App.tsx

  useAsyncEffect(async () => {
    let borrowerData;

    try {
      borrowerData = JSON.parse(window.localStorage.getItem('borrowerData'));
      borrowerData = borrowerData[market] || {};
    } catch(e) {
      borrowerData = {};
    }

    if ((!borrowerData.lastFetch || borrowerData.lastFetch < (Date.now() - 60 * 1000)) && market) {
      const res = await fetch(`http://localhost:3000/borrowers/${market}`);
      borrowerData = await res.json();
      borrowerData.lastFetch = Date.now();
      window.localStorage.setItem('borrowerData', JSON.stringify({ [market]: borrowerData }));
    }

    setBorrowers(borrowerData);
  }, [web3, timer]);