I looked into a bit of history here. It appears that https://review.openstack.org/#/c/22694/ moved the database size from 64 to 255, but didn't fix the code to completely take advantage of it.
I looked into a bit of history here. It appears that https:/ /review. openstack. org/#/c/ 22694/ moved the database size from 64 to 255, but didn't fix the code to completely take advantage of it.