This presentation provides an update on recent and ongoing developments of the ESA TAP service. The work focuses on evolving the backend architecture and service behaviour to better support higher workloads in a multi-user environment, with the goal of improving scalability, performance, and operational robustness.

Key developments include the introduction of a shared Redis-based layer to improve performance on a multi tap environment, enhanced mechanisms for handling user-specific data within shared datasets, and the integration of Keycloak to support robust authentication and secure token-based service interactions. These changes aim to strengthen multi-user support while preserving interoperability and efficient shared resource usage in line with IVOA TAP/UWS usage patterns.

The talk also presents optimisation efforts in the management of job and owners metadata, improving efficiency, traceability, and observability for large-scale asynchronous workloads. Together, these improvements support more reliable and scalable TAP service architecture.

The presentation concludes with lessons learned from implementing these changes, and discusses open design questions and trade-offs relevant to the continued evolution of TAP services within the IVOA ecosystem.