Remove wrong energy data?

I am using the HACS GitHub - DarwinsBuddy/WienerNetzeSmartmeter: A home-assistant integration supporting WienerNetze Smartmeters as sensors to get my smart meter readings. somehow it failed and doubled the consumed amout of kWh.
How I can delete all data related to this sensor from the database, energy dashboard, etc?

Edit: I found the hint on using the statistics UI. Thats useable, for some data.

But open question, is there a way to add statistic data, if there was no data for a point in time?

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Same problem, same question, different sensor. Is there any good how-to getting rid of wrong energy data and start from scratch?
thanks!