Spring Data JDBC Lookup Tables Cascading Deletes

I have a structure similar to below. I need to only retrieve the lookup data but not have it deleted/saved/updated when a parent/child is deleted/saved/updated. The data in the lookup table is static. I'm using Sprint Data JDBC with Java 11 with Postgres for the database. I understand this is a contrived example but I am not allowed to post the actual code.

@Data
@Table("parent")
public class ParentDTO {

    @Id
    private long parentId;
    private Date createdAt;
    @MappedCollection(idColumn="parent_id", keyColumn="parent_id")
    private Set<ChildDTO> children;
    String name;
}

@Data
@Table("child")
public class ChildDTO {

    @Id
    private long childId;
    private Date createdAt;
    private long parentId;
    String name;

    @MappedCollection(idColumn="lookup_id", keyColumn="lookup_id")
    private LookupDTO lookupDTO;
}

@Data
@Table("lookup")
public class LookupDTO {

    @Id
    private long lookupId;
    String name;
    private Date createdAt;
}