Hacker News Reader

> I just want cards on a board I can move around (with a bit of metadata)

If I may, what did you finally settle on?

Still on Trello for now.

Tempted to try building something from scratch since I can always see myself using such a system.

Have you tried Taiga? https://resources.taiga.io/features/5minkanban/ and it's open source (AGPL3)

Not OP but I settled on Deck which is a NextCloud plugin, good enough for me and my wife.