This fixes #5115, and also removes a spurious deadlock condition whereby the relayer and burnchain downloader can fight over the sortition DB (this arises due to the fact that we open a transaction on the sortition DB every time we open it, even though we almost never need to).
This fixes #5115, and also removes a spurious deadlock condition whereby the relayer and burnchain downloader can fight over the sortition DB (this arises due to the fact that we open a transaction on the sortition DB every time we open it, even though we almost never need to).