주식 이상 감지 및 관련 뉴스 자동 알림 워크플로우

• •Slack Bot Token 또는 Webhook URL

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        "jsCode": "// === パラメータ設定 ===\nconst N = 20;   // 移動平均の期間\nconst k = 2;    // σの倍率（±2σ）\n\n// === データ取得 ===\nlet data = [];\n\n// Marketstackの出力構造をチェック\nif (items[0].json.data) {\n  // 通常ケース（Marketstackノードからそのまま）\n  data = items[0].json.data;\n} else {\n  // 予備パターン：items配列にデータが直接並んでいるケース\n  data = items.map(item => item.json);\n}\n\n// N件だけ抽出\ndata = data.slice(0, N);\n\n// === 終値のみ抽出 ===\nconst closes = data.map(d => d.close).filter(v => typeof v === 'number');\n\n// データがない場合の対策\nif (closes.length === 0) {\n  return [{ json: { error: \"No valid close data found.\" } }];\n}\n\n// === 移動平均と標準偏差を計算 ===\nconst mean = closes.reduce((a, b) => a + b, 0) / closes.length;\nconst variance = closes.reduce((a, b) => a + Math.pow(b - mean, 2), 0) / closes.length;\nconst sigma = Math.sqrt(variance);\n\n// === 最新値（先頭） ===\nconst latestClose = closes[0] + 100;\n\n// === 判定 ===\nlet status = \"normal\";\nif (latestClose > mean + k * sigma) {\n  status = \"high (above +2σ)\";\n} else if (latestClose < mean - k * sigma) {\n  status = \"low (below -2σ)\";\n}\n\n// === 出力 ===\nreturn [\n  {\n    json: {\n      mean: mean.toFixed(2),\n      sigma: sigma.toFixed(2),\n      upper: (mean + k * sigma).toFixed(2),\n      lower: (mean - k * sigma).toFixed(2),\n      latest: latestClose.toFixed(2),\n      status,\n      count: closes.length\n    }\n  }\n];\n"
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        "text": "=✅ 異常なし この銘柄の終値は安定しています。 現在値：{{ $('Calculate Deviation').item.json.latest }}（平均 {{ $('Calculate Deviation').item.json.mean }} ± {{ $('Calculate Deviation').item.json.sigma }})",
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        "content": "## Daily Check (09:00 JST)\n\nStarts the workflow every morning at 09:00 JST. Adjust schedule/timezone as needed."
      },
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        "content": "## Get Stock Data (Marketstack)\nRetrieves the latest EOD prices for the configured ticker. Edit symbol and date range. Keep the limit ≥ 20 for a stable mean/σ."
      },
      "typeVersion": 1
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    {
      "id": "e85baa53-b0ed-4017-98b0-e7a07a88c7aa",
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        "content": "## Customization Tips\n\n- Monitor multiple tickers: duplicate **Get Stock Data** and merge results.\n- Replace Hacker News with **NewsAPI** / **Google News RSS** for broader coverage.\n- Switch Slack to **Telegram / Discord / Teams / LINE Messaging API**.\n- Add a **Set (Fields)** node to centralize user-configurable variables:\n  - `symbol` (ticker), `days` (N), `sigmaK` (k), `newsQuery`, `slackChannel`\n- Add an **IF** to translate only when language != JA (cost optimization).\n\n\n"
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        "content": "## Node Structure Overview\n\nFlow:\n🕘 Daily Check (09:00) \n → 📊 Get Stock Data (Marketstack)\n → 🧮 Calculate Deviation (±2σ)\n → 🔀 IF: Is Anomaly? (status != \"normal\")\n\nTrue (Anomaly):\n  → 📰 Get Related News (Hacker News)\n  → ✍️ Format News (Title + Summary + URL)\n  → 🌐 Translate News (EN → JA, DeepL)\n  → 🔗 Merge Original + Translated\n  → 💬 Send Alert to Slack\n\nFalse (Normal):\n  → 💬 Send Normal Report to Slack\n"
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      "id": "fa231074-0537-4cc6-b33c-e90006605377",
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      "position": [
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        "content": "## Send Normal Report to Slack\n\nSends a concise “no anomaly” message with basic stats.\n"
      },
      "typeVersion": 1
    },
    {
      "id": "2c8bbc35-0320-4350-b64f-e58eacd7c974",
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      "position": [
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      "parameters": {
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        "content": "## 🛠️ Setup Instructions\n\n1. Connect your **Marketstack**, **DeepL**, and **Slack** credentials.\n2. Update ticker symbol inside “Get Stock Data”.\n3. Customize Slack channel in both Slack nodes.\n4. Modify time or schedule in “Daily Check” as needed.\n"
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      "id": "7fbb2805-1ffd-4ce6-86a6-04d9ba827191",
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      "parameters": {
