SheetMind AI is a production-grade, fully local Retrieval-Augmented Generation (RAG) system designed to intelligently query and analyze large Excel datasets using natural language. This project demonstrates how modern AI systems can be integrated with structured business data to create powerful, privacy-first analytics tools, without relying on cloud APIs or external services. The entire system runs locally using PostgreSQL, pgvector, FastAPI, Next.js, and Ollama models, making it suitable for enterprise environments where data privacy, cost control, and offline capability are critical.