I made some incorrect entries in the historic prices for the exchange between EUR and USD.

Kmymoney now thinks the exchanges rates are inverted.

When I try to re-import the historic prices from a CSV file, nothing changes.

I'd like to "forget" all exchange rate history from 2020, re-load it from the CSV file, and refresh all past transactions to use the most up-to-date knowledge of the exchange rate.

How can that be done?

Ok, so I just renamed the gz file, used gunzip, removed the currency exchange rates from the file, and re-imported. And I've discovered something: KMyMoney seems to be confused about the exchange rates. It offers the reversed one. So, when I import EUR to USD, I need to say it's USD to EUR for it to use the right one when I try to classify a payment.