Remove last_reset attribute and set state class to `total_increasin…

…g` for powerwall energy sensors (home-assistant#54808)

homeassistant/components/powerwall/sensor.py

@@ -3,7 +3,11 @@
 
 from tesla_powerwall import MeterType
 
-from homeassistant.components.sensor import STATE_CLASS_MEASUREMENT, SensorEntity
+from homeassistant.components.sensor import (
+    STATE_CLASS_MEASUREMENT,
+    STATE_CLASS_TOTAL_INCREASING,
+    SensorEntity,
+)
 from homeassistant.const import (
     DEVICE_CLASS_BATTERY,
     DEVICE_CLASS_ENERGY,
@@ -12,7 +16,6 @@
     PERCENTAGE,
     POWER_KILO_WATT,
 )
-import homeassistant.util.dt as dt_util
 
 from .const import (
     ATTR_FREQUENCY,
@@ -151,10 +154,9 @@ def extra_state_attributes(self):
 class PowerWallEnergyDirectionSensor(PowerWallEntity, SensorEntity):
     """Representation of an Powerwall Direction Energy sensor."""
 
-    _attr_state_class = STATE_CLASS_MEASUREMENT
+    _attr_state_class = STATE_CLASS_TOTAL_INCREASING
     _attr_native_unit_of_measurement = ENERGY_KILO_WATT_HOUR
     _attr_device_class = DEVICE_CLASS_ENERGY
-    _attr_last_reset = dt_util.utc_from_timestamp(0)
 
     def __init__(
         self,