{"id":"rotation-always-fsyncs","text":"The WAL `_rotate()` method unconditionally calls `flush()` and `os.fsync()` before closing the current segment, providing a durability checkpoint even in `none` mode","truth_value":"IN","source":"entries/2026/05/29/topic-fsync-semantics-by-mode.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"rotation-always-fsyncs","truth_value":"IN","reason":"premise"}]}}