Date: 2026-05-29
Time: 08:01
I can't access the implementation file, but the test file is self-documenting enough to give you a thorough explanation. Let me work from what's provided.
event-sourcing-store/event_store.py — The implementation behind every API exercised here: how events are stored, how projections replay, how snapshots are serialized, and how LiveProjection subscribes to new eventsevent-sourcing-store/eventstore.py:reconstructstate — How point-in-time reconstruction works and whether up_to is version-based or index-basedevent-sourcing-store/testeventstore.py — The pytest-style test suite, likely covering edge cases and failure modes this script doesn'tevent-sourcing-concurrency-model — How expectedversion interacts with appendbatch — can a batch fail partially, or is it atomic?live-projection-subscription-mechanism — Whether LiveProjection uses observer/callback registration or polling to stay current when new events arrivees-verify-is-script-not-pytest — test_verify.py runs as a standalone Python script with inline assertions, not through a test frameworkes-projection-position-tracks-global-offset — Projection.position is a global event offset (value 5 after processing 5 events across all streams), not a per-stream versiones-expected-version-is-optimistic-lock — EventStore.append with expected_version raises ConcurrencyConflict when the stream's current version doesn't match, implementing optimistic concurrency controles-live-projection-auto-updates — LiveProjection reflects new events immediately after append() without requiring a manual catch_up() calles-snapshot-preserves-position-and-state — Projection.savesnapshot() persists both state and position, enabling a new projection to loadsnapshot() and resume incremental catch-up