`App\Core\Doctrine\Timestampable` is a trait usuble in an entity. It adds `createdAt and updatedAt` datetime attributes with the setters and the getters :
*`setCreatedAt(?\DateTime $createdAt): self`
*`setUpdated(?\DateTime $createdAt): self`
*`getCreatedAt(): ?\DateTime`
*`getUpdatedAt(): ?\DateTime`
When the entity is created or updated, `createdAt` and `updatedAt` are automatically updated to.