fix zero handling

app/collector.py

@@ -24,6 +24,10 @@ logger = logging.getLogger(__name__)
 SENSOR_DEVICE_TYPES = {"WoIOSensor"}
 
 
+def is_all_zero_reading(status: dict[str, Any]) -> bool:
+    return status.get("temperature") == 0 and status.get("humidity") == 0 and status.get("battery") == 0
+
+
 def upsert_device(device_data: dict[str, Any]) -> None:
     device_id = device_data["deviceId"]
     with session_scope() as session:
@@ -55,6 +59,10 @@ def save_reading(device: Device, status: dict[str, Any]) -> None:
         logger.info("Skipping %s (%s): status has no temperature/humidity", device.name, device.id)
         return
 
+    if is_all_zero_reading(status):
+        logger.info("Skipping %s (%s): status is all zeros", device.name, device.id)
+        return
+
     reading = Reading(
         device_id=device.id,
         recorded_at=datetime.now(timezone.utc).replace(tzinfo=None),