Not if your "database" is something like SQLite. That is preferable to most alternatives, if you actually want to manipulate data.

If the blog is not much more than a .PLAN file, sure is overkill. But having access to a DB and programming language opens up a few possibilities – and cleaner code compared to hacking some bash scripts doing text manipulation magic.

Now, starting with a database from day zero? I'd say it is a case of YAGNI. Don't add stuff you don't need now. If you need it in the future, then add it. But don't go paying for a hosted DB if a SQLite would suffice.

Oh, and even then, a database would be more useful for the site generation step. Having a DB being called for every page rendered is a recipe for going down with HN traffic (or Slashdot in the older days).

It allows you to do fun things like save comments, post polls, create news items to load on certain days.

Being able to save anything and retrieve can be useful.