Delayed response: I am using combination of keepass (ownkeepass) and syncthing to keep databases in sync between devices and PCs.
On SFOS, I sync by running syncthing only when I want to update the password database. This is done from terminal and using browser to follow its state. As I never modify the database on SFOS, you don’t have to sync from phone proactively. On swarm of PCs, syncthing is running 24/7
In addition, data is backed up (kopia) regularly. Just make sure you have password for the backup available without keepass. So, if something goes wrong, you can restore the database.