During February 2026, Vimal Prakash focused on consolidating correctness fixes within the tursodatabase/turso engine, addressing subtle issues in IN(subquery) evaluation and NULL handling. He improved the engine’s robustness by implementing precise NULL semantics for subqueries and ensuring that ungrouped aggregates returned NULL when appropriate, preventing potential data corruption. Vimal also refined the handling of NOT NULL columns by adjusting the evaluation order to emit IsNull before NotFound or Found, which enhanced correctness when NullRow applied. His work, primarily using Rust and SQL, included adding targeted regression tests, reflecting a deep understanding of database management and a methodical approach to stability.