500 errors from API service when postgres restarted

To reproduce:

sudo add-apt-repository ppa:landscape/self-hosted-beta
sudo apt install landscape-server-quickstart

Go to your web UI, set up your first admin, then go to /new_dashboard. It should function properly.

sudo systemctl restart postgresql

Now clicking around the web UI in the new portal will result in 500 errors. /var/log/landscape-server/api.log shows this error for each request:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/twisted/web/server.py", line 227, in process
    self.render(resrc)
  File "/usr/lib/python3/dist-packages/twisted/web/server.py", line 292, in render
    body = resrc.render(self)
  File "/opt/canonical/landscape/canonical/landscape/api/resource.py", line 247, in render
    request.setHeader("Access-Control-Allow-Origin", get_root_origin())
  File "/opt/canonical/landscape/canonical/landscape/model/configuration.py", line 286, in get_root_origin
    root_url = get_root_url()
  File "/opt/canonical/landscape/canonical/landscape/model/configuration.py", line 267, in get_root_url
    url = db_config.get(LANDSCAPE_ROOT_URL)
  File "/opt/canonical/landscape/canonical/landscape/model/configuration.py", line 228, in get
    result = store.execute(
  File "/usr/lib/python3/dist-packages/storm/store.py", line 118, in execute
    return self._connection.execute(statement, params, noresult)
  File "/usr/lib/python3/dist-packages/storm/databases/postgres.py", line 306, in execute
    return Connection.execute(self, statement, params, noresult)
  File "/usr/lib/python3/dist-packages/storm/database.py", line 315, in execute
    self._ensure_connected()
  File "/usr/lib/python3/dist-packages/storm/database.py", line 505, in _ensure_connected
    raise DisconnectionError("Already disconnected")
storm.exceptions.DisconnectionError: Already disconnected