unable to remove a 'completed' import

[hrafnfloki]

I have noticed that after importing transactions, I can no longer delete the upload from the /imports page. This is an issue because if I make a mistake when importing thousands of transactions, it would be very time consuming to manually delete each entry. The only way I can delete these now is by navigating to /transactions and selecting all boxes, and then deleting one page at a time, which is a lengthy task since only 50 entries can be displayed on a single page.

[zachgoll]

I think what we might want to do for this scenario is add some sort of "Undo" button to an import that moves it from completed to pending again.

At that point, the user can decide whether they want to amend the import data and retry or fully delete the import.