Recorder.purge_entities not working as expected

[DrMor (Yoav)]

I have a grill thermometer that works great with Home Assistant (Inkbird IBT-4X, but I don’t think it matters). However when using it, I want to have an option to clear the history of the sensor completely, because there’s no real point when cooking today to see yesterday’s history.
My script for clearing the history is:

alias: Clear iBBQ history
sequence:
  - service: recorder.purge_entities
    target:
      entity_id: sensor.ibbq_1d0f_temperature_probe_1
    data:
      keep_days: 0
mode: single

In the history for this sensor I still see data after running the script.
I tried multiple times. I tried restarting home assistant.
This is what I see in the history:

The weird thing is that it looks like only some data survived the purge, I had a lot more data that was cleared, it for some reason just kept a few data points.
I also don’t see any errors in the logs.

Am I doing something wrong? Or is there an issue with the purge service?

EDIT: I found this post which seems to be exactly it:

Ability to clear (long term) statistics for excluded entitites

Background The long term statistics (i.e. the statistics table) is never purged. Nor is there a way to do it manually without doing SQL statements directly in the database. Default is to have all entities recorded, and for entities having the right types of values they thus by default end up in this ever growing table. After a year or so, people will (rightfully) start to optimize their ever growing database by excluding entities from the recorder. Problem The problem is then, that there is …

It wasn’t clear to me that purge actually doesn’t clear the long term statistics.
So I guess nothing I can (easily) do?

[Ildar_Gabdullin]

@DrMor

purge actually doesn’t clear the long term statistics.

LTS is kept forever & not touched by “purge”.

@DrMor

I still see data after running the script.

Probably because “purge” is not smth which is done “right here, right now”. It needs some time. Let’s say that you kind of “schedule” it.

@DrMor

I want to have an option to clear the history of the sensor completely, because there’s no real point when cooking today to see yesterday’s history.

This is a weird way of using “purge”.
What you really need is a card/view to see only a today’s history (or a history for last hours).

[DrMor (Yoav)]

I get it now, thanks.