code: def insert_unique(table, data, unique_fields=None, *, raise_if_found=False):
      
      item = find_unique(table, data, unique_fields)
      if item is not None:
          if raise_if_found:
              raise NotUniqueItemError('Not expected to find an item with the same '
                                       'values for {}. Inserting {} got {} in eid {}.'.format(unique_fields,
                                                                                              data,
                                                                                              table.get(eid=item),
                                                                                              item))
          else:
              return item
  
      return table.insert(data)
docs: Insert `data` into `table` ensuring that data has unique values
      in `table` for the fields listed in `unique_fields`.
  
      If `raise_if_found` is True, will raise an NotUniqueItemError if
      another item with the same `unique_fields` values are found
      previously in `table`.
      If False, will return the `eid` from the item found.
  
      Parameters
      ----------
      table: tinydb.Table
  
      data: dict
  
      unique_fields: list of str
          Name of fields (keys) from `data` which are going to be used to build
          a sample to look for exactly the same values in the database.
          If None, will use every key in `data`.
  
      raise_if_found: bool
  
      Returns
      -------
      eid: int
          Id of the object inserted or the one found with same `unique_fields`.
  
      Raises
      ------
      MoreThanOneItemError
          Raise even with `raise_with_found` == False if it finds more than one item
          with the same values as the sample.
  
      NotUniqueItemError
          If `raise_if_found` is True and an item with the same `unique_fields`
          values from `data` is found in `table`.