Add missing last_rest in Tibber (#61914)

homeassistant/components/tibber/sensor.py

@@ -455,6 +455,24 @@ class TibberSensorRT(TibberSensor, update_coordinator.CoordinatorEntity):
         state = live_measurement.get(self.entity_description.key)
         if state is None:
             return
+        if self.entity_description.key in (
+            "accumulatedConsumption",
+            "accumulatedProduction",
+        ):
+            # Value is reset to 0 at midnight, but not always strictly increasing due to hourly corrections
+            # If device is offline, last_reset should be updated when it comes back online if the value has decreased
+            ts_local = dt_util.parse_datetime(live_measurement["timestamp"])
+            if ts_local is not None:
+                if self.last_reset is None or (
+                    state < 0.5 * self.native_value  # type: ignore # native_value is float
+                    and (
+                        ts_local.hour == 0
+                        or (ts_local - self.last_reset) > timedelta(hours=24)
+                    )
+                ):
+                    self._attr_last_reset = dt_util.as_utc(
+                        ts_local.replace(hour=0, minute=0, second=0, microsecond=0)
+                    )
         if self.entity_description.key == "powerFactor":
             state *= 100.0
         self._attr_native_value = state