How /search and /ask Work: Local Hybrid RAG with ChromaDB + SQLite FTS5

This is the second article in a five-part series about building Llamail, a private local AI email agent. In the first article, I showed the whole system behind it: Gmail, Telegram, n8n, FastAPI, llama.cpp, SQLite, and ChromaDB. From the user's side it looked simple: type /search , get useful hits; ask a follow-up question in plain English, get an answer back; do it all from a phone. Quite convenient actually. This article is about how all of that works under the hood. It will be interesting so l