Prevent slight decreases in total values

custom_components/dabpumps/sensor.py

@@ -21,6 +21,7 @@
 from homeassistant.helpers.entity_registry import async_get
 from homeassistant.helpers.event import async_track_time_interval
 from homeassistant.helpers.update_coordinator import CoordinatorEntity
+from homeassistant.helpers.significant_change import check_percentage_change
 
 from datetime import timedelta
 from datetime import datetime
@@ -174,6 +175,17 @@ def _update_attributes(self, status, is_create):
             )
             changed = True
 
+        # additional check for TOTAL and TOTAL_INCREASING values:
+        # ignore decreases that are not significant (less than 10% change)
+        if self._attr_state_class in [SensorStateClass.TOTAL, SensorStateClass.TOTAL_INCREASING] and \
+           self._attr_native_value is not None and \
+           attr_val is not None and \
+           attr_val < self._attr_native_value and \
+           not check_percentage_change(self._attr_native_value, attr_val, 10):
+
+            _LOGGER.debug(f"Ignore non-significant decrease in sensor '{status.key}' ({status.unique_id}) from {self._attr_native_value} to {attr_val}")
+            attr_val = self._attr_native_value
+
         # update value if it has changed
         if is_create or self._attr_native_value != attr_val:
             self._attr_native_value = attr_val