UUID v4 and v7: Collision Incidents and Performance BenchmarksMay 29, 2026·974 words·5 minsPostgreSQL内功修炼 PostgreSQL UUID 性能 索引A real UUID v4 collision on HackerNews sparked 479 upvotes and 347 comments. Combined with UUID v4 vs v7 performance benchmarks on PG 16, here's how to choose.