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        "content": "## Price Anomaly Detection & News Alert (Marketstack + HN + DeepL + Slack)\n\n## Overview\nThis workflow monitors a stock’s closing price via **Marketstack**. It computes a **20-day moving average** and **standard deviation (±2σ)**. If the latest close is outside ±2σ, it flags an **anomaly**, fetches **related headlines from Hacker News**, **translates** them to Japanese with **DeepL**, and **posts both original and translated text to Slack**. When no anomaly is detected, it sends a concise “normal” report.\n\n## How it works\n1) Daily trigger at 09:00 JST  \n2) Marketstack: fetch EOD data  \n3) Code: compute mean/σ and classify (normal/high/low)  \n4) IF: anomaly? → yes = news path / no = normal report  \n5) Hacker News: search related items  \n6) DeepL: translate EN → JA  \n7) Slack: send bilingual notification\n\n## Requirements\n- Marketstack API key\n- DeepL API key\n- Slack OAuth2 (bot token / channel permission)\n\n## Notes\n- Edit the ticker in **Get Stock Data**.\n- Adjust **N** (days) and **k** (sigma multiplier) in **Calculate Deviation**.\n- Keep credentials out of HTTP nodes (use n8n Credentials).\n"
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        "content": "## Calculate Deviation\n\nComputes 20-day mean and standard deviation; classifies the latest close as normal, high (+2σ), or low (−2σ)."
      },
      "typeVersion": 1
    },
    {
      "id": "d3e597a0-0400-400d-970d-f179bf3c574c",
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      "position": [
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        "content": "## Is Anomaly? (status != \"normal\")\n\nBranches to the news path only when the latest close exceeds ±2σ."
      },
      "typeVersion": 1
    },
    {
      "id": "cb2c48c9-349d-4c3e-9f17-ed4636ca0b82",
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        "content": "## Get Related News (Hacker News)\n\nSearches articles by the ticker/company keyword. You can switch to NewsAPI/Google RSS."
      },
      "typeVersion": 1
    },
    {
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      "position": [
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        "content": "## Format News (Title + Summary + URL)\n\nCleans HTML (e.g., <em>) and formats top items for translation/Slack."
      },
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    },
    {
      "id": "1ef7949a-e396-449a-b21c-4e72e7031c38",
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      "parameters": {
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        "content": "## Translate News (EN → JA)\n\nDeepL translation to Japanese. Change target_lang if needed."
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        "content": "## Merge Original + Translated\n\nAppends original English and translated Japanese into one message payload."
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      "typeVersion": 1
    },
    {
      "id": "0d5d6b48-6983-4136-80e3-0cf9de926972",
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        "content": "## Send Alert to Slack (Anomaly)\n\nSends bilingual alert with stats (latest, mean, σ) and related news."
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        "jsCode": "// === Hacker News 出力からタイトル・本文・URLを整形 ===\nconst results = items.map(item => {\n  const highlight = item.json._highlightResult || {};\n\n  const title =\n    highlight.title?.value ||\n    item.json.title ||\n    \"No Title\";\n\n  const story =\n    highlight.story_text?.value ||\n    item.json.story_text ||\n    \"No summary available.\";\n\n  const url =\n    item.json.url ||\n    highlight.url?.value ||\n    \"No URL\";\n\n  // === HTMLタグ（<em>など）を除去 ===\n  const cleanTitle = title.replace(/<[^>]*>/g, \"\");\n  const cleanStory = story.replace(/<[^>]*>/g, \"\");\n\n  return `📰 ${cleanTitle}\\n${cleanStory}\\n🔗 ${url}`;\n});\n\n// === 出力 ===\nreturn [\n  {\n    json: {\n      message: results.slice(0, 3).join(\"\\n\\n---\\n\\n\"), // 上位3件を区切って結合\n    },\n  },\n];\n"
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        "jsCode": "const map = {\n  AMZN: 'Amazon',\n  AAPL: 'Apple',\n  GOOG: 'Google',\n  MSFT: 'Microsoft',\n  TSLA: 'Tesla',\n};\n\n// 入力の中身を確認\nconsole.log('INPUT items:', items);\n\nconst first = (items && items[0] && items[0].json) ? items[0].json : {};\nconst symbol = String(first.symbol || first.ticker || '').toUpperCase();\n\nif (!symbol) {\n  // symbolが無い時は理由と入力を返して可視化\n  return [\n    {\n      json: {\n        error: 'symbol is missing',\n        debugInput: first,\n      },\n    },\n  ];\n}\n\nconst keyword = map[symbol] || symbol;\n\nreturn [\n  {\n    json: { keyword, symbol },\n  },\n];\n"
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