{"id":"event-store-optimistic-concurrency-via-expected-version","text":"`EventStore.append` takes an `expected_version` parameter for optimistic concurrency on stream appends, rejecting writes when the stream has advanced past the caller's version","truth_value":"IN","source":"entries/2026/05/29/topic-ddia-unbundling-concept.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"event-store-optimistic-concurrency-via-expected-version","truth_value":"IN","reason":"premise"}]}}