Removing samples in persistence / graphs

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2

You can use rrd inspector to manipulate the rrd file (it’s a little bit tricky to get it up and running, anyway… see HowTo Change values in an rrd4j database for instructions.

On the long run, openHAB does not filter any incoming data, so you will have to use an additional item to manipulate the values with a rule, like that:

rule "incoming temperature"
when
   Item measured_temperature changed
then
   if(Math::abs((newState as Number).floatValue - (previousState as Number).floatValue) > 50)
       stored_temperature.postUpdate(stored_temperature.state)
    else
        stored_temperature.postUpdate(newState)
end

This way you won’t lose the time stamps.
BUT: if there are two spikes together, they are maybe not filtered.
So maybe better compare to the last stored_temperature.