storage/db.js

const fs = require("fs");
const path = require("path");

const base = path.join(__dirname, "../data");

function read(file) {
  const filePath = path.join(base, file);
  if (!fs.existsSync(filePath)) return [];
  return JSON.parse(fs.readFileSync(filePath));
}

function write(file, data) {
  const filePath = path.join(base, file);
  const temp = filePath + ".tmp";

  fs.writeFileSync(temp, JSON.stringify(data, null, 2));
  fs.renameSync(temp, filePath);
}

module.exports = { read, write };