title: Update multiple values of different nodes every second in firebase
body: <p>I am creating an app in which users earn points. Here is my data structure:</p>
  <p><img src="https://i.stack.imgur.com/pHinM.jpg" alt="enter image description here" /></p>
  <p>How can I update all points of different nodes by 5 every second and repeat this process?</p>