[brown9-2]

looking at the query logs for the nighttime period should have made the bug fairly obvious

[8n4vidtmkvmk]

They even said they had sentry set up.. they'd notice the duplicate key error immediately.

[ihumanable]

I read the part where they said they poured through "hundreds of sentry logs" and immediately was like "no you didn't."

This is not an error that would be difficult to spot in an error aggregator, it would throw some sort of constraint error with a reasonable error message.