Deleting messed up statistic data

Hi Folks,

I am tracking power consumption with various devices.
One recently messed up my entire data:

This was caused by a Fibaro Plug monitoring my printer.
Obviously on Nov 6th at 21:48

However, if I try to adjust it, I don’t see the wrong data.
Is this because the steps are 5 minutes instead of e.g. 1 minute?

Any hint is greatly appreciated.

Interested in deleting wrong statistics too.