There are repos out there with over a hundred thousand issues - https://github.com/microsoft/vscode/issues?q=is%3Aissue%20st... has 180,000+ now. https://github.com/flutter/flutter/issues?q=is%3Aissue is just over 100,000 across both open and closed.

I take a lot of notes but I don't think I'm going to end up with the largest issue collection on GitHub.

I could always spin up a second repo or org if I do run out. I have my notes scattered across several hundred repos (and a hunch of orgs) already.