Function updateName

backend/src/dal/user.ts:163–187

(
  uid: string,
  name: string,
  previousName: string,
)

}

export async function updateName(
  uid: string,
  name: string,
  previousName: string,
): Promise<void> {
  if (name === previousName) {
    throw new MonkeyError(400, "New name is the same as the old name");
  }

  if (
    name?.toLowerCase() !== previousName?.toLowerCase() &&
    !(await isNameAvailable(name, uid))
  ) {
    throw new MonkeyError(409, "Username already taken", name);
  }

  await getUsersCollection().updateOne(
    { uid },
    {
      $set: { name, lastNameChange: Date.now() },
      $unset: { needsToChangeName: "" },
      $push: { nameHistory: previousName },
    },
  );
}

export async function flagForNameChange(uid: string): Promise<void> {
  await getUsersCollection().updateOne(