{"id":"btree-delete-cleanup-depth2-only","text":"Empty leaf cleanup only triggers when the current internal node is at depth 2 (direct parent of leaves) and the empty child is not the leftmost; empty leaves at depth > 2 or at index 0 are silently left in place","truth_value":"IN","source":"entries/2026/05/28/b-tree-storage-engine-btree-_delete.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"btree-delete-cleanup-depth2-only","truth_value":"IN","reason":"premise"}]}}