Already after that I figured out that it's so extensive, providing too many details, making it hard to comprehend for a general HA user.
I'm preparing two articles, with way fewer technical details, describing improved db model supporting PV spot pricing and way of how to approach collecting low-frequency data, like temperatures or HW metrics, read this this article on github
None of them has been 100% finished, yet they should be helpful already. Thanks for heads up.