title: How can i clear the MUC history in Ejabberd
body: <p>I have an application with chatting functionality which support group chat also. In my app i have many public groups, now i want to clear the MUC history of an existing public group without destroy that group. </p>
  
  <p>Actually this group have many users and i don't want to miss anyone of them and i can't be force to anyone of them to join this group again.</p>
  
  <p>I can try history_size: 0 but the problem for this is, group history will never come and that is not my requirement. I just want to clear group history once. </p>
  
  <p>I have read on a link that Ejabberd doesn't provide any method for the room admins to clean the message queue. Is this true? </p>