Syncthing can realtime monitor a folder that just has the keepass file and automatically update to any other syncthing enabled devices in near realtime.
Additionally it can be set to keep versions of the file so you can have copies of older versions to hand whenever things go wrong.
The only real catch is to not have the keepass db open on 2 devices at the same time as any changes made in one may be overwritten by the other as file locking isn't a thing in this method.
I've used Syncthing and keepass in this way for many many years