StashDB is a great single-point resource for identifying missing scenes in my library. However, I find myself doing a lot of bouncing around trying to compare a studio on StashDB with a studio on my own Stash instance to discover missing scenes.
While browsing scenes on StashDB, my wish is to quickly identify which scenes I already have. My suggestion is to add a UI icon that indicates you have the scene already (like a small checkmark in the bottom corner of a scene thumbnail).
The most practical logic for this would probably be a simple conditional: if the current user has previously submitted a fingerprint for the scene in question, display checkmark. Else, do not.
It’s not perfect, because it doesn’t account for scenes that are later deleted, but I don’t think it would require any changes to the back-end structure of stash-box, since fingerprint submissions are already stored in the database.