Add a read-only/in-memory mode

I have vaultwarden running on a vps, but I want to setup a read-only copy on an alternative machine. I thought to use syncthing to copy over the /data/ directory continously, and then start a vaultwarden instance with a ro mount on the data directory.

But that fails on login:



So i was wondering, would this be possible without setting up some weird copying script? Like have a mode that keeps the login tokens etc in memory?