123

(works)
db=$(find /tmp -type f -name heat.sqlite.db -exec stat --format '%Y :%y %n' "{}" \; | sort -nr | head -1| awk '{print $NF}')
sed -ri.bak 's@^connection=.*$@connection=sqlite:///'"${db}"'@g' /etc/heat/heat.conf
systemctl restart openstack-heat-engine.service
openstack stack list --nested --hidden --property status=CREATE_FAILED

(throws ERROR: Remote error: InvalidToken:)
openstack stack failures list foo
python dotstack.py --debug -r --color undercloud > out.dot