Adding UUID Support to Rust Framework Runique Exposed Three Hidden Database Bugs

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A developer maintaining Runique, a Django-inspired Rust web framework built on Axum and SeaORM, set out to add UUID primary key support alongside existing integer options. The work required running tests against three separate database backends — PostgreSQL, SQLite, and others — for the first time, rather than relying on a single cargo test run. This revealed three pre-existing bugs: a misplaced USING clause in PostgreSQL ALTER TABLE statements, a case-mismatch error in enum renames due to inconsistent quoting, and a runtime panic in SQLite caused by unsupported column modification syntax. None of the bugs were related to UUID support itself; they had simply gone undetected because generated SQL had never been validated against real database engines. The developer concluded that passing unit tests do not guarantee correctness unless the actual SQL output is verified against live backends.

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