[specref] Downtime post-mortem

Hi all,

Sorry Specref was down for a number of hours overnight as I deployed a
buggy app refactor and failed to see that the app was crashing despite
checking the logs.

Lessons learned:
- the app needs tests, not only the data,
- Papertrail logs don't differentiate enough failed and served requests,
so check the app too,
- Don't push code late a night.

Apologies,

--tobie