* s/regenerates page code/appends a new post section at the end of the page code (just above the footer)

Like, I doubt it would rewrite the entire page, that would get pretty heavy for the longer ones, and require some kind of separate database or at least creating a temporary single-thread one in the server memory. Much easier to just have each post on a thread marked out with some kind of comment tag (so they can be deleted in a fairly simple manner later on - just erase those particular tags and everything between them, plus any associated image file), and with each new one erase the (standardised) footer, then write in the post data and reappend the footer. The html files themselves become the in-place database, making for a considerable saving in terms of disc space and processing overhead.