The ExpiryLock class in WikibaseQualityConstraints currently passes a Unix timestamp as the TTL into BagOStuff. This pattern has caused problems in the past (T286260), and we should stop doing that and use a relative expiry (number of seconds) instead.
Acceptance Criteria: 🏕️🌟(September 2021):
- BagOStuff::set() no longer gets called with a Unix timestamp as the third parameter