Keeper change history: Vault login errors - resolved

Keeper reported a critical outage causing vault login errors affecting the Keeper Admin Console (US) and Keeper Web Vault (US), starting 2025-06-24 15:27 UTC and resolved at 2025-06-24 16:01 UTC (33 min). Large BreachWatch updates triggered database lock contention, exacerbated by a backend migration doubling parallel updates; engineering planned a preventative solution.