History, records, problem words

I love this app, have become a paid supporter and am grateful for the work you are doing. I’m in the midst of memorizing a book (along with a bunch of poetry!)

I would love to see a history feature, particularly being able to see percentages learned over time, as well as how long it took to complete each time.

In a related request, I’d love to be able to see what words I’ve gotten wrong in the past, particularly if they are a problem multiple times.

Thank you!