Stage 6 — Write

2.9 Stage 6 — Output write

The write is split between the synchronous flow and the background post-process worker.

Synchronous write. When the receipt clears validation, the synchronous flow inserts the receipts row together with the raw vision-extraction record. This is the state the verified preview is served from: the user's receipt exists in the database the moment the preview appears.

Asynchronous write. The background post-process worker then completes the record:

• receipt_line_items — line items are written after canonical product resolution (2.7), so each row carries its canonical reference.
• receipt_rewards — the reward accounting entry, including the point breakdown shown to the user.
• receipt_quality — the quality assessment the trust layer (03) reads.

Price observations. Price observations are produced by a separate daily price-epoch flow that reads verified receipts, aggregates observations per epoch, and commits the epoch root on-chain in the asynchronous tier (01 Phase B). They are derived from receipt rows rather than written by the receipt pipeline itself.

Downstream flows — trust scoring, reward settlement, the price ledger — read the receipt and quality rows directly. Writes are idempotent on the receipt identifier: replay-safe in case the worker retries.