It should be all in my guide above. To look what entities are stored you can use the webinterface of influxdb (i think it was in the explore option, i don’t use influxdb anymore). There you can check every measurement with for example this select statement:
select * from homeassistant.autogen."%" where time > '2022-04-22' and time < '2022-04-24'
But deleting from there did not work for me. To access the influxdb container you need the addon with elevated access, it’ called advanced ssh & web terminal:
Don’t forget to disable protection mode in the settings. In this you can log into your influxdb container:
docker exec -it addon_a0d7b954_influxdb influx -precision rfc3339
then auth yourself if necessary:
> auth
username: homeassistant
password:
> use homeassistant
Using database homeassistant
and finally you can use the delete command
delete from "%" where entity_id = 'your_sensor'