commit af754182fa45f18e6d3c97608e20716a6d7ea183
Author: prinz-pilaw <r.prasanna94@yahoo.de>
Date:   Sat Aug 1 00:37:02 2026 +0000

    Initialer Versionstand des eBay Trackers

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9a41f8c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+# Passwörter und API-Keys ignorieren
+.env
+
+# Dependencies / Pakete ignorieren
+node_modules/
+
+# Logs ignorieren
+*.log
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..6c2cfd6
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,14 @@
+FROM node:20-alpine
+
+WORKDIR /app
+
+# Dependencies installieren
+COPY package*.json ./
+RUN npm ci --only=production
+
+# Sourcecode kopieren
+COPY . .
+
+EXPOSE 3001
+
+CMD ["npm", "start"]
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..3d8b9b5
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,11 @@
+version: '3.8'
+
+services:
+  ebay-tracker:
+    build: .
+    container_name: ebay-tracker
+    restart: unless-stopped
+    ports:
+      - "3001:3001"
+    env_file:
+      - .env
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..ff0547b
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1174 @@
+{
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+  "version": "1.1.0",
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..327cfec
--- /dev/null
+++ b/package.json
@@ -0,0 +1,15 @@
+{
+  "name": "ebay-tracker",
+  "version": "1.1.0",
+  "type": "module",
+  "main": "src/server.js",
+  "scripts": {
+    "start": "node src/server.js"
+  },
+  "dependencies": {
+    "axios": "^1.7.2",
+    "dotenv": "^16.4.5",
+    "express": "^4.19.2",
+    "pg": "^8.12.0"
+  }
+}
diff --git a/src/db.js b/src/db.js
new file mode 100644
index 0000000..b892c0f
--- /dev/null
+++ b/src/db.js
@@ -0,0 +1,84 @@
+import pg from 'pg';
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+const { Pool } = pg;
+
+export const pool = new Pool({
+  host: process.env.PGHOST,
+  port: parseInt(process.env.PGPORT || '5432'),
+  database: process.env.PGDATABASE,
+  user: process.env.PGUSER,
+  password: process.env.PGPASSWORD,
+  connectionTimeoutMillis: 5000,
+});
+
+// UTF-8 erzwingen
+pool.on('connect', (client) => {
+  client.query("SET client_encoding TO 'UTF8'");
+});
+
+export async function initDb() {
+  const client = await pool.connect();
+  try {
+    console.log('🔄 Prüfe und erstelle Datenbank-Tabellen...');
+
+    // 1. Tabelle für Verkäufer-Whitelist
+    await client.query(`
+      CREATE TABLE IF NOT EXISTS sellers (
+        id SERIAL PRIMARY KEY,
+        username VARCHAR(255) UNIQUE NOT NULL,
+        created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+      );
+    `);
+
+    // 2. Tabelle für Telegram-Suchaufträge
+    await client.query(`
+      CREATE TABLE IF NOT EXISTS tracked_searches (
+        id SERIAL PRIMARY KEY,
+        chat_id VARCHAR(255) NOT NULL,
+        query TEXT NOT NULL,
+        negative_keywords TEXT[] DEFAULT '{}',
+        is_active BOOLEAN DEFAULT TRUE,
+        created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+      );
+    `);
+
+    // 3. Tabelle für Artikel-Snapshots (Preisverlauf & Alerts)
+    await client.query(`
+      CREATE TABLE IF NOT EXISTS item_snapshots (
+        id SERIAL PRIMARY KEY,
+        item_id VARCHAR(255) UNIQUE NOT NULL,
+        search_id INTEGER REFERENCES tracked_searches(id) ON DELETE CASCADE,
+        seller_username VARCHAR(255),
+        title TEXT NOT NULL,
+        price NUMERIC(10, 2) NOT NULL,
+        currency VARCHAR(10) DEFAULT 'EUR',
+        item_url TEXT,
+        image_url TEXT,
+        created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+        last_updated TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+      );
+    `);
+
