How to delete an entire uploaded file of duplicate transactions?

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

1. 1
   Spot checking a few days and bulk reclassing the rest
2. 2
   Changing the recording workflow to use Undeposited Funds instead of depositing directly to the bank
3. 3
   Exporting transactions with a filter, sorting by amount, and reviewing for missing duplicates using Excel
4. 4
   Restoring from a backup made prior to the import
5. 5
   Deleting all pending transactions and re-importing
6. 6
   Going through and deleting duplicated transactions one by one manually
7. 7
   Bulk excluding the transactions and then deleting them in bulk
8. 8
   Bulk accepting the transactions and creating a journal entry (JE) to reverse them

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.