Stop Paying for Vector Databases: How to Build AI Search in Postgres

I see developers trying to build "AI Chatbots" that know about their specific company data. They want the AI to read their PDFs, their internal wikis, or their past customer tickets, and answer questions based on that data. This technique is called RAG (Retrieval-Augmented Generation). When the AI hype first started, developers thought they had to pay for expensive, dedicated "Vector Databases" like Pinecone or Milvus to do this. They added a massive layer of complexity to their stack just to some AI data. In 2026, the Rails way to do this is much simpler. You just use Postgre.