fix: logic to show BSR improvements (rank drops) in green

inspect_user_ads.ts

@@ -0,0 +1,37 @@
+import XLSX from 'xlsx';
+import { readFileSync } from 'fs';
+
+const buf = readFileSync('/Users/christianvidalwolf/github/CrazeAnalytix/docs/plans/Ads_Performance_Export_2026-02-26.xlsx');
+const wb = XLSX.read(buf, { type: 'buffer' });
+
+console.log('Sheets:', wb.SheetNames);
+
+for (const sheetName of wb.SheetNames) {
+    const ws = wb.Sheets[sheetName];
+    const rows: any[] = XLSX.utils.sheet_to_json(ws, { defval: '' });
+
+    if (rows.length === 0) { console.log(`Sheet "${sheetName}" is empty`); continue; }
+
+    console.log(`\n=== Sheet: "${sheetName}" (${rows.length} rows) ===`);
+    const headers = Object.keys(rows[0]);
+    console.log('Columns:', headers.join(' | '));
+    console.log('First 3 rows:');
+    rows.slice(0, 3).forEach(r => console.log(' ', JSON.stringify(r).slice(0, 300)));
+
+    // Look for key columns
+    const weekCol = headers.find(h => /week|woche|semana/i.test(h));
+    const asinCol = headers.find(h => /asin/i.test(h));
+    const countryCol = headers.find(h => /country|marketplace|portfolio|land|país/i.test(h));
+    const costCol = headers.find(h => /^cost$|^spend$|^ausgaben$|^gasto$/i.test(h) || (/cost|spend/i.test(h) && !/acos|of sales/i.test(h)));
+    const salesCol = headers.find(h => /sales|umsatz|ventas/i.test(h) && !/acos|cost of/i.test(h));
+
+    console.log(`\nKey columns: week="${weekCol}" | asin="${asinCol}" | country="${countryCol}" | cost="${costCol}" | sales="${salesCol}"`);
+
+    if (weekCol && costCol) {
+        const weeks = [...new Set(rows.map(r => r[weekCol!]))];
+        console.log('Unique weeks:', weeks.sort());
+        const totalCost = rows.reduce((s, r) => s + (parseFloat(String(r[costCol!]).replace(',', '.')) || 0), 0);
+        const totalSales = salesCol ? rows.reduce((s, r) => s + (parseFloat(String(r[salesCol!]).replace(',', '.')) || 0), 0) : 0;
+        console.log(`Total cost: ${totalCost.toFixed(2)}, Total sales: ${totalSales.toFixed(2)}`);
+    }
+}