n8n_stack/imports/workflows/ollama-chatbot.json

{
  "id": "1001",
  "name": "Lokaler KI-Chatbot (Ollama)",
  "nodes": [
    {
      "parameters": {
        "httpMethod": "POST",
        "path": "chat",
        "responseMode": "responseNode",
        "options": {}
      },
      "id": "node-wh-001",
      "name": "Webhook",
      "type": "n8n-nodes-base.webhook",
      "typeVersion": 2,
      "position": [100, 300],
      "webhookId": "ollama-chat-webhook"
    },
    {
      "parameters": {
        "jsCode": "const body = $input.first().json.body;\nif (!body?.message) throw new Error('Kein \"message\"-Feld im Request-Body');\nreturn [{ json: {\n  session_id: body.session_id || Math.random().toString(36).slice(2, 18),\n  message: body.message,\n  model: body.model || 'qwen3:8b'\n}}];"
      },
      "id": "node-cd-001",
      "name": "Prepare",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [300, 300]
    },
    {
      "parameters": {
        "operation": "executeQuery",
        "query": "=WITH ensure AS (INSERT INTO chat_sessions (session_id, messages) VALUES ('{{ $json.session_id }}', '[]') ON CONFLICT (session_id) DO NOTHING) SELECT COALESCE(messages, '[]'::jsonb) AS messages FROM chat_sessions WHERE session_id = '{{ $json.session_id }}'",
        "additionalFields": {}
      },
      "id": "node-pg-001",
      "name": "Load History",
      "type": "n8n-nodes-base.postgres",
      "typeVersion": 2.5,
      "position": [500, 300],
      "credentials": {
        "postgres": {
          "id": "pnmeNZ3ONDWrQP8M",
          "name": "Postgres account"
        }
      }
    },
    {
      "parameters": {
        "jsCode": "const prep = $('Prepare').first().json;\nconst row = $input.first()?.json;\nconst history = Array.isArray(row?.messages) ? row.messages : [];\nconst messages = [...history, { role: 'user', content: prep.message }];\nreturn [{ json: { session_id: prep.session_id, model: prep.model, messages } }];"
      },
      "id": "node-cd-002",
      "name": "Build Messages",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [700, 300]
    },
    {
      "parameters": {
        "method": "POST",
        "url": "http://host.docker.internal:11434/api/chat",
        "sendBody": true,
        "contentType": "json",
        "specifyBody": "json",
        "jsonBody": "={{ JSON.stringify({ model: $json.model, messages: $json.messages, stream: false }) }}",
        "options": { "timeout": 120000 }
      },
      "id": "node-hr-001",
      "name": "Ollama Chat",
      "type": "n8n-nodes-base.httpRequest",
      "typeVersion": 4.2,
      "position": [900, 300]
    },
    {
      "parameters": {
        "jsCode": "const build = $('Build Messages').first().json;\nconst resp = $input.first().json;\nconst answer = resp.message.content;\nconst updatedMessages = [...build.messages, { role: 'assistant', content: answer }];\nconst m = JSON.stringify(updatedMessages).replace(/'/g, \"''\");\nconst upsert_query = `INSERT INTO chat_sessions (session_id, messages, updated_at) VALUES ('${build.session_id}', '${m}'::jsonb, NOW()) ON CONFLICT (session_id) DO UPDATE SET messages = '${m}'::jsonb, updated_at = NOW()`;\nreturn [{ json: { session_id: build.session_id, answer, model: resp.model, upsert_query } }];"
      },
      "id": "node-cd-003",
      "name": "Append Response",
      "type": "n8n-nodes-base.code",
      "typeVersion": 2,
      "position": [1100, 300]
    },
    {
      "parameters": {
        "operation": "executeQuery",
        "query": "={{ $json.upsert_query }}",
        "additionalFields": {}
      },
      "id": "node-pg-002",
      "name": "Save History",
      "type": "n8n-nodes-base.postgres",
      "typeVersion": 2.5,
      "position": [1300, 300],
      "credentials": {
        "postgres": {
          "id": "pnmeNZ3ONDWrQP8M",
          "name": "Postgres account"
        }
      }
    },
    {
      "parameters": {
        "respondWith": "json",
        "responseBody": "={{ JSON.stringify({ session_id: $('Append Response').first().json.session_id, answer: $('Append Response').first().json.answer, model: $('Append Response').first().json.model }) }}",
        "options": {}
      },
      "id": "node-rw-001",
      "name": "Respond",
      "type": "n8n-nodes-base.respondToWebhook",
      "typeVersion": 1.1,
      "position": [1500, 300]
    }
  ],
  "connections": {
    "Webhook":         { "main": [[{ "node": "Prepare",         "type": "main", "index": 0 }]] },
    "Prepare":         { "main": [[{ "node": "Load History",    "type": "main", "index": 0 }]] },
    "Load History":    { "main": [[{ "node": "Build Messages",  "type": "main", "index": 0 }]] },
    "Build Messages":  { "main": [[{ "node": "Ollama Chat",     "type": "main", "index": 0 }]] },
    "Ollama Chat":     { "main": [[{ "node": "Append Response", "type": "main", "index": 0 }]] },
    "Append Response": { "main": [[{ "node": "Save History",    "type": "main", "index": 0 }]] },
    "Save History":    { "main": [[{ "node": "Respond",         "type": "main", "index": 0 }]] }
  },
  "active": false,
  "settings": { "executionOrder": "v1" },
  "tags": []
}