Peer to peer Synchronization of any kind, e.g. between two local database files?
This is more of a question, but does password safe offer peer to peer synchronization of any kind? The simplest way would be simply to any other database file, because then that other file can be in something like dropbox/syncthing as a "synced copy" that I can then manually sync to the "local copy". (This indirection is useful to properly deal with sync conflicts produced in the dropbox/syncthing folder.)
The synchronization should ideally be smart enough to understand manual deletions, that is to not only simply put the superset of all known credentials into the database synced to, but to understand the difference between "we didn't have this login yet" vs "this login was explicitly deleted" so that synchronization will sync explicit deletion around instead of undoing it again (via refetching the deleted credentials from the database copy that didn't have them deleted yet).