Spring Boot 4, Flyway, and Postgres: How Not to Shoot Yourself in the Foot

▤ Summary

This article explains how Spring Boot 4 works with Flyway and PostgreSQL for database migrations. It walks through starter dependencies, auto-configuration, plugin modules, and PostgreSQL-specific behavior such as transactional locks and concurrent index creation. It also covers operational settings like baseline-on-migrate, clean-disabled, out-of-order, mixed, and target. The piece gives practical configuration examples for production-safe migration workflows and test support in Spring Boot 4.x.

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