HN invited me to repost it. I thought it was a good idea.

Official practice (see FAQ): please also consider page:

https://news.ycombinator.com/invited

as reported by the unofficial

https://github.com/minimaxir/hacker-news-undocumented

This is in the FAQ: https://news.ycombinator.com/newsfaq.html#reposts.

reposting is permitted while unnoticed if not done too often (once in two weeks would be ok imo)