Consider the possibility that someone could get your database.

It isn’t a safe. You can’t weld through the side of it and get in. You either make it ridiculous or impossible to get in.

Use something memorable, but insane.

My password is a three-line film quote with numbers in some of the places for letters.

Haikus work great. Memorable, complex. Wrote it yourself? Even better.

Syncthing is encrypted transfers.

The database is encrypted.

And you can set it to not use relays for data, only matchmaking between your own devices.

So it’s an encrypted file, encrypted again, and sent directly from an IP you own to an IP you own.