Bitbucket : Reducing repository size : what about pull requests ?

[cblinbeasyness]

I've a warning saying that my repo size is over 1GB and so I should reduce its size.

I've read https://confluence.atlassian.com/bitbucket/reduce-repository-size-321848262.html and, from what I understand, I should have not committed some big binary files.

My question is : if I do rewrite the GIT history to remove these files (with BFG), will the pull requests were I have pushed them be still available ?

Otherwise, as I have multiple projects in the same repo, is it better (for eah project) to

1. clone the repo

2.rewrite the history to keep only the current project folder

3. push the repo to a new one (thus, should keep the history of files in the folder)

Thanks for any pointers, I am not very confident with all this "rewrite history" stuff

Note : I also use trello boards with the bitbucket addon, if that matters ...