JPA Entity Mapping for Kotlin Kotlin's is natural for DTOs but dangerous for JPA entities. Hibernate relies on identity semantics that breaks: / over all fields corrupts / membership after state changes, and auto-generated creates detached duplicates of managed entities. This skill teaches correct entity design, identity strategies, and uniqueness constraints for Kotlin + Spring Data JPA projects. Entity Design Rules - Never use for JPA entities. Use a regular . Keep for DTOs. - Keep transport DTOs and persistence entities separate unless the project clearly uses a shared model. - Model requi…