Thanks!
For the interested : They’re working on a logseq edition with db backend as a basis for real time collaboration, better performance, data loss prevention during sync.

FAQ states:

Are you going to deprecate Markdown files support? No, we’ll continue to support both file-based and database-based graphs, with a long-term goal of achieving seamless two-way sync between the database and markdown files. This will allow you to leverage the benefits of the database version while still being able to use other tools.

It looks like, for the moment the md version is there to stay. I’d very much like that, because syncing with git or syncthing.

I’m not sure how useful the collaboration part will be for me. Other tools would have to make room for it in our workflow (ticket system, wiki).