Description
Turn your PostgreSQL database into a smart, AI-accessible control center with this n8n-powered MCP server. Designed for HR, Sales, Payroll, Inventory, and more—this server securely exposes select, insert, and update operations to any compatible AI agent through MCP tool protocols.
🔹 How It Works:
✅ 🧠 MCP Trigger – Listens for Server-Sent Events (SSE) and routes incoming tool requests ✅ 🛠️ 2 PostgreSQL Tools – Built-in read-only queries using native PostgreSQL nodes ✅ 🔁 3 Custom Tools – Trigger a single execution workflow that dynamically routes the query (select, insert, update) via Switch node ✅ 🔐 Parameterized Input – Custom tools only accept structured inputs (not raw SQL), which are converted into SQL inside n8n ✅ 🔄 Query Handling – Each tool executes the final SQL query using the PostgreSQL node, and sends the response back to the MCP client
🎯 Who This Template Is For:
✅ Internal Teams – HR, Finance, Inventory, or Sales teams needing agent-powered query access ✅ DevOps & Data Engineers – Wanting safe AI access to live databases without opening up raw SQL ✅ AI Builders – Developing AI agents or copilots that require structured access to operational databases ✅ Startups – Automating internal tools and admin dashboards with natural language
⚙️ Setup Instructions:
✅ Set Up PostgreSQL – Connect to any hosted DB (e.g. Supabase, Railway, or self-hosted PostgreSQL) ✅ Configure the MCP Trigger – Generates the SSE endpoint URL for AI tools ✅ Link Custom Workflows – Use Execute Workflow nodes to modularize insert/select/update operations ✅ Restrict Inputs – Add schema validation using IF and Switch nodes to filter incoming tool parameters ✅ Test with Queries – Try prompts like “Insert John into the employees table if he doesn’t exist”
📎 Tips & Notes:
✅ Use input schemas to restrict agent behavior and avoid unsafe or unintended SQL ✅ Add credentials/auth headers before production rollout to prevent unauthorized access ✅ Extend with more workflows for delete, join queries, or summaries across tables ✅ Log agent interactions in an audit table for monitoring or security reviews ✅ Use LangChain, CrewAI, or n8n Agent nodes as your MCP client
🔐 Your Data, Your Control—Now Agent-Ready With this PostgreSQL MCP Server, you give your AI agents a clean, secure way to interact with business-critical data—while you stay in full control of logic, access, and structure.
Link : https://lovable.dev/projects/e2f183e2-71c6-4a52-9159-4c9e7ee17635
