pg-migrations

Zero-downtime PostgreSQL migrations across tenant schemas are automated using a bounded worker pool to apply changes in parallel. This ensures every active schema receives updates concurrently during deployment without blocking database operations.

Three-phase column changes for multi-tenant Postgres databases involve phased additions, safe renames, and non-blocking index creation outside transactions. This strategy prevents locking issues and ensures migrations apply seamlessly across all active tenant schemas.

Parallel schema migration with a bounded worker pool applies updates across tenant schemas concurrently up to a configurable concurrency cap. This orchestrates efficient deployment while preventing database overload during multi-tenant migration execution.

A tenant registry is required to apply schema-per-tenant migrations. The system uses this registry to identify active tenants, alongside migration templates with a :schema placeholder, to target and execute migrations across all specific schemas.

Multi-tenant PostgreSQL migrations can be rolled back if a deployment fails. The system supports up/down migration pairing and robust rollback capabilities to ensure all tenants are kept in sync and restored to previous states.

Database changes across all tenant schemas are tracked using audit trigger setup and partitioned logs. This provides observability and change tracking across all tables, ensuring deployment readiness and synchronized tenant states.