Backend

Backend uses FastAPI, supports multi-tenant auth, and integrates DS-STAR, Text-to-SQL, and PostgreSQL, Redis, Qdrant, Ollama on elin. Critical components include question_router, findings_generator, and document extractors. It manages project data, files, and analysis API, with fallback mechanisms for Qdrant. It currently uses DuckDBService; after migration, it will replace this with PgDataService to manage data in PostgreSQL.