Build your own PostgreSQL MCP server

This n8n demonstrates how to build a simple PostgreSQL MCP server to manage your PostgreSQL database such as HR, Payroll, Sale, Inventory and More! This MCP example is based off an official MCP reference implementation which can be found here -https://github.com/modelcontextprotocol/servers/tree/main/src/postgres How it works A MCP server trigger is used and connected to 5 tools: 2 postgreSQL and 3 custom workflow. The 2 postgreSQL tools are simple read-only queries and as such, the postgreSQL tool can be simply used. The 3 custom workflow tools are used for select, insert and update queries as these are operations which require a bit more discretion. Whilst it may be easier to allow the age

Help me set up the n8n workflow "Build your own PostgreSQL MCP server" (https://n8n.io/workflows/3631). It uses: Postgres, Call n8n Workflow Tool. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.