I use keepassXC for work and I only use it on one machine at a time. I don’t have any experience syncing it around to multiple devices, so you might have a better perspective than I do on that.

For personal use, I self host vaultwarden and use it on my desktop and Android phone. I’m able to use the bitwarden app just fine on my phone, even when I turn on airplane mode and am unable to sync.

Bitwarden works offline. Obviously can’t save to the server, but reading from what’s already on your local machine works just fine.

You say that like this is news to me. 🙄

https://scitechdaily.com/america-is-sinking-28-major-cities-are-slowly-going-under/

Given enough people and time, we have a track record of messing stuff up.

Looks like it can be flashed with ESPHome.

Or a zigbee feeder is another option.