# MVP-TASK-023 — Durable snapshots and significant history

**Status:** In progress  
**Parent:** MVP-HIST-001-S01–S03, S06–S07; MVP-PROD-003-S02; MVP-PROD-004-S02

## Objective and required behavior

Complete durable finalized snapshots and append-only finalization, checkout, queue, and fulfillment
facts. Product edits/deletion and delivery cannot mutate/delete historical order data.

## Scope, areas, and non-goals

Expected schema/migration, repository transactions, application history writes and integration
tests. Normal current state plus historical facts is preferred. No event-sourcing framework,
history/search UI, analytics, or log-as-history shortcut.

## Evidence and acceptance

Use every listed ID in real-PostgreSQL integration tests, including restart/readback, product
edit/delete, forward/backward sequences, and provider reference. Accept when timestamps/order are
trustworthy, migration/contracts/traceability are current, and inherited DoD passes. Handoff
documents append-only representation and transaction boundaries.