Fully open-source RAG with pgvector + pgai + Ollama, and ragvitals watching for drift

Companion code: MukundaKatta/ragvitals-gemma-demo . The pgai + Ollama path is the demo/pgai_ollama_run.py entry point. If you have ever shipped RAG to production, you know the discovery: the day you swap a model, change an embedder, or re-index the corpus, something will move that you did not expect . Faithfulness drops. Retrieval recall sags. Query intent shifts under your nose. Most of the time you find out from a support ticket, not a dashboard. The point of this post is to show that you can