+   // In initDb() ergänzen:
+await client.query(`
+  ALTER TABLE item_snapshots ADD COLUMN IF NOT EXISTS lowest_price NUMERIC(10, 2);
+
+  CREATE TABLE IF NOT EXISTS price_history (
+    id SERIAL PRIMARY KEY,
+    item_id VARCHAR(255) NOT NULL,
+    price NUMERIC(10, 2) NOT NULL,
+    recorded_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+  );
+`);
+
+    console.log('✅ PostgreSQL Tabellen erfolgreich initialisiert (UTF-8).');
+  } catch (error) {
+    console.error('❌ Fehler bei der Tabellen-Initialisierung:', error.message);
+    throw error;
+  } finally {
+    client.release();
+  }
+}
diff --git a/src/ebayAuth.js b/src/ebayAuth.js
new file mode 100644
index 0000000..b5b00e3
--- /dev/null
+++ b/src/ebayAuth.js
@@ -0,0 +1,45 @@
+import axios from 'axios';
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+let tokenCache = {
+  token: null,
+  expiresAt: 0
+};
+
+export async function getEbayToken() {
+  const now = Date.now();
+
+  if (tokenCache.token && now < tokenCache.expiresAt - 5 * 60 * 1000) {
+    return tokenCache.token;
+  }
+
+  console.log('🔄 Hole neuen eBay OAuth Access Token...');
+
+  const credentials = Buffer.from(
+    `${process.env.EBAY_APP_ID}:${process.env.EBAY_CERT_ID}`
+  ).toString('base64');
+
+  try {
+    const response = await axios.post(
+      'https://api.ebay.com/identity/v1/oauth2/token',
+      'grant_type=client_credentials&scope=https://api.ebay.com/oauth/api_scope',
+      {
+        headers: {
+          'Content-Type': 'application/x-www-form-urlencoded',
+          'Authorization': `Basic ${credentials}`
+        }
+      }
+    );
+
+    tokenCache.token = response.data.access_token;
+    tokenCache.expiresAt = now + (response.data.expires_in * 1000);
+
+    console.log('✅ eBay Token erfolgreich erneuert!');
+    return tokenCache.token;
+  } catch (error) {
+    console.error('❌ eBay Auth Fehler:', error.response?.data || error.message);
+    throw new Error('eBay Authentifizierung fehlgeschlagen.');
+  }
+}
diff --git a/src/ebayService.js b/src/ebayService.js
new file mode 100644
index 0000000..7142f1c
--- /dev/null
+++ b/src/ebayService.js
@@ -0,0 +1,86 @@
+import axios from 'axios';
+import { getEbayToken } from './ebayAuth.js';
+
+// Hilfsfunktion: Aufteilen eines Arrays in kleinere Häppchen (Chunks)
+function chunkArray(array, chunkSize) {
+  const chunks = [];
+  for (let i = 0; i < array.length; i += chunkSize) {
+    chunks.push(array.slice(i, i + chunkSize));
+  }
+  return chunks;
+}
+
+/**
+ * Durchsucht eBay nach ALLEN Whitelist-Verkäufern in der Datenbank
+ */
+export async function searchEbayProducts(query, allowedSellers = [], negativeKeywords = []) {
+  if (!allowedSellers || allowedSellers.length === 0) {
+    console.log('⚠️ Keine Verkäufer in der Whitelist hinterlegt.');
+    return [];
+  }
+
+  try {
+    const token = await getEbayToken();
+
+    // 1. Verkäufernamen bereinigen
+    const validSellers = allowedSellers
+      .map(s => String(s).trim())
+      .filter(Boolean);
+
+    if (validSellers.length === 0) return [];
+
+    // 2. Verkäufer in 25er-Pakete aufteilen
+    const sellerBatches = chunkArray(validSellers, 25);
+    let allRawItems = [];
+
+    // 3. Jedes 25er-Paket nacheinander bei eBay abfragen
+    for (const batch of sellerBatches) {
+      const formattedSellers = batch.map(s => encodeURIComponent(s)).join('|');
+      const sellerFilterString = `sellers:{${formattedSellers}}`;
+
+      const response = await axios.get('https://api.ebay.com/buy/browse/v1/item_summary/search', {
+        headers: {
+          'Authorization': `Bearer ${token}`,
+          'X-EBAY-C-MARKETPLACE-ID': 'EBAY-DE'
+        },
+        params: {
+          q: query,
+          filter: sellerFilterString,
