{
  "workflow": {
    "id": 357,
    "name": "Send SMS alerts based on database queries (Twilio and Postgres)",
    "views": 3342,
    "recentViews": 0,
    "totalViews": 3342,
    "createdAt": "2020-05-05T08:20:54.347Z",
    "description": "This workflow automatically queries a Postgres database to find outlier readings for which SMS notifications have not been sent.\nThis is Workflow 2 in the blog tutorial [Database activity monitoring and alerting](https://blog.n8n.io/database-monitoring-and-alerting-with-n8n/).\n\n## Prerequisites\n\n- A Postgres database set up and [credentials](https://docs.n8n.io/integrations/credentials/postgres/)\n- A Twilio account and [credentials](https://docs.n8n.io/integrations/credentials/twilio/)\n\n## Nodes\n\n- [Cron node](https://docs.n8n.io/integrations/core-nodes/n8n-nodes-base.cron/) triggers the workflow every minute, so the database is queried at regular intervals.\n- [Postgres nodes](https://docs.n8n.io/integrations/nodes/n8n-nodes-base.postgres/) extract values from, and update values in the database.\n- [Twilio node](https://docs.n8n.io/integrations/nodes/n8n-nodes-base.twilio/) sends an alert SMS about the outlier reading to a specified phone number.\n- [Set node](https://docs.n8n.io/integrations/core-nodes/n8n-nodes-base.set/) sets the notification value to *true*.",
    "workflow": {
      "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"
          },
          "typeVersion": 1
        },
        {
          "name": "Set",
          "type": "n8n-nodes-base.set",
          "position": [
            850,
            200
          ],
          "parameters": {
            "values": {
              "number": [
                {
                  "name": "id",
                  "value": "={{$node[\"Postgres\"].json[\"id\"]}}"
                }
              ],
              "boolean": [
                {
                  "name": "notification",
                  "value": true
                }
              ]
            },
            "options": {},
            "keepOnlySet": true
          },
          "typeVersion": 1
        },
        {
          "name": "Postgres1",
          "type": "n8n-nodes-base.postgres",
          "position": [
            1050,
            200
          ],
          "parameters": {
            "table": "n8n",
            "columns": "notification",
            "operation": "update"
          },
          "credentials": {
            "postgres": "Postgres"
          },
          "typeVersion": 1
        }
      ],
      "active": false,
      "settings": {},
      "connections": {
        "Set": {
          "main": [
            [
              {
                "node": "Postgres1",
                "type": "main",
                "index": 0
              }
            ]
          ]
        },
        "Cron": {
          "main": [
            [
              {
                "node": "Postgres",
                "type": "main",
                "index": 0
              }
            ]
          ]
        },
        "Twilio": {
          "main": [
            [
              {
                "node": "Set",
                "type": "main",
                "index": 0
              }
            ]
          ]
        },
        "Postgres": {
          "main": [
            [
              {
                "node": "Twilio",
                "type": "main",
                "index": 0
              }
            ]
          ]
        }
      }
    },
    "lastUpdatedBy": null,
    "workflowInfo": {
      "nodeCount": 5,
      "nodeTypes": {
        "n8n-nodes-base.set": {
          "count": 1
        },
        "n8n-nodes-base.cron": {
          "count": 1
        },
        "n8n-nodes-base.twilio": {
          "count": 1
        },
        "n8n-nodes-base.postgres": {
          "count": 2
        }
      }
    },
    "status": "published",
    "user": {
      "name": "tanaypant",
      "username": "tanay1337",
      "bio": null,
      "verified": true,
      "links": [],
      "avatar": "https://gravatar.com/avatar/0cef0266ab81fd7159b2d3d681aeb30fe1953b287de10f3e6d60e58d866ad0b0?r=pg&d=retro&size=200"
    },
    "nodes": [
      {
        "id": 7,
        "icon": "fa:clock",
        "name": "n8n-nodes-base.cron",
        "codex": {
          "data": {
            "alias": [
              "Time",
              "Scheduler",
              "Polling",
              "Cron",
              "Interval"
            ],
            "details": "The Cron node uses Cron under the hood - a time-based job scheduler in Unix-like computer operating systems. Use this node when you want to trigger workflows periodically, especially in more complex scenarios like \"every Tuesday at 9 am\" or \"Weekdays\".",
