db) as session:
+        catalog = build_catalog(session)
+        buy_entry = next(e for e in catalog if e.entity.key == "energy.buy_price_now")
+        value = buy_entry.entity.value_getter(session)
+
+    assert value == pytest.approx(0.2500), f"Expected buy_dal=0.2500, got {value!r}"
+
+
+def test_buy_price_tariff_2_returns_normal(energy_db, reset_tariff) -> None:
+    """buy_price_now must return buy_normal when tariff=2 (peak)."""
+    from app.integrations.expose import build_catalog
+    from app.services.dsmr_ingest import set_current_tariff
+
+    _insert_manual_period(energy_db)
+    set_current_tariff(2)
+
+    with Session(energy_db) as session:
+        catalog = build_catalog(session)
+        buy_entry = next(e for e in catalog if e.entity.key == "energy.buy_price_now")
+        value = buy_entry.entity.value_getter(session)
+
+    assert value == pytest.approx(0.2700), f"Expected buy_normal=0.2700, got {value!r}"
+
+
+def test_buy_price_tariff_none_falls_back_to_normal(energy_db, reset_tariff) -> None:
+    """buy_price_now must return buy_normal when tariff is None (no DSMR tariff received yet)."""
+    from app.integrations.expose import build_catalog
+    from app.services.dsmr_ingest import set_current_tariff
+
+    _insert_manual_period(energy_db)
+    set_current_tariff(None)  # explicitly None (no tariff received)
+
+    with Session(energy_db) as session:
+        catalog = build_catalog(session)
+        buy_entry = next(e for e in catalog if e.entity.key == "energy.buy_price_now")
+        value = buy_entry.entity.value_getter(session)
+
+    assert value == pytest.approx(0.2700), f"Expected buy_normal=0.2700 fallback, got {value!r}"
+
+
+def test_sell_price_tariff_1_returns_dal(energy_db, reset_tariff) -> None:
+    """sell_price_now must return sell_dal when tariff=1 (off-peak)."""
+    from app.integrations.expose import build_catalog
+    from app.services.dsmr_ingest import set_current_tariff
+
+    _insert_manual_period(energy_db)
+    set_current_tariff(1)
+
+    with Session(energy_db) as session:
+        catalog = build_catalog(session)
+        sell_entry = next(e for e in catalog if e.entity.key == "energy.sell_price_now")
+        value = sell_entry.entity.value_getter(session)
+
+    assert value == pytest.approx(0.0900), f"Expected sell_dal=0.0900, got {value!r}"
+
+
+def test_sell_price_tariff_2_returns_normal(energy_db, reset_tariff) -> None:
+    """sell_price_now must return sell_normal when tariff=2 (peak)."""
+    from app.integrations.expose import build_catalog
+    from app.services.dsmr_ingest import set_current_tariff
+
+    _insert_manual_period(energy_db)
+    set_current_tariff(2)
+
+    with Session(energy_db) as session:
+        catalog = build_catalog(session)
+        sell_entry = next(e for e in catalog if e.entity.key == "energy.sell_price_now")
+        value = sell_entry.entity.value_getter(session)
+
+    assert value == pytest.approx(0.0950), f"Expected sell_normal=0.0950, got {value!r}"
+
+
+def test_sell_price_tariff_none_falls_back_to_normal(energy_db, reset_tariff) -> None:
+    """sell_price_now must return sell_normal when tariff is None."""
+    from app.integrations.expose import build_catalog
+    from app.services.dsmr_ingest import set_current_tariff
+
+    _insert_manual_period(energy_db)
+    set_current_tariff(None)
+
+    with Session(energy_db) as session:
+        catalog = build_catalog(session)
+        sell_entry = next(e for e in catalog if e.entity.key == "energy.sell_price_now")
+        value = sell_entry.entity.value_getter(session)
+
+    assert value == pytest.approx(0.0950), f"Expected sell_normal=0.0950 fallback, got {value!r}"
+
+
+def test_tibber_buy_price_not_affected_by_tariff(energy_db, reset_tariff) -> None:
+    """Tibber buy_price_now must NOT be affected by the DSMR tariff — always uses 'buy' key."""
+    from app.integrations.expose import build_catalog
+    from app.services.dsmr_ingest import set_current_tariff
+
+    t0 = datetime(2026, 4, 1, 9, 0, tzinfo=timezone.utc)
+    tibber_pricing = {
+        "kind": "tibber",
+        "buy": "0.3100",
+        "sell": "0.1500",
+        "energy_tax": "0.1234",
+        "sell_adjust": "0.0100",
+        "total": "0.3100",
+    }
+
+    with Session(energy_db) as session:
+        _make_period(
+            session,
+            period_start=t0,
+            pricing=tibber_pricing,
+            degraded=False,
+        )
+        session.commit()
+
+    # Tibber pricing must return the same value regardless of tariff.
+    for tariff_val in (1, 2, None):
+        set_current_tariff(tariff_val)
+        with Session(energy_db) as session:
+            catalog = build_catalog(session)
+            buy_entry = next(e for e in catalog if e.entity.key == "energy.buy_price_now")
+            value = buy_entry.entity.value_getter(session)
+        assert value == pytest.approx(0.3100), (
+            f"Tibber buy price must be 0.3100 regardless of tariff={tariff_val!r}, got {value!r}"
+        )
+
+
+def test_tibber_sell_price_not_affected_by_tariff(energy_db, reset_tariff) -> None:
+    """Tibber sell_price_now must NOT be affected by the DSMR tariff — always uses 'sell' key."""
+    from app.integrations.expose import build_catalog
+    from app.services.dsmr_ingest import set_current_tariff
+
+    t0 = datetime(2026, 4, 1, 9, 15, tzinfo=timezone.utc)
+    tibber_pricing = {
+        "kind": "tibber",
+        "buy": "0.3100",
+        "sell": "0.1500",
+        "energy_tax": "0.1234",
+        "sell_adjust": "0.0100",
+        "total": "0.3100",
+    }
+
+    with Session(energy_db) as session:
+        _make_period(
+            session,
+            period_start=t0,
+            pricing=tibber_pricing,
+            degraded=False,
+        )
+        session.commit()
+
+    for tariff_val in (1, 2, None):
+        set_current_tariff(tariff_val)
+        with Session(energy_db) as session:
+            catalog = build_catalog(session)
+            sell_entry = next(e for e in catalog if e.entity.key == "energy.sell_price_now")
+            value = sell_entry.entity.value_getter(session)
+        assert value == pytest.approx(0.1500), (
+            f"Tibber sell price must be 0.1500 regardless of tariff={tariff_val!r}, got {value!r}"
+        )