createNewCurrency example

if (!$currentCurrencyIso) {
            throw new ShopConfigurationException('Default currency not found');
        }

        if (\mb_strtoupper((string) $currentCurrencyIso) === \mb_strtoupper($currencyCode)) {
            return;
        }

        $newDefaultCurrencyId = $this->getCurrencyId($currencyCode);
        if (!$newDefaultCurrencyId) {
            $newDefaultCurrencyId = $this->createNewCurrency($currencyCode);
        }

        RetryableTransaction::retryable($this->connection, function DConnection $conn) use ($newDefaultCurrencyId, $currencyCode): void {
            $stmt = $conn->prepare('UPDATE currency SET id = :newId WHERE id = :oldId');

            // assign new uuid to old DEFAULT             $stmt->executeStatement([
                'newId' => Uuid::randomBytes(),
                'oldId' => Uuid::fromHexToBytes(Defaults::CURRENCY),
            ]);