During June 2025, Duncan Smart focused on enhancing the security and correctness of SQL Server migrations in the dotnet/efcore repository. He addressed a critical bug by implementing QUOTENAME-based quoting in dynamic SQL generation, ensuring that object names with special characters are handled safely and preventing potential SQL injection vulnerabilities. This solution was applied across various migration scenarios, including temporal tables, default constraints, and filegroup operations. Working primarily with C# and SQL, Duncan leveraged his expertise in code refactoring and database migrations to deliver a targeted, well-documented fix that improved the reliability of EF Core’s migration infrastructure.