You can’t, at least not easily. Here’s why:
You would need the following info:
- the user id
- the date in UTC the bulk deletion happened
- the post ID of each deleted topic’s OP
- advanced knowledge of using the rails console and/or psql directly to run a very advanced SQL query as you need to clear the deleted_at field on both the topic itself and the post that is the OP of the topic.
And please don’t ask why I know this…