How to undo a false rainrate record?

Rain Rate record is set for September 7th at 17:15
12 mm per minute / 720 mm per hour
It rained at that time but not that hard. :lol:

No weird data in the logfile.
Converted the logfile but false record is still present.

I know how to edit records but not how to undo them.
I don’t know the previous record.

How can I get rid of this record for rainrate for the month, year and all time record.

TIA

see under
action
reset selected all time records
or
action
enter my own all time records