{"id":"event-store-persist-no-flush-no-fsync","text":"`EventStore._persist_event` opens the NDJSON file in append mode, writes one JSON line, and closes it without calling `flush()` or `os.fsync()`; written data may remain in OS buffers or Python buffers at crash time.","truth_value":"IN","source":"entries/2026/05/29/topic-batch-atomicity-gap.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"event-store-persist-no-flush-no-fsync","truth_value":"IN","reason":"premise"}]}}