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Before going into the database and tweaking entries there you can check the /var/log/cinder/volume log to see if volume in question is reported as 'in use'. If yes you can follow the procedure here https://ask.openstack.org/en/question/87725/failed-to-delete-a-volume-as-the-backend-lv-is-shown-open/ which worked really well for me.

HTH.