Is it possible to detach customer's database without physical deletion from server?
There is no such functionality in Parallels Plesk Automation (PPA) 11.5.
The functionality which you expect from the Parallels Plesk Automation - ability to detach customer's database through Customer Control Panel without physical deletion from server - can be considered as a feature request.
The feature request number #FR-1937181 regarding the matter was created.
Please use provided ID to track maintenance in PPA release notes.
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For obtain a workaround contact Parallels Technical Support.