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 ## Data Layer
 
-- **H2** — file-based relational database (`jdbc:h2:file:./data/<appname>`); no external process or Docker needed; data persists between restarts
+- **H2** — in-memory relational database; no external process or Docker needed
 - **Spring Data JPA / Hibernate** — ORM for all persistence; use JPA annotations on all entities
 - **Spring Data repositories** — `JpaRepository` as the base for all repositories