Whoever has followed the mailing lists or IRC has seen remarks that darktable lacks a feature complete file manager. Currently we only have a button which lets the user delete files from disk, but there is no way to move them, copy them, rename them, … Every time someone has shown up to suggest something beyond that we made clear that “darktable is not a file manager”. We even have a FAQ entry about that.
This is a companion discussion topic for the original entry at https://www.darktable.org/2011/04/file-management/