Codebase Migration Plan

This productized sample demonstrates a MySQL to PostgreSQL migration plan against the public Roundcube Webmail codebase. The scenario is grounded in the repository's real engine-specific schemas and migration files.

The plan inventories the current state, maps verified dialect differences, identifies application seams, sequences schema and data migration, defines validation gates, and establishes rollback and cutover controls. It also separates planning evidence from implementation so a buyer can make a proceed, revise, or stop decision before code changes begin.

This format is useful for framework upgrades, cloud moves, database migrations, major dependency transitions, and platform modernization where execution risk must be understood before committing a delivery budget.