Monitoring and alerting

{
  "id": "34",
  "name": "Monitoring and alerting",
  "nodes": [
    {
      "name": "Cron",
      "type": "n8n-nodes-base.cron",
      "position": [
        250,
        200
      ],
      "parameters": {},
      "typeVersion": 1
    },
    {
      "name": "Postgres",
      "type": "n8n-nodes-base.postgres",
      "position": [
        450,
        200
      ],
      "parameters": {
        "query": "SELECT * FROM n8n WHERE value > 70 AND notification = false;",
        "operation": "executeQuery"
      },
      "credentials": {
        "postgres": "Postgres"
      },
      "typeVersion": 1
    },
    {
      "name": "Twilio",
      "type": "n8n-nodes-base.twilio",
      "position": [
        650,
        200
      ],
      "parameters": {
        "to": "",
        "from": "",
        "message": "=🚨 The Sensor ({{$node[\"Postgres\"].json[\"sensor_id\"]}}) showed a reading of {{$node[\"Postgres\"].json[\"value\"]}}."
      },
      "credentials": {
        "twilioApi": "Twilio"
     ...