Pgtestdb's template cloning approach to testing is fast

Pgtestdb, a Go/Postgres testing package, uses Postgres template databases to clone test databases extremely quickly—achieving setup times around 100ms, comparable to schema-based testing approaches. While pgtestdb's cloning method is fast enough to be practical, River's schema-based testing approach with schema pooling and reuse optimization achieves 3.5x faster overall test suite execution by reusing cleaned schemas across test cases rather than creating new ones each time.