HA + DR: failover playbooks, backup automation, RTO/RPO runbooks #356
Description
Context
Enterprise customers require documented and automated disaster recovery capabilities.
Scope
- Active-passive failover playbooks (automated health check → failover trigger)
- PostgreSQL backup automation (pg_basebackup + WAL archiving + point-in-time recovery)
- Redis backup/restore for cache state
- RTO/RPO documentation and validation testing
- Terraform modules for multi-region deployment
- Admin UI: backup status, last successful backup, recovery test results
References
- ADR-0024: Enterprise tier feature (Deployment Options pillar)