Provides a key value backend for entities.
@todo Entities that depend on auto-incrementing serial IDs need to explicitly provide an ID until a generic wrapper around the functionality provided by \Drupal\Core\Database\Connection::nextId() is added and used. @todo Revisions are currently not supported.
Hierarchy
class \Drupal\Core\Entity\EntityHandlerBase uses DependencySerializationTrait, StringTranslationTraitclass \Drupal\Core\Entity\EntityStorageBase implements EntityHandlerInterface, Entity