hello, don’t know if still valid. But why are you looking in the past to set the ceapest point for todays water heating? I understood that you need to run the water heating once per day anyway …
Starting from today, tibber api changes “level” to “HIGH”, “NORMAL”, “LOW”. So the threshold isn’t working anymore. I updated this locally but maybe this could be useful also for others.
I found this Plugin today and was very happy 
but not working
That is the PriceRatingLevel
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still under discussion: Price issue by Danielhiversen · Pull Request #317 · Danielhiversen/pyTibber · GitHub