This is kind of embarrassing to admit, but I wanted to use Motes of Light and accidentally deleted all my Armor Materials. The thing is that it turns out I'm not the only one amongst my fellow guardians who has done just that. The problem is that the whole process was so fast I didn't even understand what happened until it was too late. Maybe an alert if you try to scrap more than 100 items or so would be nice? Or why not a trashcan or undo feature, as in many other applications? I scrapped +600 items before I understood what was going on :-(