title: How to update time-to-live(TTL) of existing records in Cassandra DB?
body: <p>As Cassandra DB is providing a option to set Time-to-live(TTL) value to automatically delete the record on the basis of TTL value set with record. I have a case that user can change the date of data expiry, means user can change the data expiration date any time.</p>
  
  <p><strong>Case:</strong>  </p>
  
  <ol>
  <li>Suppose default expiration period is 10 days.</li>
  <li>Then inserted some records with setting TTL for 10 days.</li>
  <li>after 2 days user change expiration period to 30 days.</li>
  <li>But the previous data inserted with 10 days TTL period automatically gets deleted after 10 days instead of 30 days.</li>
  </ol>
  
  <p><strong>Requirement:</strong> Whenever user changes the expiration period through UI, we wanted to change TTL in database.
      Is there any option to update the TTL for records in Cassandra DB.         </p>