Internal Server Error when connecting Github or deleting account, cannot disable a connection

Something went wrong with the Linear->Github syncing (for Github-created issues) so I tried to 'reset' the connection.

• Clicking "disable" produced this error: Failed to disable issue sync (:github_webhook_disable_failure)
  
• I tried reconnecting the Github, just in case something was going wrong there, and got an Internal Server Error
  
• When I reloaded the page, I got stuck on the login / "connect your Github" flow
  
• Somehow the view changed back to the connections page, so I tried to just delete the account, and again got an Internal Server Error.
• When I reloaded the page, I got this notice: "Failed to delete your LinearSync account, please email justin@93software.com for assistance."
  

I've manually removed the webhooks and plan to create a new connection with a new API key, just filing this bug in case it's helpful for smoothing things out in future. It's no problem now but if I set up 10 syncs in future and then had to manually disable and recreate them, that would be a bit of a headache.

The report names the GitHub connection, issue-sync disable flow, reconnect flow, and account deletion, but no files, tests, or entry points. Start by reproducing the reported sequence and inspecting the errors behind these actions. Done means disabling a sync, reconnecting GitHub, and deleting an account no longer produce server errors or leave the user stuck.