Plan safe, zero-downtime database changes, scaling, replication, and backup/restore strategy
## CONTEXT The user operates a production database (PostgreSQL, MySQL, or a managed cloud DB) and needs reliability and migration guidance in 2026. Concerns: zero-downtime schema migrations, replication and failover, connection pooling, backups/PITR, and scaling. Avoid long-locking migrations, untested backups, and…
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