Backend crashed on startup with 'Schema validation: missing table
[audit_events]'. Root cause: this is Spring Boot 4.0.6, which modularized
autoconfiguration. FlywayAutoConfiguration moved out of spring-boot-autoconfigure
into a dedicated spring-boot-flyway module that is only pulled in by
spring-boot-starter-flyway. The pom only had flyway-database-postgresql
(+ transitive flyway-core) but NOT the starter, so spring.flyway.enabled=true
was inert: no migrations ran, flyway_schema_history was never created, and
Hibernate ddl-auto=validate failed on the empty schema.
Adds spring-boot-starter-flyway (autoconfigure module + flyway-core); keeps
flyway-database-postgresql for the Postgres dialect.
Ref: https://spring.io/blog/2025/10/28/modularizing-spring-boot/
Patrick Plate
8490da4705