No need to apologise for any delay. I am not really in a rush, and even if I were, well, that would be my problem, not yours. And thanks for your responses.
I will look at the Plotly Graph, that might be interesting. For the rest, some remarks:
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We are not looking to bill or invoice, but to build insight. How big is the problem of current fixed fee, how unfair between big and small RV’s.
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No Rieman integration! On long teleperiod you have a really bad precision, and on short teleperiod the precision is still not perfect, but you get a huge database. More importantly, it is not needed, because Tasmota already has nice kWh figures, which are chip derived so are not bothered by any teleperiod.
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Utility meters are indeed what I have, but their readout is the problem. Hence this request, which is about the readout, not about how to collect the data. Native Energy panels ignore the 12 hour offset (or rather, I suspect they recalculate the “proper” day value), And Stat-panels do show the 12h offset, cannot go back in time.
But as stated, the data is there, in the utility meter, just need so visualize. So I will look at Ploty Graph.
But back to the original request: “if I were to hack some of the internal sources, where should I start?”
Also, anyone mind voting for this enhancement: Link Date Picker and Stat Graph - #2 by cybermaus