At Google, the monorepo VCS has monotonic IDs like this for changes. Unfortunately a few years ago when approaching some round number, the system was DOS'd by p

At Google, the monorepo VCS has monotonic IDs like this for changes. Unfortunately a few years ago when approaching some round number, the system was DOS'd by people running scripts trying to snag the ID. So now it skips IDs in the vicinity of big round numbers :( I think there's probably a lesson in there about schema design...