{"message":"Backend API is running on Cloudflare Workers","availableEndpoints":["GET /api/spreadsheet/{spreadsheetId}/data - Read spreadsheet data","GET /api/spreadsheet/{spreadsheetId}/sheets - List all sheets","POST /api/delete-transaction - Delete a row","GET /api/debug-sheets - Test connection","GET /api/health - Health check"],"usage":{"readData":"GET /api/spreadsheet/YOUR_SPREADSHEET_ID/data?sheet=SheetName&range=A1:Z100","listSheets":"GET /api/spreadsheet/YOUR_SPREADSHEET_ID/sheets"}}