The workflow JSON

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Download .json

{
  "name": "04b Outreach: Approval Webhook",
  "nodes": [
    {
      "parameters": {
        "httpMethod": "GET",
        "path": "outreach-decision",
        "responseMode": "responseNode",
        "options": {}
      },
      "id": "wh-decision",
      "name": "Approve/Reject Link",
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 2,
      "position": [
        240,
        300
      ]
    },
    {
      "parameters": {
        "jsCode": "// Validate the decision and build the state-transition SQL.\nconst token = ($json.query && $json.query.token) || '';\nlet decision = ($json.query && $json.query.decision) || '';\nif (!['approved','rejected'].includes(decision)) decision = 'rejected';\nif (!/^[0-9a-fA-F-]{36}$/.test(token)) {\n  return [{ json: { ok: false, message: 'Invalid token', query: 'SELECT 1 WHERE false;' } }];\n}\nconst outreachStatus = decision === 'approved' ? 'approved' : 'cancelled';\nconst query = `WITH a AS (UPDATE app.approvals SET status = '${decision}', decided_at = now() WHERE token = '${token}' AND status = 'pending' RETURNING entity_id) UPDATE app.outreach o SET status = '${outreachStatus}', approved_at = CASE WHEN '${decision}' = 'approved' THEN now() ELSE approved_at END FROM a WHERE o.id = a.entity_id RETURNING o.id;`;\nreturn [{ json: { ok: true, decision, query } }];"
      },
      "id": "code-decide",
      "name": "Build Decision SQL",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [
        460,
        300
      ]
    },
    {
      "parameters": {
        "operation": "executeQuery",
        "query": "={{ $json.query }}",
        "options": {}
      },
      "id": "pg-apply",
      "name": "Apply Decision",
      "type": "n8n-nodes-base.postgres",
      "typeVersion": 2.5,
      "position": [
        680,
        300
      ],
      "credentials": {
        "postgres": {
          "name": "<your credential>"
        }
      }
    },
    {
      "parameters": {
        "respondWith": "text",
        "responseBody": "={{ ($('Apply Decision').first().json.id ? 'Decision recorded: ' + $('Build Decision SQL').first().json.decision + '. You can close this tab.' : 'No matching pending approval \u2014 already decided or invalid token.') }}",
        "options": {}
      },
      "id": "resp",
      "name": "Respond",
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1,
      "position": [
        900,
        300
      ]
    }
  ],
  "connections": {
    "Approve/Reject Link": {
      "main": [
        [
          {
            "node": "Build Decision SQL",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Build Decision SQL": {
      "main": [
        [
          {
            "node": "Apply Decision",
            "type": "main",
            "index": 0
          }
        ]
      ]
    },
    "Apply Decision": {
      "main": [
        [
          {
            "node": "Respond",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "active": false,
  "settings": {
    "executionOrder": "v1"
  }
}