Append-only audit tables enforced by Postgres triggers, a GRANT model and
an audited retention purge; a single-writer hash chain with signed Merkle
checkpoints, verification and daily alerting; sealed JSONL exports to S3
Object Lock (COMPLIANCE, 6 years); canonical content agreed with
qbit-secured-data so only audit tokens are sealed.
Owner decisions (2026-10-12): all recommendations accepted.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>