Challenge: Legacy single-node PostgreSQL experienced 45+ min recovery times during peaks.

Solution: Patroni 3.3 HA across 3 AZs, synchronous replication, automated failover <30s.

Challenge: 24x7 clinical operations required zero data loss and <1 hour downtime.

Solution: GoldenGate 23ai + AWS DMS continuous sync, 47-minute cutover.

Challenge: 500M+ documents, poor keyword search relevance, 2-4 second latency.

Solution: pgvector 0.8 + Weaviate 4.6 RAG with hybrid BM25+vector.

Challenge: SQL Server 2019 timeouts on 5B+ CDR records.

Solution: Upgraded to SQL Server 2022 with columnstore indexes and partitioning.

Challenge: Manual provisioning took 3-5 days with configuration drift.

Solution: Terraform 1.8 + GitHub Actions GitOps + Ansible.

Challenge: Overnight batch ETL delayed insights and degraded OLTP.

Solution: Kafka 3.7 + ClickHouse 24.8 real-time CDC pipeline.

Challenge: Single-node BI platforms violated FINRA/SEC reporting availability requirements.

Solution: Tableau Server 2024.1 3-node cluster + Superset 4.1 on Kubernetes with Redis 7.2.