{"id":"btree-impl-asymmetric-split-vs-merge","text":"The reference implementation fully propagates splits upward through `_insert`'s return value but swallows the `'empty'` signal in `_delete` after one level of cleanup, making insertion structurally complete but deletion structurally incomplete","truth_value":"IN","source":"entries/2026/05/28/topic-postgres-nbtree-lazy-deletion.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"btree-impl-asymmetric-split-vs-merge","truth_value":"IN","reason":"premise"}]}}