When creating a configuration schema definition, one of the first properties used for the configuration namespace is type. This value can be config_object or config_entity. When the type is config_entity, the definition will be used to create a database table rather than to structure the serialized data for the config table.

Entities are powered by the plugin system in Drupal, which means that there is a plugin manager. The default \Drupal\Core\Entity\EntityTypeManager provides discovery and handling of entities. The ConfigEntityType class for the entity type's plugin class will force the setting of the uuid and langcode in the entity_keys definition. The storage handler for configuration entities defaults to \Drupal\Core\Config\Entity\ConfigEntityStorage. The ConfigEntityStorage class interacts with the configuration management system to load, save, and delete custom configuration entities.