function json(data, status = 200) {
  return new Response(JSON.stringify(data), {
    status,
    headers: { "content-type": "application/json; charset=UTF-8" },
  });
}

export async function onRequestGet(context) {
  const db = context.env.DB;
  if (!db) {
    return json({ success: false, error: "缺少 D1 绑定 DB" }, 500);
  }

  try {
    const row = await db
      .prepare("SELECT * FROM backup_trades ORDER BY timestamp DESC LIMIT 1")
      .first();

    return json({ success: true, data: row || null });
  } catch (error) {
    return json({ success: false, error: String(error) }, 500);
  }
}