Automation library · Integrations

Prevent duplicate webhook processing with Data Tables

Started by another system calling it, and works across n8n data table. 10 steps, 1 branch: a working afternoon to understand properly.

Medium

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

The flow

Starts it 1Logic 5Service 4

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

  1. 1Receive Webhook EventWebhookStarts it
  2. 2Normalize EventCodeLogic
  3. 3Configure GuardCodeLogic
  4. 4Find Existing KeyData TableService
  5. 5Evaluate IdempotencyCodeLogic
  6. 6Route DecisionSwitchLogic
  7. 7Create Ledger RecordData TableService
  8. 8Record DuplicateData TableService
  9. 9Refresh Expired RecordData TableService
  10. 10Build Guard ResultCodeLogic

How it's built

Starts on
Another system calling it
Steps
10, with 1 branch
Size
Medium: a working afternoon
Connects to
n8n data table
Model
None. This is plumbing, not judgement

Questions

What does it need to run?

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

What starts it?

It starts on another system calling it.

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. 10 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 10 steps before you point it at anything that matters.