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const insertNewSale = async () => {
  const timeAdded = new Date();
  const newSale = await salesModel.insertNewSale(timeAdded);
  return newSale;
};

const insertProductIntoSale = async (newSale) => {
  const addNewSale = await insertNewSale();
  const { insertId } = addNewSale;
  await salesModel.insertProductIntoSale(insertId, newSale);
  return insertId;
};