title: Redis: How to give an unique id to hashes
body: <p>I want to save my users information in hashes. I want to create a hash for each user in the application.
  The hashes name is like this: "user:1001"<br>
  Now, i want to users id start from 1000 and increase by one.<br>
  how can i do this? <br>
  thanks</p>