It seems like HA is sending no zero values to influxdb.
I have several tasmota power plugs with power metering.
When the plug is switched off, influxdb is reporting no data and grafana can not show a graph or is showing graphs with wildly interpolated lines when instead there should be a line at zero.
Is there a way to report also the zero values to influxdb?
I hade the same issue today.
I have a query where I read different values and subtract them within the query.
But one column most of the time is empty and then my query does not bring a result.
I added this line to exchange every empty field with a 0
|> map(fn: (r) => ({ r with empty_column_name: if exists r.empty_column_name then r.empty_column_name else 0.0 }))