A user can't be deleted in LibreSource… If you do so you may crash your Libresource. For more information check this
Bug. Which is not a bug.
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The accountstatus_ is used for tigase to set if a user has the right to login or not. In the coming version of Libresource, this field is used also inside libresource in order to allow or not a user to loggin. And by this way, the root user can disable/enable a user account without deleting it.