Best way to show long term data?

I’ve noticed that HomeAssistant gets unresponsive if showing history data for about two weeks using the default sqlite database.

Is it possible to do some throttling when asking for the history data?

I have 4 mini-graph-cards showing history like this:

          - entities:
              - entity: sensor.floor_2_kwh_verlichting_total
                name: VERLICHTING
            font_size: 75
            hours_to_show: 336
            icon: 'mdi:flash'
            line_width: 8
            points_per_hour: 0.041667
            type: 'custom:mini-graph-card'

But the result is that my homeassistant gets unresponsive and goes to 100% CPU due to the history api calls.

[bramkragten]

I can think of 2 solutions:

Instead of updating the history on every state update, you could update it on a time interval if the state is changed, this could be a setting.

And on updating only get the new data instead of all data, store the last fetch timestamp and use that as start for the history api, then concat the new data with the old.

I could look into it in the next weeks or so if you think it is a good idea.

[kalkih]

Fetching of history is now much more efficient thanks to #88 There’s also a new option update_interval to set the interval between history requests, but with the changes in #88 I don’t really think it should be needed, unless your system is really struggling.