Documentation and technical improvements

This issue tracks ongoing technical improvements to the Data2Evidence (D2E) platform to ensure it remains robust, maintainable, and adaptable to evolving needs. The planned work focuses on general modernization of the technology stack, deployment and infrastructure enhancements, expanded database support, backend optimization, and comprehensive documentation updates. By addressing these areas, D2E will provide a more secure, performant, and user-friendly experience for both end users and contributors.

Key focus areas include:

• Modernizing the technology stack through regular upgrades of libraries, frameworks, and core components across the frontend and backend, ensuring improved security, performance, and long-term maintainability.

• Enhancing deployment and infrastructure options (e.g., Kubernetes support via Helm charts) for more scalable and reproducible platform operation.

• Expanding multi-database support—including BigQuery integration, flexible execution strategies, and the ability to add proprietary database drivers—to accommodate a wider range of research and enterprise requirements.

• Unifying and optimizing backend service APIs and workflows for greater efficiency and consistency (e.g., aligning concept search clients and evaluating Trex SQL for Hades execution).

• Improving and expanding user, developer, API, and administrative documentation to streamline onboarding, system administration, and integration efforts.

No files, tests, or entry points are named. Start by inventorying the existing deployment, database, backend API, frontend, and documentation areas against the listed focus areas, then split the work into scoped changes. Done requires separately verifiable modernization, infrastructure, database, API, and documentation improvements.