Greg Rundlett focused on backend development and database management for the SemanticMediaWiki repository, delivering a cross-version compatibility fix for the SMW Export Controller. He addressed deprecation issues by replacing the outdated wfGetDB() function with a static getDBHandle() method, ensuring reliable database access across multiple MediaWiki versions. Greg utilized PHP and leveraged MediaWikiServices to obtain replica database handles for newer versions, while implementing a fallback to DB_REPLICA for older deployments. This approach reduced runtime database errors during exports and improved stability in multi-version environments, demonstrating careful attention to maintainability and robust API integration within a complex, evolving codebase.