Goal: 

< Goal based statement, with context - remove these notes before saving -->

• Implement a batch-mode to cinder-manage db purge to prevent failures
• Make the patch ready for review  and  verified  by  Gate.
  • https://review.opendev.org/c/openstack/cinder/+/950927/

Acceptance Criteria:

• Issue can be reproduce locally
• Implement the fix and it should fix the actual issue locally
• Make the patch ready for review
• the patch should pass all the upstream gates.