API, 데이터베이스 및 Slack을 통해 원자재 가격 추세를 추적하고 지능적인 구매 조언을 받기

• •PostgreSQL 데이터베이스 연결 정보
• •대상 API의 인증 정보가 필요할 수 있음

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  "name": "Track Ingredient Price Trends & Get Smart Buying Suggestions via API, Database & Slack",
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        "query": "WITH price_trends AS (\n  SELECT \n    ingredient,\n    price,\n    timestamp,\n    LAG(price) OVER (PARTITION BY ingredient ORDER BY timestamp) as prev_price,\n    LAG(timestamp) OVER (PARTITION BY ingredient ORDER BY timestamp) as prev_timestamp\n  FROM price_history\n  WHERE timestamp >= NOW() - INTERVAL '30 days'\n)\nSELECT \n  ingredient,\n  price as current_price,\n  prev_price,\n  CASE \n    WHEN prev_price IS NULL THEN 0\n    ELSE ((price - prev_price) / prev_price) * 100\n  END as price_change_percent,\n  timestamp,\n  CASE \n    WHEN price < prev_price THEN 'DECREASING'\n    WHEN price > prev_price THEN 'INCREASING'\n    ELSE 'STABLE'\n  END as trend\nFROM price_trends\nWHERE prev_price IS NOT NULL\nORDER BY ingredient, timestamp DESC;",
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    {
      "id": "656ed3fc-386b-4fb1-b34e-a558ad8a3edf",
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      "position": [
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      "parameters": {
        "jsCode": "// Create HTML dashboard\nconst items = $input.all();\nconst data = items.map(item => item.json);\n\nconst html = `\n<!DOCTYPE html>\n<html>\n<head>\n    <title>Price Fluctuation Dashboard</title>\n    <style>\n        body { font-family: Arial, sans-serif; margin: 20px; background-color: #f5f5f5; }\n        .container { max-width: 1200px; margin: 0 auto; }\n        .header { background: #2c3e50; color: white; padding: 20px; border-radius: 8px; margin-bottom: 20px; }\n        .card { background: white; padding: 20px; margin: 10px 0; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); }\n        .high-urgency { border-left: 5px solid #e74c3c; }\n        .medium-urgency { border-left: 5px solid #f39c12; }\n        .low-urgency { border-left: 5px solid #27ae60; }\n        .price-info { display: flex; justify-content: space-between; align-items: center; }\n        .price-change { font-weight: bold; }\n        .positive { color: #e74c3c; }\n        .negative { color: #27ae60; }\n        .recommendation { font-size: 1.1em; font-weight: bold; }\n        .buy-now { color: #27ae60; }\n        .consider-buying { color: #f39c12; }\n        .wait, .avoid-buying { color: #e74c3c; }\n        .monitor { color: #3498db; }\n        .summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 20px; margin-bottom: 20px; }\n        .stat-card { background: #3498db; color: white; text-align: center; padding: 20px; border-radius: 8px; }\n    </style>\n</head>\n<body>\n    <div class=\"container\">\n        <div class=\"header\">\n            <h1>🍽️ Price Fluctuation Dashboard</h1>\n            <p>Food Industry Ingredient Price Monitoring & Buying Recommendations</p>\n            <p>Last Updated: ${new Date().toLocaleString()}</p>\n        </div>\n        \n        <div class=\"summary\">\n            <div class=\"stat-card\">\n                <h3>${data.filter(d => d.urgency === 'HIGH').length}</h3>\n                <p>High Priority Items</p>\n            </div>\n            <div class=\"stat-card\">\n                <h3>${data.filter(d => d.recommendation === 'BUY NOW').length}</h3>\n                <p>Buy Now Opportunities</p>\n            </div>\n            <div class=\"stat-card\">\n                <h3>${data.filter(d => d.trend === 'DECREASING').length}</h3>\n                <p>Decreasing Prices</p>\n            </div>\n            <div class=\"stat-card\">\n                <h3>${data.filter(d => d.trend === 'INCREASING').length}</h3>\n                <p>Increasing Prices</p>\n            </div>\n        </div>\n        \n        <div class=\"recommendations\">\n            ${data.map(item => `\n                <div class=\"card ${item.urgency.toLowerCase()}-urgency\">\n                    <div class=\"price-info\">\n                        <div>\n                            <h3>${item.ingredient}</h3>\n                            <p class=\"recommendation ${item.recommendation.toLowerCase().replace(/\\s+/g, '-')}\">\n                                ${item.recommendation}\n                            </p>\n                        </div>\n                        <div>\n                            <div>Current Price: $${item.current_price}</div>\n                            <div class=\"price-change ${item.price_change_percent < 0 ? 