Sir, where have you been? I've been looking for exactly this, a self-hosted pinboard clone. A look and feel like miniflux [1] - there's something timeless about it. I also appreciate the public frontend. This looks like a great project. Have you sensed a need to add postgres/mysql support or perhaps that's overkill? Any plans to implement archiving?
I would love details on a docker build for my own homelab. I don't know Haskell, but perhaps it's time to tinker with something new.
[1] https://www.npmjs.com/package/gh-pages