Replacing electricity use source without losing old graphed data

I’m wanting to split my graphed electricity use, in the energy dashboard, by time-of-use tariffs. I can set the new sources up - but how to retain the old graphed data without double-counting?

I see this has been raised before: Change to multiple tariffs without losing energy dashboard history
without a resolution. Has there been no movement on the issue?

Even just a tickbox to disable new measurements in the “grid consumption” entry of the config would suffice.

Having same problem here (with gas meter) did you find any solution?