Spring Data JDBC for simple, lightweight database access without JPA complexity.
Covers aggregates, repositories, custom queries, and DDD patterns.
USE WHEN: user mentions "spring data jdbc", "simple database access", "no JPA",
"aggregate roots", "DDD with JDBC", "lightweight ORM", "@MappedCollection"
DO NOT USE FOR: JPA/Hibernate features - use `spring-data-jpa` instead,
reactive database - use `spring-r2dbc` instead, NoSQL - use respective skills