isEnforcedByConstraint example

$payload = ['id' => Uuid::fromHexToBytes($key), $field => null];

                $primary = EntityHydrator::encodePrimaryKey($affectedDefinition, ['id' => $key], $writeContext->getContext());

                $existence = new EntityExistence($affectedDefinition->getEntityName(), $primary, true, false, false, []);

                if ($definition->isVersionAware()) {
                    $versionField = str_replace('_id', '_version_id', $field);
                    $payload[$versionField] = null;
                }

                $queue->add($affectedDefinition, new SetNullOnDeleteCommand($affectedDefinition, $payload, $primary, $existence, '', $flag->isEnforcedByConstraint()));
            }
        }
    }

    /** * @param array<mixed> $ids * * @return array<mixed> */
    private function resolvePrimaryKeys(array $ids, EntityDefinition $definition, WriteContext $writeContext): array
    {