Suggestion: 

Having bulk delete API for repositories will help.

The performance team has requested this as well, as deleting 300 repos takes a while (since our current latency is sitting close to ~500ms, this could take 150s to do.)

we likely would limit this to 100 repositories at a time.  The request should look like:

POST  /repositories/bulk_delete/  

If any one item fails (isn't found), the whole request should fail.

Additional points: 

• We will need to send notifications in a similar way as seen here
• Delete the snapshots associated to each repository, as is done for the delete endpoint here