Comment 1 for bug 1870751

Share group types suffer from the same behavior: https://opendev.org/openstack/manila/src/commit/35e82746e8a61226a456daa8ca83ee52e2300f36/manila/db/sqlalchemy/api.py#L5079-L5101

These ghost entries cannot be cleaned up by manila or the `manila-manage db purge` tooling - will require manual intervention.