+          limit: 50,
+          sort: 'newlyListed'
+        }
+      });
+
+      const items = response.data.itemSummaries || [];
+      allRawItems = allRawItems.concat(items);
+    }
+
+    // 4. Duplikate über die itemId entfernen
+    const uniqueItemsMap = new Map();
+    for (const item of allRawItems) {
+      uniqueItemsMap.set(item.itemId, item);
+    }
+    const uniqueItems = Array.from(uniqueItemsMap.values());
+
+    // 5. Negativ-Keywords lokal ausfiltern
+    const filteredItems = uniqueItems.filter(item => {
+      const titleLower = item.title.toLowerCase();
+      return !negativeKeywords.some(kw => titleLower.includes(kw.toLowerCase().trim()));
+    });
+
+    return filteredItems.map(item => ({
+      itemId: item.itemId,
+      title: item.title,
+      price: item.price?.value,
+      currency: item.price?.currency || 'EUR',
+      sellerUsername: item.seller?.username || 'Unbekannt',
+      itemUrl: item.itemWebUrl,
+      imageUrl: item.image?.imageUrl || null
+    }));
+
+  } catch (error) {
+    const apiError = error.response?.data?.errors?.[0]?.message || error.message;
+    console.error(`❌ Fehler bei der eBay-Suche für "${query}":`, apiError);
+    return [];
+  }
+}
diff --git a/src/ebayService_BK_1.js b/src/ebayService_BK_1.js
new file mode 100644
index 0000000..6f6a416
--- /dev/null
+++ b/src/ebayService_BK_1.js
@@ -0,0 +1,47 @@
+import axios from 'axios';
+import { getEbayToken } from './ebayAuth.js';
+
+export async function searchEbayProducts(query, negativeKeywords = [], sellersWhitelist = []) {
+  const token = await getEbayToken();
+
+  let filterParam = '';
+  if (sellersWhitelist.length > 0) {
+    filterParam = `sellers:{${sellersWhitelist.join('|')}}`;
+  }
+
+  try {
+    const response = await axios.get('https://api.ebay.com/buy/browse/v1/item_summary/search', {
+      headers: {
+        'Authorization': `Bearer ${token}`,
+        'X-EBAY-C-MARKETPLACE-ID': 'EBAY-DE'
+      },
+      params: {
+        q: query,
+        filter: filterParam || undefined,
+        limit: 50
+      }
+    });
+
+    const rawItems = response.data.itemSummaries || [];
+
+    const filteredItems = rawItems.filter(item => {
+      const titleLower = item.title.toLowerCase();
+      if (!negativeKeywords || negativeKeywords.length === 0) return true;
+      return !negativeKeywords.some(neg => titleLower.includes(neg.toLowerCase().trim()));
+    });
+
+    return filteredItems.map(item => ({
+      itemId: item.itemId,
+      title: item.title,
+      price: parseFloat(item.price?.value || 0),
+      currency: item.price?.currency || 'EUR',
+      sellerUsername: item.seller?.username || 'Unbekannt',
+      itemUrl: item.itemWebUrl,
+      imageUrl: item.image?.imageUrl || null
+    }));
+
+  } catch (error) {
+    console.error(`❌ eBay API Fehler für Query "${query}":`, error.response?.data || error.message);
+    return [];
+  }
+}
diff --git a/src/server.js b/src/server.js
new file mode 100644
index 0000000..6742721
--- /dev/null
+++ b/src/server.js
@@ -0,0 +1,169 @@
+import express from 'express';
+import dotenv from 'dotenv';
+import { initDb, pool } from './db.js';
+import { runTrackingCycle } from './tracker.js';
+import { searchEbayProducts } from './ebayService.js';
+
+dotenv.config();
+
+const app = express();
+app.use(express.json());
+
+const PORT = process.env.PORT || 3001;
+
+// Hilfsfunktion: Repariert doppelt-kodierte Umlaute (Mojibake)
+function fixEncoding(str) {
+  if (!str || typeof str !== 'string') return str;
+  // Wenn der String typische Mojibake-Zeichen (wie ü für ü) enthält
+  if (str.includes('Ã')) {
+    try {
+      return Buffer.from(str, 'latin1').toString('utf-8');
+    } catch (e) {
+      return str;
+    }
+  }
