In GunDB, this was a non-issue. For every new app, a user would just have a new node in their graph for all of the app data.

But in nostr, there is no concept of user data. Just a flat hierarchy of events associated with pubkeys. nostr:note1hjf8rv7nus5085xq5aafpqwus8epaapuf5qlkjvmzq94pawn5m0sars7dg