Paxos has implemented Blue-Green upgrades to improve database maintenance for asset trading, achieving a 50-fold reduction in downtime from 30-120 minutes to approximately one minute. This upgrade strategy allows for real-time synchronization between a blue cluster handling production traffic and a new green cluster with the updated version. Challenges included issues with CREATE ROLE statements disrupting upgrades due to temporary roles and the necessity to drop replication slots before PostgreSQL 17, which could lead to data loss. Additionally, upon the green cluster becoming primary, it acquires a new cluster ID, requiring updates for clients using RDS IAM authentication. The transition to PostgreSQL 17 is anticipated to resolve the need to drop logical replication slots, preserving Change Data Capture (CDC) continuity.