+  return str;
+}
+
+
+
+// Healthcheck
+app.get('/health', (req, res) => res.json({ status: 'ok', timestamp: new Date() }));
+
+// Endpunkt 1: Suchauftrag aus Telegram / n8n in Postgres speichern
+app.post('/searches/add', async (req, res) => {
+  const { chatId, query, negativeKeywords } = req.body;
+
+  if (!chatId || !query) {
+    return res.status(400).json({ error: 'chatId und query sind Pflichtfelder.' });
+  }
+
+  // 🛠️ FIX: Robustes Parsing für negativeKeywords
+  let parsedKeywords = [];
+
+  if (Array.isArray(negativeKeywords)) {
+    // Bereits ein echtes JS-Array
+    parsedKeywords = negativeKeywords;
+  } else if (typeof negativeKeywords === 'string') {
+    const trimmed = negativeKeywords.trim();
+    if (trimmed.startsWith('[')) {
+      // Wurde als JSON-String gesendet: ["a", "b"]
+      try {
+        parsedKeywords = JSON.parse(trimmed);
+      } catch (e) {
+        parsedKeywords = [];
+      }
+    } else if (trimmed.length > 0) {
+      // Wurde als Komma-getrennter String gesendet: "controller, headset"
+      parsedKeywords = trimmed.split(',').map(item => item.trim());
+    }
+  }
+
+  try {
+    const result = await pool.query(
+      `INSERT INTO tracked_searches (chat_id, query, negative_keywords) 
+       VALUES ($1, $2, $3) RETURNING id`,
+      [chatId, query, parsedKeywords] // 👈 Hier wird das saubere JS-Array übergeben
+    );
+
+    res.status(201).json({
+      success: true,
+      message: 'Suchauftrag erfolgreich gespeichert.',
+      searchId: result.rows[0].id
+    });
+  } catch (error) {
+    console.error('Fehler beim Speichern der Suche:', error.message);
+    res.status(500).json({ error: 'Datenbankfehler beim Speichern.' });
+  }
+});
+
+// Endpunkt: Statische Liste von Verkäufern hinzufügen (unterstützt Arrays, Komma- & Zeilenumbrüche)
+app.post('/sellers/add', async (req, res) => {
+  const { sellers, username } = req.body;
+
+  // Akzeptiert sowohl "sellers" (Liste) als auch "username" (Einzelwert)
+  const rawInput = sellers || username;
+
+  if (!rawInput) {
+    return res.status(400).json({ error: 'Bitte gib mindestens einen Verkäufer an.' });
+  }
+
+  let sellerList = [];
+
+  if (Array.isArray(rawInput)) {
+    // Falls n8n ein JSON-Array schickt: ["shop1", "shop2"]
+    sellerList = rawInput;
+  } else if (typeof rawInput === 'string') {
+    // Trennt bei Kommas ODER Zeilenumbrüchen (\n)
+    sellerList = rawInput.split(/[\n,]+/).map(s => s.trim()).filter(Boolean);
+  }
+
+  if (sellerList.length === 0) {
+    return res.status(400).json({ error: 'Keine gültigen Verkäufernamen gefunden.' });
+  }
+
+  try {
+    const newlyAdded = [];
+    for (const name of sellerList) {
+      	const cleanName = fixEncoding(name)
+	const result = await pool.query(
+        `INSERT INTO sellers (username) VALUES ($1) ON CONFLICT (username) DO NOTHING RETURNING username`,
+        [cleanName]
+      );
+      if (result.rows.length > 0) {
+        newlyAdded.push(name);
+      }
+    }
+
+    res.json({
+      success: true,
+      message: `${sellerList.length} Verkäufer verarbeitet (${newlyAdded.length} neu hinzugefügt).`,
+      totalProcessed: sellerList.length,
+      newlyAdded: newlyAdded
+    });
+
+  } catch (error) {
+    console.error('Fehler beim Speichern der Verkäufer:', error.message);
+    res.status(500).json({ error: 'Datenbankfehler.' });
+  }
+});
+
+
+// Endpunkt 3: Der /scrape Endpunkt für n8n (Schedule Trigger)
+app.post('/scrape', async (req, res) => {
+  const { webhookUrl } = req.body; // Optional: Kann in n8n dynamisch mitgegeben werden
+
+  // Sofort 202 Accepted melden, damit n8n nicht in HTTP-Timeouts rennt
+  res.status(202).json({
+    message: 'Scrape-Job akzeptiert und wird im Hintergrund ausgeführt.'
