Fix monetary rate sensor state class

custom_components/dte_rates/sensor.py

@@ -3,7 +3,7 @@
 from collections import defaultdict
 from decimal import Decimal
 
-from homeassistant.components.sensor import SensorDeviceClass, SensorEntity, SensorStateClass
+from homeassistant.components.sensor import SensorDeviceClass, SensorEntity
 from homeassistant.components import persistent_notification
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant, callback
@@ -76,7 +76,6 @@ async def async_setup_entry(
 class _DteBaseRateSensor(CoordinatorEntity, SensorEntity):
     _attr_native_unit_of_measurement = "USD/kWh"
     _attr_device_class = SensorDeviceClass.MONETARY
-    _attr_state_class = SensorStateClass.MEASUREMENT
 
     def __init__(self, coordinator, entry: ConfigEntry) -> None:
         super().__init__(coordinator)

docs/README.md

@@ -12,3 +12,4 @@ Current research notes:
 
 - `research/rider18-export-rates.md` - Rider 18 export-rate source mapping and PSCR formula decisions.
 - `research/issue-3-rate-modifiers.md` - PSCR/tax modifier defaults and calculation scope for real out-of-pocket rates.
+- `research/issue-5-entity-type.md` - Home Assistant monetary sensor state-class warning and entity metadata decision.

docs/research/issue-5-entity-type.md

@@ -0,0 +1,27 @@
+# Issue 5 Entity Type Warning
+
+## Source
+
+- GitHub issue: https://github.com/javaDevJT/DTE-Rates-for-Home-Assistant/issues/5
+- Title: Entity type issue
+- Created: 2026-05-29
+
+## Report
+
+Home Assistant logs warnings for `DteImportRateSensor` and `DteExportRateSensor`:
+
+`device_class: monetary` was combined with `state_class: measurement`.
+
+Current Home Assistant sensor validation rejects that combination. Monetary sensors may have no state class, or use state class `total` when the entity represents a total amount. These rate sensors represent a current price in `USD/kWh`, not an accumulating monetary total.
+
+## Decision
+
+- Keep `device_class: monetary`.
+- Keep `native_unit_of_measurement: USD/kWh`.
+- Remove `state_class` from the import/export price sensors.
+
+This preserves the current-price entity shape while avoiding invalid long-term statistics metadata.
+
+## Reference
+
+- Home Assistant sensor developer docs: https://developers.home-assistant.io/docs/core/entity/sensor/

tests/test_sensor.py

@@ -84,6 +84,23 @@ def test_import_sensor_returns_default_out_of_pocket_rate(monkeypatch):
     }
 
 
+def test_rate_price_sensors_do_not_set_invalid_monetary_state_class(monkeypatch):
+    monkeypatch.setattr("custom_components.dte_rates.sensor.dt_util.now", lambda: datetime(2026, 3, 1, 12, 0))
+
+    coordinator = _coordinator_with_rate()
+    entry = SimpleNamespace(entry_id="entry_18", data={CONF_SELECTED_RATE: "D1.11", CONF_NET_METERING: False})
+
+    import_sensor = DteImportRateSensor(coordinator, entry)
+    export_sensor = DteExportRateSensor(coordinator, entry)
+
+    assert getattr(import_sensor, "_attr_device_class", None) == "monetary"
+    assert getattr(export_sensor, "_attr_device_class", None) == "monetary"
+    assert import_sensor.native_unit_of_measurement == "USD/kWh"
+    assert export_sensor.native_unit_of_measurement == "USD/kWh"
+    assert getattr(import_sensor, "_attr_state_class", None) is None
+    assert getattr(export_sensor, "_attr_state_class", None) is None
+
+
 def test_import_sensor_can_omit_modifiers(monkeypatch):
     monkeypatch.setattr("custom_components.dte_rates.sensor.dt_util.now", lambda: datetime(2026, 3, 1, 12, 0))