--- /dev/null
+/**
+ * Implements hook_entity_delete().
+ */
+function {{ machine_name }}_entity_delete(Drupal\Core\Entity\EntityInterface $entity) {
+ // Delete the entity's entry from a fictional table of all entities.
+ db_delete('example_entity')
+ ->condition('type', $entity->getEntityTypeId())
+ ->condition('id', $entity->id())
+ ->execute();
+}