{"id":"btree-wal-is-physical-redo-only","text":"The B-tree WAL in `btree.py` stores full after-image page data (physical WAL) and supports only redo recovery; there is no undo capability","truth_value":"IN","source":"entries/2026/05/29/topic-write-ahead-logging-fsync-ordering.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"btree-wal-is-physical-redo-only","truth_value":"IN","reason":"premise"}]}}