Developed a custom API endpoint for the sapcc/nova repository, enabling efficient retrieval of all instance UUIDs by querying only the UUID column from the database. This approach reduced both database load and data transfer, directly supporting performance and scalability objectives. The endpoint was secured through policy management, ensuring that access to sensitive identifiers adhered to organizational security requirements. Work involved API development and database interaction using Python, with careful attention to OpenStack integration and compliance with existing access controls. The solution addressed the need for targeted data access, optimizing resource usage while maintaining robust security and aligning with operational best practices.