'negative' : 'positive'}\">\n                                ${item.price_change_percent > 0 ? '+' : ''}${item.price_change_percent.toFixed(1)}%\n                            </div>\n                            <div>Trend: ${item.trend}</div>\n                        </div>\n                    </div>\n                    <div style=\"margin-top: 10px; padding: 10px; background: #f8f9fa; border-radius: 4px;\">\n                        <strong>Reason:</strong> ${item.reason}\n                    </div>\n                    <div style=\"margin-top: 5px; font-size: 0.9em; color: #666;\">\n                        <strong>Urgency:</strong> ${item.urgency}\n                    </div>\n                </div>\n            `).join('')}\n        </div>\n    </div>\n</body>\n</html>\n`;\n\nreturn [{ json: { html: html } }];"
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      "position": [
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      "webhookId": "1bb53760-d90c-4bea-b80f-56f0a767eefb",
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          "attachments": "data:text/html;base64,{{ $json.html | base64 }}"
        },
        "subject": "Daily Price Fluctuation Report - {{ $now.format('YYYY-MM-DD') }}",
        "toEmail": "abc@gmail.com",
        "fromEmail": "xyz@gmail.com"
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        "url": "https://hooks.slack.com/services/YOUR/SLACK/WEBHOOK",
        "options": {},
        "sendBody": true,
        "bodyParameters": {
          "parameters": [
            {
              "name": "text",
              "value": "🍽️ Daily Price Update: {{ $('Get Dashboard Data').all().filter(item => item.json.urgency === 'HIGH').length }} high priority items need attention!"
            },
            {
              "name": "attachments",
              "value": "={{ $('Get Dashboard Data').all().filter(item => item.json.urgency === 'HIGH').map(item => ({ color: item.json.recommendation === 'BUY NOW' ? 'good' : 'danger', fields: [{ title: item.json.ingredient, value: `${item.json.recommendation} - ${item.json.reason}`, short: false }] })) }}"
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      "parameters": {
        "query": "CREATE TABLE IF NOT EXISTS price_history (\n  id SERIAL PRIMARY KEY,\n  ingredient VARCHAR(100) NOT NULL,\n  price DECIMAL(10,2) NOT NULL,\n  unit VARCHAR(50) NOT NULL,\n  supplier VARCHAR(100),\n  timestamp TIMESTAMP NOT NULL,\n  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);\n\nCREATE TABLE IF NOT EXISTS buying_recommendations (\n  id SERIAL PRIMARY KEY,\n  ingredient VARCHAR(100) NOT NULL,\n  current_price DECIMAL(10,2) NOT NULL,\n  price_change_percent DECIMAL(5,2),\n  trend VARCHAR(20),\n  recommendation VARCHAR(50),\n  urgency VARCHAR(20),\n  reason TEXT,\n  generated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);\n\nCREATE INDEX IF NOT EXISTS idx_price_history_ingredient_timestamp ON price_history(ingredient, timestamp);\nCREATE INDEX IF NOT EXISTS idx_recommendations_generated_at ON buying_recommendations(generated_at);",
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    {
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      "type": "n8n-nodes-base.stickyNote",
      "position": [
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      "parameters": {
        "width": 1000,
        "height": 520,
        "content": "## 📌 Workflow Overview: Price Fluctuation Dashboard\n\n- Daily Price Check – Triggers the workflow daily to monitor price changes.\n\n- Fetch API Prices – Retrieves the latest prices from an external API.\n\n- Setup Database – Ensures database tables are ready before inserting data.\n\n- Store Price Data – Saves current prices to the database for tracking.\n\n- Calculate Trends – Analyzes historical prices to detect patterns.\n\n- Generate Recommendations – Suggests actions based on price trends (e.g., buy/sell).\n\n- Store Recommendations – Saves recommendations for future reporting.\n\n- Get Dashboard Data – Gathers the necessary data for dashboard generation.\n\n- Generate Dashboard HTML – Builds an HTML dashboard to visualize insights.\n\n- Send Email Report – Emails the dashboard report to users.\n\n- Send Slack Alert – Sends key alerts or recommendations to Slack channels."
      },
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    }
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