Energy Monitor - Easy Way to Delete Selective Days

Loving the energy monitor, but would appreciate a way to remove selective days easily please.

I had some incorrect cost values entered when first setting this up, so just want to delete those days to stop their data skewing the weekly/monthly totals.

I know there is a way to do this via statistics in the developer menu, but this is very fiddly and time consuming. Seems like if I want to delete an entire day or week I need to delete every individual minute, one by one!

Many thanks.

Maybe an SQL line could help if you are storing your data in a database