{"id":"btree-mutation-fsync-is-asymmetric","text":"B-tree mutations pay double fsync costs for user data (WAL entry + data page) but skip fsync entirely for structural metadata, creating an asymmetry where key-value pairs survive crashes but the free-page list and allocation state may not.","truth_value":"IN","source":"","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"btree-mutation-fsync-is-asymmetric","truth_value":"IN","reason":"premise"}]}}