Handle clone of large repos

At the moment, the index will hang, causing locks on various tables. Should investigate a timeout for the git clone.

A suspicion that exacerbated this issue, a suspicion that:

• A long running request occurs
• The client disconnects
• An error/exception is thrown in the request
• The request teardown does not occur because of the disconnect
• The transaction/lock is left in-place in the database or is incorrectly committed?