Generate a Spring Boot service with the following requirements:

1. Use Java 21
2. Use latest Spring Boot GA version
3. Package name: com.example.demo

using Spring Data Rest, PostgreSQL as database
with dependencies: Lombok
with base package: cq.project.reading_companion
with entities:
class Book { String name, String isbn10, String isbn13, Storage storage}
enum Storage { BOX, KINDLE, GOOGLE_PLAY_BOOKS }
class Position { String isbn13, int page, LocalDateTime when }

Java code:
Use the following Lombok annotations whenever applicable:
@Data, @Builder, @NoArgsConstructor, @AllArgsConstructor, @RequiredArgsConstructor
to replace getters, setters, constructors, Builder patterns
Use @EqualsAndHashCode for equals and hashCode methods
Use @Slf4j in all classes to enable logging with SLF4J

For DTO classes
1. Make all fields final
2. Add an all arguments constructor

For constructors or methods with more than 3 arguments, use a new line for every argument
Use var for local variable declaration

Testing:
Use AssertJ for assertions and matchers
Use Testcontainers for integration testing, don't use H2 or any embedded DB

Use @RequiredArgsConstructor for constructor injection for Spring beans,
Use Objects.toString to convert row values if String is needed

For JPA entities:
Use @JdbcType(PostgreSQLEnumJdbcType.class) for mapping PostgreSQL enums

Remove all comments in the source code