The notifier RepositoryWorkItem and PullRequestWorkItem have a clash between directory location for the history repos. In RepositoryWorkItem we store the tags and branches history in these directories:

<scratch>/notify/history/tags
<scratch>/notify/history/branches

While in the PullRequestWorkItem, the history is stored in:

<scratch>/notify/history

Having repositories nested inside each other like this is causing inefficiencies at the very least, but could also potentially be harmful. As a quick fix, I propose we move the pr history to

 <scratch>/notify/history/pr