Flujo de trabajo de aprobación y auditoría de documentos multinivel

• •Cuenta de Google y credenciales de API de Gmail
• •Punto final de HTTP Webhook (n8n generará automáticamente)
• •URL y Clave de API de Supabase
• •Pueden requerirse credenciales de autenticación para la API de destino

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        "content": "## Multi-Level Document Approval & Audit Workflow\n\nThis workflow automates a **document approval process** using Supabase and Gmail.  \n\n---\n\n### Who it’s for\n- Teams that need structured multi-level document approvals.  \n- Companies managing policies, contracts, or proposals.  \n- Anyone using **Supabase** as a backend with approval/audit requirements.  \n\n---\n\n### How it works\n1. **Form Trigger** – A user submits a document via the form.  \n2. **Supabase Integration** – The document is saved in the `documents` table.  \n3. **Workflow Levels** – Fetches the correct approval level from `workflow_levels`.  \n4. **Assign Approvers** – Matches approvers by role from the `users` table.  \n5. **Approval Record** – Creates an `approvals` record with a unique token and expiry.  \n6. **Email Notification** – Sends an email with **Approve / Reject links**.  \n7. **Audit Logs** – Records every approval request in `audit_logs`.  \n\n---\n\n### How to set up\n- Configure your **Supabase credentials**.  \n- Update table IDs (`documents`, `workflow_levels`, `users`, `approvals`, `audit_logs`) to match your schema.  \n- Connect your **Gmail account**.  \n- Adjust approval expiry time (`48h` default).  \n- Deploy and test via the **Form Trigger**.  \n\n---\n\n### Requirements\n- A Supabase project with the listed tables.  \n- A Gmail account connected to n8n.  \n\n---\n\n### Customization\n- Add multiple approval levels by chaining `workflow_levels`.  \n- Replace Gmail with Slack, Teams, or another notification channel.  \n- Adjust audit logging for compliance needs.  \n- Update the endpoint - http://localhost:5678/webhook-test/ based on instance and env (remove test if you run in prod)\n- Handle error in each step pf db interaction.\n\n---\n\n### 1. **Webhook Entry Point**\n- Triggered when an approver clicks the **Approve** or **Reject** link in email.  \n- Captures query parameters:  \n  - `token` (approval token)  \n  - `decision` (approved/rejected)  \n\n---\n\n### 2. **Approval Data Retrieval & Update**\n- Fetch approval record from **Supabase (approvals)** using `token`.  \n- Update approval status:  \n  - `Approved` → moves to next workflow level or final approval.  \n  - `Rejected` → document marked as rejected immediately.  \n- Records `acted_at` timestamp.  \n\n---\n\n### 3. **Decision Check**\n- **IF Node** checks whether the decision is **approved** or **rejected**.  \n- **Reject Path** → Update document status to **Rejected** in `documents`.  \n- **Approve Path** → Continue workflow level progression.  \n\n---\n\n### 4. **Workflow Level Progression**\n- Fetch details of the current workflow level.  \n- Identify the **next level** (`workflow_levels`) based on `level_number`.  \n\n#### ✅ If Next Level Exists:\n- Retrieve approvers by `role_id`.  \n- Generate unique approval tokens.  \n- Create new approval records in `approvals`.  \n- Send **email notifications** with approval/reject links.  \n\n#### ❌ If No Next Level (Last Level):\n- Update document status to **Approved** in `documents`.  \n\n---\n\n### 5. **Audit Logging**\n- Every approval action is logged into `audit_logs` table:  \n  - `document_id`  \n  - `action` (e.g., `approval_sent`, `approved`, `rejected`)  \n  - `actor_email` (system/approver)  \n  - `details` (workflow level, role info, etc.)  \n\n---\n\n## 📨 Email Template\nApproval request email includes **decision links**:  \n\n```html\n<p>Please review the document:</p>\n<p>\n  <a href=\"http://localhost:5678/webhook-test/doc-approval?token={{$json.token}}&decision=approved\">✅ Approve</a> |\n  <a href=\"http://localhost:5678/webhook-test/doc-approval?token={{$json.token}}&decision=rejected\">❌ Reject</a>\n</p>'''\n"
      },
      "typeVersion": 1
    },
    {
      "id": "7db49d0e-c7c5-4423-af60-17e63aa9fea1",
      "name": "Nota adhesiva1",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        -656,
        -224
      ],
      "parameters": {
        "width": 720,
        "height": 1120,