            "resources": {
              "generic": [
                {
                  "url": "https://n8n.io/blog/2021-goals-level-up-your-vocabulary-with-vonage-and-n8n/",
                  "icon": "🎯",
                  "label": "2021 Goals: Level Up Your Vocabulary With Vonage and n8n"
                },
                {
                  "url": "https://n8n.io/blog/love-at-first-sight-ricardos-n8n-journey/",
                  "icon": "❤️",
                  "label": "Love at first sight: Ricardo’s n8n journey"
                },
                {
                  "url": "https://n8n.io/blog/2021-the-year-to-automate-the-new-you-with-n8n/",
                  "icon": "☀️",
                  "label": "2021: The Year to Automate the New You with n8n"
                },
                {
                  "url": "https://n8n.io/blog/why-business-process-automation-with-n8n-can-change-your-daily-life/",
                  "icon": "🧬",
                  "label": "Why business process automation with n8n can change your daily life"
                },
                {
                  "url": "https://n8n.io/blog/why-i-chose-n8n-over-zapier-in-2020/",
                  "icon": "😍",
                  "label": "Why I chose n8n over Zapier in 2020"
                },
                {
                  "url": "https://n8n.io/blog/how-to-host-virtual-coffee-breaks-with-n8n/",
                  "icon": "☕️",
                  "label": "How to host virtual coffee breaks with n8n"
                },
                {
                  "url": "https://n8n.io/blog/automatically-pulling-and-visualizing-data-with-n8n/",
                  "icon": "📈",
                  "label": "Automatically pulling and visualizing data with n8n"
                },
                {
                  "url": "https://n8n.io/blog/how-to-sync-data-between-two-systems/",
                  "icon": "🏬",
                  "label": "How to synchronize data between two systems (one-way vs. two-way sync"
                },
                {
                  "url": "https://n8n.io/blog/database-monitoring-and-alerting-with-n8n/",
                  "icon": "📡",
                  "label": "Database Monitoring and Alerting with n8n"
                },
                {
                  "url": "https://n8n.io/blog/automate-your-data-processing-pipeline-in-9-steps-with-n8n/",
                  "icon": "⚙️",
                  "label": "Automate your data processing pipeline in 9 steps"
                },
                {
                  "url": "https://n8n.io/blog/5-tasks-you-can-automate-with-notion-api/",
                  "icon": "⚡️",
                  "label": "5 tasks you can automate with the new Notion API "
                },
                {
                  "url": "https://n8n.io/blog/world-poetry-day-workflow/",
                  "icon": "📜",
                  "label": "Celebrating World Poetry Day with a daily poem in Telegram"
                },
                {
                  "url": "https://n8n.io/blog/automate-google-apps-for-productivity/",
                  "icon": "💡",
                  "label": "15 Google apps you can combine and automate to increase productivity"
                },
                {
                  "url": "https://n8n.io/blog/automate-designs-with-bannerbear-and-n8n/",
                  "icon": "🎨",
                  "label": "Automate Designs with Bannerbear and n8n"
                },
                {
                  "url": "https://n8n.io/blog/tracking-time-spent-in-meetings-with-google-calendar-twilio-and-n8n/",
                  "icon": "🗓",
                  "label": "Tracking Time Spent in Meetings With Google Calendar, Twilio, and n8n"
                },
                {
                  "url": "https://n8n.io/blog/creating-error-workflows-in-n8n/",
                  "icon": "🌪",
                  "label": "Creating Error Workflows in n8n"
                },
                {
                  "url": "https://n8n.io/blog/using-automation-to-boost-productivity-in-the-workplace/",
                  "icon": "💪",
                  "label": "Using Automation to Boost Productivity in the Workplace"
                },
                {
                  "url": "https://n8n.io/blog/why-this-product-manager-loves-workflow-automation-with-n8n/",
                  "icon": "🧠",
                  "label": "Why this Product Manager loves workflow automation with n8n"
                },
                {
