Benefits of Hash and UUID for python database?

I am learning python and I came across a code (*) that uses Hash and UUID for storing data in python.
Below is a simpler excerpt for the topic in question.

Basically, when data is passed to DataBase, it hashes data, creates uuid,
then holds them as ._data: {uuid, data} and ._index: {hash value, uuid}.

What are the benefits of using Hash and UUID from the perspective of DBMS? (as opposed to just simply storing them in python built-in classes, like List and Dictionary)

from typing import Dict
import uuid

class DataBase:
    def __init__(self) -> None:
        self._data: Dict[uuid.UUID, Dict] = {}
        self._index: Dict[int, uuid.UUID] = {}

    def insert(self,
               data: Dict[str, int]) -> None:

        keyhash = hash(tuple(data))
        _id = uuid.uuid4()
        self._data[_id] = data
        self._index[keyhash] = _id

db = DataBase()
db.insert(data={'priceA': 5000})
db.insert(data={'priceB': 4000})

...

(*) The original code is an API client that constantly receives data asynchronously via multiple Websocket streaming, and read, update, insert, delete them in their defined Database.