        "content": "## Database Schema\n\n```sql\n-- 1. ROLES: Define roles like Manager, Finance, HR\nCREATE TABLE roles (\n    id SERIAL PRIMARY KEY,\n    name VARCHAR(100) NOT NULL UNIQUE,\n    description TEXT\n);\n\n-- 2. USERS: All approvers (internal + external flag)\nCREATE TABLE users (\n    id SERIAL PRIMARY KEY,\n    name VARCHAR(150) NOT NULL,\n    email VARCHAR(200) NOT NULL UNIQUE,\n    role_id INT REFERENCES roles(id) ON DELETE SET NULL,\n    is_external BOOLEAN DEFAULT FALSE,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);\n\n-- 3. DOCUMENTS: The items that need approval\nCREATE TABLE documents (\n    id SERIAL PRIMARY KEY,\n    title VARCHAR(255) NOT NULL,\n    content TEXT, -- could also just store metadata, file path, or S3 link\n    submitted_by INT REFERENCES users(id) ON DELETE SET NULL,\n    status VARCHAR(50) DEFAULT 'Pending', -- Pending / Approved / Rejected\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,\n    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);\n\n-- 4. WORKFLOW LEVELS: Configure levels & roles\nCREATE TABLE workflow_levels (\n    id SERIAL PRIMARY KEY,\n    level_number INT NOT NULL,\n    role_id INT REFERENCES roles(id) ON DELETE CASCADE,\n    approval_type VARCHAR(20) DEFAULT 'any', -- any / all\n    description TEXT\n);\n\n-- 5. APPROVALS: Tracks individual approval actions\nCREATE TABLE approvals (\n    id SERIAL PRIMARY KEY,\n    document_id INT REFERENCES documents(id) ON DELETE CASCADE,\n    level_id INT REFERENCES workflow_levels(id) ON DELETE CASCADE,\n    approver_id INT REFERENCES users(id) ON DELETE CASCADE,\n    token VARCHAR(255) NOT NULL UNIQUE, -- one-time token for secure link\n    status VARCHAR(20) DEFAULT 'Pending', -- Pending / Approved / Rejected\n    expiry_time TIMESTAMP,\n    acted_at TIMESTAMP\n);\n\n-- 6. AUDIT LOGS (optional, for tracking history)\nCREATE TABLE audit_logs (\n    id SERIAL PRIMARY KEY,\n    document_id INT REFERENCES documents(id) ON DELETE CASCADE,\n    action VARCHAR(50), -- submitted / approved / rejected / escalated\n    actor_email VARCHAR(200),\n    details TEXT,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);\n```"
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      "typeVersion": 1
    },
    {
      "id": "25ef7fca-6462-4806-bf01-d0c552aabae7",
      "name": "Auditoría",
      "type": "n8n-nodes-base.supabase",
      "position": [
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      ],
      "parameters": {
        "tableId": "audit_logs",
        "fieldsUi": {
          "fieldValues": [
            {
              "fieldId": "document_id",
              "fieldValue": "={{ $('get_approval_data').item.json.document_id }}"
            },
            {
              "fieldId": "action",
              "fieldValue": "approval_sent"
            },
            {
              "fieldId": "actor_email",
              "fieldValue": "system@workflow"
            },
            {
              "fieldId": "details",
              "fieldValue": "=Level {{ $('get_next_level').item.json.level_number }}  requests sent to role_id {{ $('generate_uuid').item.json.role_id}} "
            }
          ]
        }
      },
      "credentials": {
        "supabaseApi": {
          "id": "UMM6kngXouHxEYn4",
          "name": "Supabase account"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "48036695-12b4-479a-a547-eb45eb9da598",
      "name": "Responder a Webhook1",
      "type": "n8n-nodes-base.respondToWebhook",
      "position": [
        1552,
        2016
      ],
      "parameters": {
        "options": {},
        "respondWith": "text",
        "responseBody": "=Workflow Competed - {{ $json.Response }}"
      },
      "typeVersion": 1.4
    },
    {
      "id": "d2c8dca0-c040-4035-bbd2-5812e571e0b9",
      "name": "subir_a_almacenamiento_supabase",
      "type": "n8n-nodes-base.httpRequest",
      "position": [
        464,
        0
      ],
      "parameters": {
        "url": "=https://<your_project_id>.supabase.co/storage/v1/object/test-n8n/{{ $binary.data.fileName }}",
        "method": "POST",
        "options": {},
        "sendBody": true,
        "contentType": "binaryData",
        "authentication": "predefinedCredentialType",
        "inputDataFieldName": "data",
        "nodeCredentialType": "supabaseApi"
      },
      "credentials": {
        "supabaseApi": {
          "id": "UMM6kngXouHxEYn4",
          "name": "Supabase account"
        }
      },
      "typeVersion": 4.2
    },
    {
      "id": "86e2bbb7-44b6-43f7-bf31-28453caf3369",
      "name": "obtener_archivo_para_revisión",
      "type": "n8n-nodes-base.httpRequest",
      "position": [
        432,
        464
      ],
      "parameters": {
        "url": "=https://uptttiuxuaacxrdofqgm.supabase.co/storage/v1/object/{{ $('upload_to_supabase_storage').item.json.Key }}",
        "options": {},
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "supabaseApi"
      },
      "credentials": {
        "supabaseApi": {
          "id": "UMM6kngXouHxEYn4",
          "name": "Supabase account"
        }
      },
      "typeVersion": 4.2
    },
    {
      "id": "c82dba30-479d-4045-af9d-635f1aea605b",
      "name": "obtener_detalles_documento",
      "type": "n8n-nodes-base.supabase",
      "position": [
        1168,
        1456
      ],
      "parameters": {
        "filters": {
          "conditions": [
            {
              "keyName": "id",
              "keyValue": "={{ $json.document_id }}"
            }
          ]
        },
        "tableId": "documents",
        "operation": "get"
      },
      "credentials": {
        "supabaseApi": {
          "id": "UMM6kngXouHxEYn4",
          "name": "Supabase account"
        }
      },
      "typeVersion": 1
