Here's what I did on my *supposed-to-be-stable* branch...

```bash
% git rebase master
First, rewinding head to replay your work on top of it...
Fast-forwarded alpha-0.3.0 to master.
% git status
# On branch alpha-0.3.0
# Your branch is ahead of 'origin/alpha-0.3.0' by 53 commits.
#
nothing to commit (working directory clean)
% git push
Fetching remote heads...
  refs/
  refs/heads/
  refs/tags/
  refs/remotes/
'refs/heads/master': up-to-date
updating 'refs/heads/alpha-0.3.0'
  from cc4b63bebb6e6dd04407f8788938244b78c50285
  to   83c9191dea88d146400853af5eb7555f252001b0
    done
'refs/heads/unstable': up-to-date
Updating remote server info

```

That was all a mistake as I later realized. I'd like to undo this entire process, and revert the alpha-0.3.0 branch back to what it was.

What should I do?