Automation library · Setup and learning

Build your own PostgreSQL MCP server

Started by an event in a connected app, and works across Postgres. 11 steps, 1 branch: a working afternoon to understand properly.

Medium

11 stepsMedium: a working afternoon
1Branch: places the flow splits
0Loops or waits
1Service it connects to

The flow

Starts it 2Model 3Logic 1Service 5

The steps in the order they run, from what starts it.

  1. 1GetTableSchemaPostgres ToolService
  2. 2ListTablesPostgres ToolService
  3. 3When Executed by Another WorkflowExecute Workflow triggerStarts it
  4. 4CreateTableRecordsTool WorkflowModel
  5. 5UpdateTableRecordsTool WorkflowModel
  6. 6ReadTableRowsTool WorkflowModel
  7. 7PostgreSQL MCP ServerMcp triggerStarts it
  8. 8OperationSwitchLogic
  9. 9ReadTableRecordPostgresService
  10. 10CreateTableRecordPostgresService
  11. 11UpdateTableRecordPostgresService

How it's built

Starts on
An event in a connected app
Steps
11, with 1 branch
Size
Medium: a working afternoon
Connects to
Postgres
Model
None. This is plumbing, not judgement

Questions

What does it need to run?

An n8n account, plus your own Postgres account. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an event in a connected app.

Does it use AI?

No. Every step is fixed logic or a call to a service, so it does the same thing every time.

How long does it take to set up?

Plan an afternoon. 11 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

Before you run it

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 11 steps before you point it at anything that matters.