{"id":"tree-height-monotonically-increases","text":"Since neither the reference implementation nor PostgreSQL merges internal nodes on delete, tree height only grows (on root splits) and never shrinks, even under heavy deletion","truth_value":"IN","source":"entries/2026/05/28/topic-postgres-nbtree-lazy-deletion.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"tree-height-monotonically-increases","truth_value":"IN","reason":"premise"}]}}