How to Build Smarter RAG Database Agents (n8n)

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Creating read-only users on Supabase/Postgres: https://docs.visuo.ai/guides/supabase

Chapters:
0:00 - Overview
1:00 - Demo
2:44 - NLQ explained
4:28 - Building the Agent
5:50 - The System Prompt
9:01 - Creating the Schema View
10:07 - Advanced Filtering
11:06 - Optimizations: Hardcoding Schema
11:52 - Approach: Creating Views
14:48 - Approach: Prepared Queries
17:51 - Security & SQL Injection
18:55 - Combining with RAG

In this video, you'll learn how to create a powerful AI agent that can intelligently and securely query relational databases using natural language. The tutorial goes far beyond typical SEO agent demos, diving deep into database structure understanding, SQL query generation, and real-world deployment techniques.

The walkthrough starts with a working demo using a Supabase-hosted Postgres database, demonstrating how the AI agent constructs complex SQL queries on the fly. You'll see how it interprets relationships between tables like customers, orders, and products without any hardcoded schema, using a specialized tool to dynamically retrieve and process schema metadata.

I'll also show you how to secure your AI agent against SQL injection. The video covers multiple architectural approaches for integrating natural language query (NLQ) into your systems, ranging from using dynamic tools for schema context to optimizing with static views and predefined query nodes for more deterministic, secure setups.

You'll also learn how to enhance the system prompt to guide the AI in building accurate and efficient SQL queries, and why providing context through views or hardcoded schemas can drastically improve both speed and reliability. Several techniques are demonstrated to ensure the AI handles distinct value filtering, and joins correctly, making it highly robust even in normalized or complex schemas.

In the latter part of the video, you’ll see how to build flattened database views to simplify querying and allow cheaper AI models to perform well. Alternatively, the tutorial explains how to limit the AI's capabilities to only specific prepared queries for added safety and reliability.

For advanced use cases, the video explores hybrid agentic RAG setups, combining relational querying with vector or graph database lookups. This enables the AI to seamlessly handle both structured and unstructured information in the same agent workflow.