DEV Community Post Details SQL-Only Database Testing Method for Pure DB Logic

A technical article published in May 2026 on DEV Community outlines a database-side testing approach called 'sql-only-trace,' designed for engineers working with pure database logic that application-layer tests cannot reach. The post is the ninth and final entry in the 'Trace Lock — Governance Notes from AI Pair-Programming' series. It addresses four scenarios where standard unit test frameworks like Vitest or Jest fall short, including complex stored procedures, multi-table inventory invariants, row-level security policy boundaries, and function overload behavior. The method replaces conventional JavaScript trace test files with SQL-based equivalents that run directly inside the database, using PostgreSQL-specific mechanics such as DO blocks, set_config, and RAISE EXCEPTION. The author's environment uses Vue 3, Vite, Vitest, Supabase with PostgreSQL, and Node.js, though the article also notes equivalent approaches for MySQL, SQLite, and MongoDB.