Device registry
Your desktop installs, kept as one jsonb on your user row, so the track page can say which of your machines holds a project and whether it is newer than what was pushed.
What it is
Every desktop install reports itself to your account: its name, platform, when it was last seen, and which tracks it holds (the folders linked to cloud tracks, how fresh the project on disk is, and the tracks that exist only there). Names and dates, never files.
On a track page, under Details, you see "Project on Studio Mac, opened Tuesday" for each of your own machines that has it, and "newer than what's on Aden" when that copy has changes that were never pushed. When a linked folder pulls a newer project, the message names the machine that pushed it.
Only you see your devices. Nobody else's machines show on your pages.
Desktop upload suggestions
The desktop app notices a new export, a take named after an existing track or a file named after one, and offers to put it on Aden as a card on Home.
Nicknames
An optional nickname on your account that replaces your real name everywhere you are shown to other people, guarded so it cannot impersonate an act you are not on.