Title: Drag & Drop keys
Scope: Configuration
Level: User Goal
Actors: User (usually a sysadmin)
Brief: User drags a key (with a subtree) to a different subtree.

Precondition: View configuration of an instance.
Main success scenario: User moves a key (and its subtree) to another subtree by dragging it to to the desired position.
Alternative scenario: User enters data that violates a validation rule, an error message is shown.
Error scenario: Technical problems while persisting to the key database. The user is informed about the problem.
Postcondition: The updated key structure is persisted to the database.
Non-functional Constraints: -