About This Guide In the previous guide, Building a RAG System from Scratch with pgvector and Gemini , we implemented a RAG system from scratch using pgvector and Gemini, then extended it through Tool Use, AI Agents, MCP, and cloud deployment. This guide is the sequel. It takes you from "building a system that works" to "making a system that works in production" . [Previous Guide] RAG → Tool Use → AI Agents → MCP → Render × Supabase deployment [This Guide] Evals → Observabil...