# Postgres data freshness monitoring: n8n workflow template

> Started by a clock, and works across Postgres. 9 steps, 1 loop or waits: a working afternoon to understand properly.

Source: https://millionrounds.com/workflow/postgres-data-freshness-monitoring (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Alerts and monitoring](https://millionrounds.com/workflows?category=Alerts+and+monitoring#library)

# Postgres data freshness monitoring

Started by a clock, and works across Postgres. 9 steps, 1 loop or waits: a working afternoon to understand properly.

Medium

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fpostgres-data-freshness-monitoring)

**9 steps** Medium: a working afternoon

**0** Branches: places the flow splits

**1** Loop or waits

**1** Service it connects to

## The flow

Starts it 1 Logic 7 Service 1

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

- 1 **Schedule Trigger** Schedule trigger *Starts it*
- 2 **Produce tables + date columns** Code *Logic*
- 3 **Loop Over Items** Split In Batches *Logic*
- 4 **Remove fresh tables** Filter *Logic*
- 5 **Get most recent row from table** Postgres *Service*
- 6 **Aggregate Stale Tables** Aggregate *Logic*
- 7 **Calculate lag** Date Time *Logic*
- 8 **Send alerts** Execute Workflow *Logic*
- 9 **Add back table name** Set *Logic*

## How it's built

- **Starts on:** A clock
- **Steps:** 9, 1 loop or waits
- **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 a clock.

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. 9 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 9 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fpostgres-data-freshness-monitoring)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Postgres](https://millionrounds.com/workflows?service=Postgres#library)

## Workflows like it

Also alerts and monitoring, with the same services where possible, closest in size first.

- [**Fetch BMKG API for Telegram notifications with Postgres** 8 steps · Postgres, Telegram](https://millionrounds.com/workflow/tangkap-api-bmkg-untuk-notifikasi-telegram-with-postgres)
- [**Monitor SQL data quality and send email reports** 10 steps · Gmail, Google Sheets](https://millionrounds.com/workflow/monitor-sql-data-quality-and-send-email-reports)
- [**This is the best workflow ever created by the best creator ever** 8 steps · Linear, Mattermost](https://millionrounds.com/workflow/this-is-the-best-workflow-ever-created-by-the-best-creator-e)
- [**Monitor Twitter accounts & generate intelligence summaries** 11 steps · calls a model · Postgres, RSS](https://millionrounds.com/workflow/monitor-twitter-accounts-and-generate-intelligence-summaries)
- [**Postgres database size alert** 6 steps · Email, Postgres](https://millionrounds.com/workflow/postgres-database-size-alert)
- [**Postgres health check** 6 steps · Email, Postgres](https://millionrounds.com/workflow/postgres-health-check)