ensure database connection removal activated again

lib/docker_client.rb

@@ -174,8 +174,8 @@ class DockerClient
     We need to start a second thread to kill the websocket connection,
     as it is impossible to determine whether further input is requested.
     """
+    begin
       @thread = Thread.new do
-      #begin
           timeout = @execution_environment.permitted_execution_time.to_i # seconds
           sleep(timeout)
           if container.status != :returned
@@ -186,10 +186,10 @@ class DockerClient
             end
             kill_container(container)
           end
-      # ensure
-        # #guarantee that the thread is releasing the DB connection after it is done
-        # ActiveRecord::Base.connectionpool.releaseconnection
-      # end
+      end
+    ensure
+      # guarantee that the thread is releasing the DB connection after it is done
+      ActiveRecord::Base.connectionpool.releaseconnection
     end
   end