zero-downtime-migration

In-depth, runnable guides for MongoDB JSON Schema validation, zero-downtime schema migration, and audit-ready compliance — the open source behind schemavalidation.org.

A set of six modules, five of them hands-on, simulating the database problems that show up at real scale, on PostgreSQL, MySQL, and SQL Server side by side, against the same 29 million row dataset (a hybrid e-commerce/fintech schema containing customers, orders, payments, and a 15-million-row event stream).

Zero-downtime, self-verifying database migration platform. LSN-fenced writes, watermark-based snapshot/CDC, hierarchical digest reconciliation, durable dead letters, and a cutover gate that is a predicate rather than a judgement call. Go, PostgreSQL + MySQL.

Zero-downtime schema changes for PostgreSQL — automatic strategy selection, dry-run previews, and a trust layer that shows exactly what's happening to your database.