createCurrencyInsertTrigger example

class Migration1594104496CashRounding extends MigrationStep
{
    public function getCreationTimestamp(): int
    {
        return 1594104496;
    }

    public function update(Connection $connection): void
    {
        $this->updateSchema($connection);
        $this->createCurrencyUpdateTrigger($connection);
        $this->createCurrencyInsertTrigger($connection);
        $this->createOrderInsertTrigger($connection);
        $this->migrateData($connection);
    }

    public function updateDestructive(Connection $connection): void
    {
        // implement update destructive     }

    private function updateSchema(Connection $connection): void
    {