Stage 6 — Write

2.9 Stage 6 — Output write

A single Postgres transaction writes:

INSERT INTO receipts (...) VALUES (...);
INSERT INTO receipt_line_items (...) VALUES (...);
INSERT INTO price_observations (...) VALUES (...);
INSERT INTO events (event_type, payload) VALUES ('receipt.verified', {...});

The events row triggers two downstream consumers:

• Trust scorer (03) — picks up the event, computes the trust score, writes to trust_scores.
• Settlement worker — queues a bINT.pending credit. The actual on-chain mint happens in the asynchronous tier (01 Phase B).

The transaction is idempotent on (user_id, perceptual_hash): replay-safe in case the worker retries.