Instant.now().toEpochMilli()

• controller user
• daftarkan user dulu atau menggunakan endpoint addUser
• test user harus menyertakan userDetails artinya kita menggunaka Authentication dan Authorization

@Query("SELECT t FROM Transaction t WHERE t.property IN (?1) AND t.createdAt BETWEEN ?2 AND ?3 GROUP BY t.transactionType") List getAllByPropertyAndDatesBetweenGroupedByTransactionType(Set property, Date dateFrom, Date dateTo);

@Query(value = "SELECT u FROM User u WHERE u.name IN :names") List findUserByNameList(@Param("names") Collection names);

Set findByIdIn(Set ids);

CascadeType.PERSIST : cascade type presist means that save() or persist() operations cascade to related entities. CascadeType.MERGE : cascade type merge means that related entities are merged when the owning entity is merged. CascadeType.REFRESH : cascade type refresh does the same thing for the refresh() operation. CascadeType.REMOVE : cascade type remove removes all related entities association with this setting when the owning entity is deleted. CascadeType.DETACH : cascade type detach detaches all related entities if a “manual detach” occurs. CascadeType.ALL : cascade type all is shorthand for all of the above cascade operations.

The orphanRemoval option was introduced in JPA 2.0. This provides a way to delete orphaned entities from the database. While CascadeType.REMOVE is a way to delete a child entity or entities whenever the deletion of its parent happens.