Append-Only Audit — check a Python event store and its projections, then fix them

Paste the event-sourcing code behind one service - the Postgres schema, the asyncpg event store and the projectors. Free in your browser: 21 checks (UNIQUE (stream_id, version), expected versions, appends in one transaction, immutable events, ordered reads, sequence gaps, checkpoints committed with the read model, replay-safe writes, swallowed failures, rebuilds). Then a store audit or a projection audit with exact edits per finding, or the whole fixed files, re-checked by the page. Derived from @wshobson/event-store-design and @wshobson/projection-patterns (Seth Hobson, MIT). Not affiliated with Kurrent (formerly Event Store Ltd) or KurrentDB / EventStoreDB.