Data Freshness

// ❌ Don't do this
const cachedMenu = localStorage.getItem('menu');
if (cachedMenu && !isExpired(cachedMenu)) {
  return JSON.parse(cachedMenu);
}
const menu = await fetchMenu();
localStorage.setItem('menu', JSON.stringify(menu));

// ✅ Do this instead
const menu = await fetchMenu();

// ❌ Don't do this
fetch(url, {
  headers: {
    'Cache-Control': 'max-age=300'
  }
});

// ✅ Just call the API
fetch(url);

// ❌ Don't do this
const allDishes = await fetchAllDishes();
const dish = allDishes.find(d => d.id === dishId);

// ✅ Fetch what you need when you need it
const dish = await fetchDish(dishId);

// Filter options can be cached for a few minutes
const FILTER_OPTIONS_TTL = 5 * 60 * 1000; // 5 minutes

async function getFilterOptions() {
  const cached = filterOptionsCache.get(chainId);
  if (cached && Date.now() - cached.timestamp < FILTER_OPTIONS_TTL) {
    return cached.data;
  }

  const data = await fetchFilterOptions();
  filterOptionsCache.set(chainId, { data, timestamp: Date.now() });
  return data;
}