SALAAAAAM

// First, we start a transaction from your connection and save it into a variable
const t = await sequelize.transaction();

try {
  // Then, we do some calls passing this transaction as an option:

  const user = await User.create(
    {
      firstName: 'Bart',
      lastName: 'Simpson',
    },
    { transaction: t },
  );

  await user.addSibling(
    {
      firstName: 'Lisa',
      lastName: 'Simpson',
    },
    { transaction: t },
  );

  // If the execution reaches this line, no errors were thrown.
  // We commit the transaction.
  await t.commit();
} catch (error) {
  // If the execution reaches this line, an error was thrown.
  // We rollback the transaction.
  await t.rollback();
}