We Ditched MongoDB 8.0 for PostgreSQL 17 and Redis 8.0: Cut Query Time by 60%

After 18 months of fighting MongoDB 8.0's unpredictable p99 latencies, constant index rebuild downtime, and a monthly cloud bill that grew 22% month-over-month, we migrated our 12TB event-sourcing workload to PostgreSQL 17 with Redis 8.0 as a read ca...