+  });
+
+  // Scraping asynchron ausführen
+  runTrackingCycle(webhookUrl).catch(err => {
+    console.error('Hintergrund-Fehler beim Scrapen:', err.message);
+  });
+});
+
+// Endpunkt für n8n (Schedule): Führt den Scraper aus & gibt Preisänderungen zurück
+app.post('/tracker/run', async (req, res) => {
+  try {
+    const changes = await runTrackingCycle();
+    res.json({
+      success: true,
+      count: changes.length,
+      priceChanges: changes
+    });
+  } catch (error) {
+    res.status(500).json({ error: error.message });
+  }
+});
+
+// Server-Start
+async function startServer() {
+  await initDb();
+  app.listen(PORT, '0.0.0.0', () => {
+    console.log(`🚀 eBay-Tracker Server läuft auf Port ${PORT} (Steuerung via n8n)`);
+  });
+}
+
+startServer();
diff --git a/src/tracker.js b/src/tracker.js
new file mode 100644
index 0000000..a5767e4
--- /dev/null
+++ b/src/tracker.js
@@ -0,0 +1,115 @@
+import { pool } from './db.js';
+import { searchEbayProducts } from './ebayService.js';
+
+export async function runTrackingCycle() {
+  console.log('🚀 Starte eBay-Tracking-Durchlauf mit Historien-Vergleich...');
+  const notifications = [];
+
+  try {
+    const sellersResult = await pool.query('SELECT username FROM sellers');
+    const allowedSellers = sellersResult.rows.map(row => row.username);
+
+    if (allowedSellers.length === 0) return notifications;
+
+    const searchesResult = await pool.query('SELECT * FROM tracked_searches WHERE is_active = TRUE');
+    const searches = searchesResult.rows;
+
+    for (const search of searches) {
+      const foundItems = await searchEbayProducts(
+        search.query,
+        allowedSellers,
+        search.negative_keywords || []
+      );
+
+      for (const item of foundItems) {
+        const newPrice = parseFloat(item.price);
+
+        // 1. Artikel in der DB suchen (Preis + bisherigen Tiefstpreis abfragen)
+        const existing = await pool.query(
+          'SELECT price, lowest_price FROM item_snapshots WHERE item_id = $1',
+          [item.itemId]
+        );
+
+        if (existing.rows.length === 0) {
+          // 🆕 BRANDNEUER ARTIKEL
+          notifications.push({
+            type: 'NEW',
+            title: item.title,
+            oldPrice: null,
+            newPrice: newPrice.toFixed(2),
+            lowestPrice: newPrice.toFixed(2),
+            isAllTimeLow: true,
+            diff: 'NEU',
+            seller: item.sellerUsername,
+            itemUrl: item.itemUrl
+          });
+
+          // In Preishistorie eintragen
+          await pool.query(
+            'INSERT INTO price_history (item_id, price) VALUES ($1, $2)',
+            [item.itemId, newPrice]
+          );
+
+        } else {
+          // 🏷️ BEREITS BEKANNTER ARTIKEL
+          const oldPrice = parseFloat(existing.rows[0].price);
+          const currentLowest = existing.rows[0].lowest_price 
+            ? parseFloat(existing.rows[0].lowest_price) 
+            : oldPrice;
+
+          if (oldPrice !== newPrice) {
+            const diffVal = newPrice - oldPrice;
+            const diffStr = diffVal > 0 ? `+${diffVal.toFixed(2)}` : `${diffVal.toFixed(2)}`;
+            const isAllTimeLow = newPrice < currentLowest;
+            const newLowest = Math.min(currentLowest, newPrice);
+
+            notifications.push({
+              type: 'PRICE_CHANGE',
+              title: item.title,
+              oldPrice: oldPrice.toFixed(2),
+              newPrice: newPrice.toFixed(2),
+              lowestPrice: newLowest.toFixed(2),
+              isAllTimeLow: isAllTimeLow,
+              diff: diffStr,
+              seller: item.sellerUsername,
+              itemUrl: item.itemUrl
+            });
+
+            // Preisänderung in Historie-Tabelle speichern
+            await pool.query(
+              'INSERT INTO price_history (item_id, price) VALUES ($1, $2)',
+              [item.itemId, newPrice]
+            );
+          }
+        }
+
+        // 2. Snapshot aktualisieren (LEAST stellt sicher, dass der lowest_price nie überschrieben wird)
+        await pool.query(`
+          INSERT INTO item_snapshots (
+            item_id, search_id, seller_username, title, price, lowest_price, currency, item_url, image_url
+          )
+          VALUES ($1, $2, $3, $4, $5, $5, $6, $7, $8)
+          ON CONFLICT (item_id) DO UPDATE
+          SET price = EXCLUDED.price,
+              lowest_price = LEAST(item_snapshots.lowest_price, EXCLUDED.price),
