almost 1000 comments suggests that this is very popular. doing this monthly would really help, although people may want to repost, so maybe some rule is needed for that. probably marking a post as "REPOST" or "NEW" would help regular readers find new projects.
Adding "REPOST" or "NEW" does nothing to ameliorate the problem of the same comment occurring over and over in search results (particularly hn.algolia.com/?sort=byDate searches).
On the other hand, if each repost consists of just a link to the original post, or a link plus a few words, that would prevent the unpleasantness in search results.
fair point, but i think linking to the original post would make it more difficult to scan though the page, and people would simply not read those posts. might as well ban reposts altogether. so i think if reposts make sense then a tag is better than a link. if links are used they would at least need a short description, so for those that wrote a more detailed post at first, a link with a short desctiption would make sense, but that would benefit from a tag as well.
other tags such as "UPDATE" or "MAJOR UPDATE" could also be considered.
maybe something like this:
Please tag your posts as NEW, REPOST or UPDATE. For reposts and updates try not to repost the whole description but keep it short and link to the previous post instead
