don't dispose

alphamind/data/engines/sqlengine.py

@@ -113,7 +113,6 @@ class SqlEngine(object):
 
     def __del__(self):
         if self.session:
-            self.engine.dispose()
             self.session.close()
 
     def __enter__(self):
@@ -121,7 +120,6 @@ class SqlEngine(object):
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         if self.session:
-            self.engine.dispose()
             self.session.close()
 
     def create_session(self):