Fix #3: Preserve gas_daily_kwh sensor on reboot or no new data

addon_meterstoha/build.yaml

@@ -1,10 +1,10 @@
 ---
 build_from:
-  aarch64: ghcr.io/hassio-addons/base:18.1.1
-  amd64: ghcr.io/hassio-addons/base:18.1.1
-  # armhf: ghcr.io/hassio-addons/base:18.1.1
-  armv7: ghcr.io/hassio-addons/base:18.1.1
-  # i386: ghcr.io/hassio-addons/base:18.1.1
+  aarch64: ghcr.io/hassio-addons/base:20.1.1
+  amd64: ghcr.io/hassio-addons/base:20.1.1
+  # armhf: ghcr.io/hassio-addons/base:20.1.1
+  armv7: ghcr.io/hassio-addons/base:20.1.1
+  # i386: ghcr.io/hassio-addons/base:20.1.1
 # codenotary:
 #   base_image: dummy@dummy.com
 #   signer: dummy@dummy.com

addon_meterstoha/config.yaml

@@ -1,6 +1,6 @@
 ---
 name: MetersToHA
-version: "v2025.9.3"
+version: "v2026.5.3"
 slug: meterstoha
 description: MetersToHA add-on for Home Assistant
 url: https://github.com/mdeweerd/meterstoha

apps/meters_to_ha/meters_to_ha.py

@@ -3515,6 +3515,41 @@ def update_grdf_device(self, json_file):
                 update_state_file(
                     self.configuration[STATE_FILE], {"grdf": entity_data}
                 )
+
+            # Preserve gas_daily_kwh sensor on reboot or no new data (issue #3)
+            # Try to get the last known value from HA
+            for daily_sensor in (
+                sensor_name_daily_pce_kwh,
+                sensor_name_daily_generic_kwh,
+            ):
+                try:
+                    response = self.open_url(
+                        HA_API_SENSOR_FORMAT % (daily_sensor,)
+                    )
+                    if isinstance(response, dict) and "state" in response:
+                        # Preserve the last known value
+                        last_daily_kwh = response["state"]
+                        last_attributes = response.get("attributes", {})
+
+                        # Update the sensor to preserve its value
+                        preserve_data = {
+                            "state": last_daily_kwh,
+                            "attributes": {
+                                **last_attributes,
+                                "last_check": now_isostr,
+                            },
+                        }
+                        r = self.open_url(
+                            HA_API_SENSOR_FORMAT % (daily_sensor,),
+                            preserve_data,
+                        )
+                        self.mylog(
+                            f"Preserved {daily_sensor}: {last_daily_kwh}"
+                        )
+                        break
+                except RuntimeError:
+                    # Sensor doesn't exist yet or is unavailable
+                    pass
         else:
             self.mylog(
                 f"    update value is {date_time.isoformat()}:"