[rules-users] How do sessions get removed from the database ?

Hi, I am using StatefulKnowledgeSession and JPA for persistence. I create a session for each Drools Flow process I start, so there is a 1 to 1 mapping between the session and the process. When the process ends, I can see the process gets removed from the database. How can the session be removed from the database as well ? Do I need to do that manually ? Thanks