Improve Energy Cost setup and calculation

Hi all,

instead of setup the cost of energy by device/entity AND saving the calculated costs in the database (which does not make sense for me) it would be better to setup the costs per .conf/storage for specific timeframe/dates

e.g.

energy/gascosts
“current” 0,03 (which means 1970 until next change)
next change FROM 11.2022 = 0,1
next change from … and so on

there is no need to save it in the database, the cost calculation is more flexible and can be changed for the history as well.