Thank‘s a lot. Great solution 
did you ever solve this?
Sort of. Because I couldn’t add entries to those two days (because HA said there are no statistics for those days), I ended up adjusting some other two days later, by adding that missing kWh to those days, so although those four days (two that was without data at all, and those two that I altered) are not correct, the total amounts are correct.
I just tried to alter those days from last year again, and seems like it is STILL not possible to adjust values if there is no statistics at all for some specific day.
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