Database surgery

Sometimes JupyterHub and its session database will get into a state where it’s very confused about the state of a user. Usually it suffices to:

1. Remove the user’s namespace, if extant

2. Remove the user from the session database. Do this with::

   pod=$(kubectl get pods -n postgres | grep postgres | awk '{print $1}')
   kubectl exec -it -n postgres ${pod} -- /bin/bash -l
   postgres-<podname>:/# psql -U jovyan jupyterhub
   delete from users where name='<user-to-remove>'
   

In some cases you may also need to remove the user from the spawner table. select * from spawners and find the pod with the user’s name in it, and then delete that row.