I submitted a ticket. I agree with your advice. I've just been mass inputting the last few days. Never even thought about it. Lessons learned.

I went to add the last 100 cards I had added to my inventory to a deck and accidentally hit the delete selected instead of add to deck not only killing an hour work but also removing cards that where multiples that had been added from previous boxes/folders.

Ps anyone know how to undo this as this has created a large missing chunk of already inventoried cards

And extended art cards too!