Mixpanel change history: Degraded Query API Performance impacting US Projects

Mixpanel reported a major Query API degradation causing HTTP 500 errors and report-loading failures for US Data Residency projects; EU and IN projects were unaffected. It started at 2026-08-26 21:39 UTC and resolved at 2026-08-26 22:45 UTC, lasting 1 h 6 min; a fix was implemented, and no customer data was lost.