Bought a new computer after using your old one for 15 years?
Did you read The Hobbit from the beginning, and then back(ward) again?
You've finally figured out how to redefine mathematics, so Pi is now exacty 3?
Post your useless, but no doubt epic achievements here
I'll start...
Today, my main library reached 300 books that are fixed and tagged as best as humanly possible

This means that the calibre editor does not point out any errors in the EPUB, all the metadata is as I want it, the cover file is at least 1000 pixels on the long side (if I was able to find one), and any layout issues are fixed.
I still have 437 books to go though