+              last_updated = CURRENT_TIMESTAMP
+        `, [
+          item.itemId,
+          search.id,
+          item.sellerUsername,
+          item.title,
+          item.price,
+          item.currency,
+          item.itemUrl,
+          item.imageUrl
+        ]);
+      }
+    }
+
+    return notifications;
+
+  } catch (error) {
+    console.error('❌ Fehler während des Tracking-Durchlaufs:', error.message);
+    return notifications;
+  }
+}
diff --git a/src/tracker_BK_1.js b/src/tracker_BK_1.js
new file mode 100644
index 0000000..8264bc8
--- /dev/null
+++ b/src/tracker_BK_1.js
@@ -0,0 +1,110 @@
+import axios from 'axios';
+import { pool } from './db.js';
+import { searchEbayProducts } from './ebayService.js';
+
+export async function runTrackingCycle(targetWebhookUrl) {
+  console.log(`\n🕒 [${new Date().toISOString()}] Starte Tracking-Durchlauf via n8n Trigger...`);
+
+  const webhookUrl = targetWebhookUrl || process.env.N8N_ALERT_WEBHOOK_URL;
+
+  try {
+    // 1. Alle aktiven Suchaufträge aus Postgres holen
+    const searchesRes = await pool.query('SELECT * FROM tracked_searches WHERE is_active = TRUE');
+    const searches = searchesRes.rows;
+
+    // 2. Verkäufer-Whitelist aus Postgres holen
+    const sellersRes = await pool.query('SELECT username FROM sellers');
+    const sellerList = sellersRes.rows.map(r => r.username);
+
+    if (searches.length === 0) {
+      console.log('ℹ️ Keine aktiven Suchen in der Datenbank.');
+      return { status: 'success', processedSearches: 0, alertsFound: 0 };
+    }
+
+    const alertsToSend = [];
+
+    for (const search of searches) {
+      console.log(`🔎 Prüfe Suche ID ${search.id}: "${search.query}" (Chat: ${search.chat_id})...`);
+
+      const currentItems = await searchEbayProducts(
+        search.query,
+        search.negative_keywords,
+        sellerList
+      );
+
+      for (const item of currentItems) {
+        // Prüfen, ob Artikel bereits in Postgres existiert
+        const existingRes = await pool.query(
+          'SELECT price FROM item_snapshots WHERE item_id = $1',
+          [item.itemId]
+        );
+
+        if (existingRes.rows.length === 0) {
+          // NEUER ARTIKEL
+          await pool.query(`
+            INSERT INTO item_snapshots (item_id, search_id, seller_username, title, price, currency, item_url, image_url)
+            VALUES ($1, $2, $3, $4, $5, $6, $7, $8)
+          `, [item.itemId, search.id, item.sellerUsername, item.title, item.price, item.currency, item.itemUrl, item.imageUrl]);
+
+          alertsToSend.push({
+            type: 'NEW_ITEM',
+            chatId: search.chat_id,
+            searchQuery: search.query,
+            title: item.title,
+            newPrice: item.price,
+            oldPrice: null,
+            currency: item.currency,
+            seller: item.sellerUsername,
+            url: item.itemUrl,
+            imageUrl: item.imageUrl
+          });
+
+        } else {
+          const oldPrice = parseFloat(existingRes.rows[0].price);
+
+          if (item.price < oldPrice) {
+            // PREISSTURZ
+            await pool.query(`
+              UPDATE item_snapshots 
+              SET price = $1, last_updated = CURRENT_TIMESTAMP 
+              WHERE item_id = $2
+            `, [item.price, item.itemId]);
+
+            alertsToSend.push({
+              type: 'PRICE_DROP',
+              chatId: search.chat_id,
+              searchQuery: search.query,
+              title: item.title,
+              newPrice: item.price,
+              oldPrice: oldPrice,
+              currency: item.currency,
+              seller: item.sellerUsername,
+              url: item.itemUrl,
+              imageUrl: item.imageUrl
+            });
+
+          } else {
+            // Unverändert: Timestamp aktualisieren
+            await pool.query('UPDATE item_snapshots SET last_updated = CURRENT_TIMESTAMP WHERE item_id = $1', [item.itemId]);
+          }
+        }
+      }
+    }
+
+    // 3. Alerts per Webhook an n8n senden
+    if (alertsToSend.length > 0 && webhookUrl) {
+      console.log(`🚀 Sende ${alertsToSend.length} Alerts an n8n (${webhookUrl})...`);
+      await axios.post(webhookUrl, { alerts: alertsToSend });
+    }
+
+    return {
+      status: 'success',
+      processedSearches: searches.length,
+      alertsFound: alertsToSend.length
+    };
+
+  } catch (error) {
+    console.error('❌ Fehler im Tracking-Durchlauf:', error.message);
+    throw error;
+  }
+}