Fix deletion of ssh keys

django_backend/backend/models.py

@@ -348,9 +348,9 @@ class SSHPublicKey(models.Model):
 
     # when a key is withdrawn by a client we try to finally delete it
     def try_final_deletion(self):
-        if (self.deleted
-                and not self.task_items.exists()):
-            self.print('All clients have withdrawn this key. Final deletion')
+        if (self.deleted and not self.tasks.exists()):
+            logger.info(self.msg(
+                'All clients have withdrawn this key. Final deletion'))
             self.delete()
             return
 
@@ -526,6 +526,7 @@ class DeploymentTask(models.Model):
     # maintenance after all task items are done
     def finished(self):
         logger.info(self.msg('done'))
+        self.delete()
 
         # check if this was the final withdraw in a key deletion
         if self.action == 'withdraw':