{"id":"btree-single-writer","text":"`put` (and `delete`) assume single-threaded access: metadata is re-read after `_insert`/`_delete` without any locking or compare-and-swap, creating a TOCTOU window under concurrent writers.","truth_value":"IN","source":"entries/2026/05/29/b-tree-storage-engine-btree-put.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"btree-single-writer","truth_value":"IN","reason":"premise"}]}}