                  "url": "https://n8n.io/blog/sending-automated-congratulations-with-google-sheets-twilio-and-n8n/",
                  "icon": "🙌",
                  "label": "Sending Automated Congratulations with Google Sheets, Twilio, and n8n "
                },
                {
                  "url": "https://n8n.io/blog/a-low-code-bitcoin-ticker-built-with-questdb-and-n8n-io/",
                  "icon": "📈",
                  "label": "A low-code bitcoin ticker built with QuestDB and n8n.io"
                },
                {
                  "url": "https://n8n.io/blog/benefits-of-automation-and-n8n-an-interview-with-hubspots-hugh-durkin/",
                  "icon": "🎖",
                  "label": "Benefits of automation and n8n: An interview with HubSpot's Hugh Durkin"
                },
                {
                  "url": "https://n8n.io/blog/creating-scheduled-text-affirmations-with-n8n/",
                  "icon": "🤟",
                  "label": "Creating scheduled text affirmations with n8n"
                },
                {
                  "url": "https://n8n.io/blog/how-goomer-automated-their-operations-with-over-200-n8n-workflows/",
                  "icon": "🛵",
                  "label": "How Goomer automated their operations with over 200 n8n workflows"
                }
              ],
              "primaryDocumentation": [
                {
                  "url": "https://docs.n8n.io/integrations/builtin/core-nodes/n8n-nodes-base.scheduletrigger/"
                }
              ]
            },
            "categories": [
              "Core Nodes"
            ],
            "nodeVersion": "1.0",
            "codexVersion": "1.0",
            "subcategories": {
              "Core Nodes": [
                "Flow"
              ]
            }
          }
        },
        "group": "[\"trigger\",\"schedule\"]",
        "defaults": {
          "name": "Cron",
          "color": "#29a568"
        },
        "iconData": {
          "icon": "clock",
          "type": "icon"
        },
        "displayName": "Cron",
        "typeVersion": 1,
        "nodeCategories": [
          {
            "id": 9,
            "name": "Core Nodes"
          }
        ]
      },
      {
        "id": 30,
        "icon": "file:postgres.svg",
        "name": "n8n-nodes-base.postgres",
        "codex": {
          "data": {
            "resources": {
              "generic": [
                {
                  "url": "https://n8n.io/blog/love-at-first-sight-ricardos-n8n-journey/",
                  "icon": "❤️",
                  "label": "Love at first sight: Ricardo’s n8n journey"
                },
                {
                  "url": "https://n8n.io/blog/why-i-chose-n8n-over-zapier-in-2020/",
                  "icon": "😍",
                  "label": "Why I chose n8n over Zapier in 2020"
                },
                {
                  "url": "https://n8n.io/blog/database-monitoring-and-alerting-with-n8n/",
                  "icon": "📡",
                  "label": "Database Monitoring and Alerting with n8n"
                },
                {
                  "url": "https://n8n.io/blog/running-n8n-on-ships-an-interview-with-maranics/",
                  "icon": "🛳",
                  "label": "Running n8n on ships: An interview with Maranics"
                },
                {
                  "url": "https://n8n.io/blog/automate-your-data-processing-pipeline-in-9-steps-with-n8n/",
                  "icon": "⚙️",
                  "label": "Automate your data processing pipeline in 9 steps"
                },
                {
                  "url": "https://n8n.io/blog/how-honest-burgers-use-automation-to-save-100k-per-year/",
                  "icon": "🍔",
                  "label": "How Honest Burgers Use Automation to Save $100k per year"
                }
              ],
              "primaryDocumentation": [
                {
                  "url": "https://docs.n8n.io/integrations/builtin/app-nodes/n8n-nodes-base.postgres/"
                }
              ],
              "credentialDocumentation": [
                {
                  "url": "https://docs.n8n.io/integrations/builtin/credentials/postgres/"
                }
              ]
            },
            "categories": [
              "Development",
              "Data & Storage"
            ],
            "nodeVersion": "1.0",
            "codexVersion": "1.0"
          }
        },
        "group": "[\"input\"]",
        "defaults": {
          "name": "Postgres"
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