    },
    {
      "id": "13d7e82a-f7b3-4cbd-b51f-bcc1e57a1602",
      "name": "obtener_archivo_para_revisión1",
      "type": "n8n-nodes-base.httpRequest",
      "position": [
        1536,
        1456
      ],
      "parameters": {
        "url": "=https://<your_project_id>.supabase.co/storage/v1/object/test-n8n/{{ $json.content }}",
        "options": {},
        "authentication": "predefinedCredentialType",
        "nodeCredentialType": "supabaseApi"
      },
      "credentials": {
        "supabaseApi": {
          "id": "UMM6kngXouHxEYn4",
          "name": "Supabase account"
        }
      },
      "typeVersion": 4.2
    },
    {
      "id": "db503b96-a362-4b14-a41b-aa87bf156392",
      "name": "Si",
      "type": "n8n-nodes-base.if",
      "position": [
        80,
        1104
      ],
      "parameters": {
        "options": {},
        "conditions": {
          "options": {
            "version": 2,
            "leftValue": "",
            "caseSensitive": true,
            "typeValidation": "strict"
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          "combinator": "and",
          "conditions": [
            {
              "id": "eff8437b-ef76-4bef-a6c2-9d65083ab8c5",
              "operator": {
                "type": "object",
                "operation": "empty",
                "singleValue": true
              },
              "leftValue": "={{ $json }}",
              "rightValue": ""
            }
          ]
        }
      },
      "typeVersion": 2.2
    },
    {
      "id": "694b4cde-a457-4496-816f-02ba86b4eb9e",
      "name": "mensaje_respuesta",
      "type": "n8n-nodes-base.set",
      "position": [
        800,
        1296
      ],
      "parameters": {
        "options": {},
        "assignments": {
          "assignments": [
            {
              "id": "d6c443be-ca83-4708-b80b-9a5eefd11d60",
              "name": "Response",
              "type": "string",
              "value": "Not a value token"
            }
          ]
        }
      },
      "typeVersion": 3.4
    },
    {
      "id": "30cd5073-3d59-48ae-a572-57157ee5e6cb",
      "name": "mensaje_respuesta1",
      "type": "n8n-nodes-base.set",
      "position": [
        800,
        1792
      ],
      "parameters": {
        "options": {},
        "assignments": {
          "assignments": [
            {
              "id": "d6c443be-ca83-4708-b80b-9a5eefd11d60",
              "name": "Response",
              "type": "string",
              "value": "Rejected"
            }
          ]
        }
      },
      "typeVersion": 3.4
    },
    {
      "id": "17e8d16b-8c04-45de-90a0-1d8fc1711cd5",
      "name": "mensaje_respuesta2",
      "type": "n8n-nodes-base.set",
      "position": [
        128,
        2032
      ],
      "parameters": {
        "options": {},
        "assignments": {
          "assignments": [
            {
              "id": "d6c443be-ca83-4708-b80b-9a5eefd11d60",
              "name": "Response",
              "type": "string",
              "value": "Approved"
            }
          ]
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      },
      "typeVersion": 3.4
    },
    {
      "id": "bb9fb0aa-d3a2-434b-a34a-047562654983",
      "name": "Nota adhesiva2",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
        352,
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      ],
      "parameters": {
        "width": 336,
        "height": 288,
        "content": "### Update url for supabase storage "
      },
      "typeVersion": 1
    },
    {
      "id": "d902be56-14a6-4071-ae13-7b0dddf4284a",
      "name": "finalizar_formulario",
      "type": "n8n-nodes-base.form",
      "position": [
        1472,
        464
      ],
      "webhookId": "3af20380-25dd-4a07-970c-29929c8037e5",
      "parameters": {
        "options": {},
        "operation": "completion",
        "completionTitle": "Approval Workflow Started."
      },
      "typeVersion": 1
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      "id": "edf83e23-536a-4a9d-a5be-f6401690ab2a",
      "name": "Nota adhesiva3",
      "type": "n8n-nodes-base.stickyNote",
      "position": [
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      "parameters": {
        "color": 4,
        "width": 1664,
        "height": 1120,
        "content": "## Form Submit flow"
      },
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    },
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      "name": "Nota adhesiva4",
      "type": "n8n-nodes-base.stickyNote",
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      "parameters": {
        "color": 4,
        "width": 2448,
        "height": 1264,
        "content": "## Next Level Approval"
      },
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  ],
  "active": false,
  "pinData": {},
  "settings": {
    "executionOrder": "v1"
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  "versionId": "de5c52a4-7369-4d59-a8c1-b7e4e1aa5636",
  "connections": {
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