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We’ll be using Postgres as the database and Twilio for sending SMS alerts using n8n workflows. We'll use a Cron node to trigger the workflow every minute, a Function node to generate timestamp and a random value, and a Postgres node to insert the generated data to the database. In case of a value that crosses the specified threshold, it will trigger an alert with an SMS. In this tutorial, create a table called "n8n" for sensor readings.