Remove last_reset attribute from FritzBoxEnergySensor (#54644)

homeassistant/components/fritzbox/sensor.py

@@ -1,13 +1,12 @@
 """Support for AVM FRITZ!SmartHome temperature sensor only devices."""
 from __future__ import annotations
 
-from datetime import datetime
-
 from pyfritzhome import FritzhomeDevice
 
 from homeassistant.components.sensor import (
     ATTR_STATE_CLASS,
     STATE_CLASS_MEASUREMENT,
+    STATE_CLASS_TOTAL_INCREASING,
     SensorEntity,
 )
 from homeassistant.config_entries import ConfigEntry
@@ -28,7 +27,6 @@ from homeassistant.const import (
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
-from homeassistant.util.dt import utc_from_timestamp
 
 from . import FritzBoxEntity
 from .const import (
@@ -99,7 +97,7 @@ async def async_setup_entry(
                         ATTR_ENTITY_ID: f"{device.ain}_total_energy",
                         ATTR_UNIT_OF_MEASUREMENT: ENERGY_KILO_WATT_HOUR,
                         ATTR_DEVICE_CLASS: DEVICE_CLASS_ENERGY,
-                        ATTR_STATE_CLASS: STATE_CLASS_MEASUREMENT,
+                        ATTR_STATE_CLASS: STATE_CLASS_TOTAL_INCREASING,
                     },
                     coordinator,
                     ain,
@@ -153,12 +151,6 @@ class FritzBoxEnergySensor(FritzBoxSensor):
             return energy / 1000  # type: ignore [no-any-return]
         return 0.0
 
-    @property
-    def last_reset(self) -> datetime:
-        """Return the time when the sensor was last reset, if any."""
-        # device does not provide timestamp of initialization
-        return utc_from_timestamp(0)
-
 
 class FritzBoxTempSensor(FritzBoxSensor):
     """The entity class for FRITZ!SmartHome temperature sensors."""