May 2026 highlights: delivered two high-impact fixes across Prefect and Airflow that strengthen data integrity, security, and operational reliability. In Prefect, cycle detection was added to the block_document graph to prevent self-references and cyclic dependencies (commit 2d695548d22e87e29a5829234ced11ddd5ce2a3f). In Airflow, temporary files used by GoogleBidManagerDownloadReportOperator are now cleaned up reliably with a try/finally pattern, ensuring deletion on both success and failure paths and improved logging for cleanup issues (commit a7174b5bc6dcffabeb8ab72e2256c7cfe9035a13). These changes reduce risk of data integrity problems and unauthorized data remnants on workers, improve resource management, and enhance observability. Technologies demonstrated include Python graph validation, NamedTemporaryFile handling, cross-platform cleanup considerations (Windows), and robust logging for cleanup flows.