This is an implementation of python-telegram-bot BasePersistence class that uses Google Firebase as persistence back-end. This has a very nice advantage of being able to look at your user_data, chat_data, bot_data and convesations real-time using the firebase web app.

The library obviously requires (but does not install) python-telegram-bot. It also requires and installs officeial library foor Google Firebase: firebase-admin

pip install ptb-firebase-persistence

First of all you need to obtain firebase credentials, that look like this:

{
  "type": "service_account",
  "project_id": "YOUR_ID",
  "private_key_id": "YOUR_PRIVATE_KEY",
  "private_key": "-----BEGIN PRIVATE KEY-----\nMII...EwQ=\n-----END PRIVATE KEY-----\n",
  "client_email": "firebase-adminsdk-SOME_STRING@SOME_DOMAIN.iam.gserviceaccount.com",
  "client_id": "11743776666698009",
  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
  "token_uri": "https://oauth2.googleapis.com/token",
  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/firebase-adminsdk-SOMES_STRING.iam.gserviceaccount.com"
}

and the firebase database url that looks like this, something like https://YOUR_APP.firebaseio.com

Store the database URL in an environment variable FIREBASE_URL and the config as a json string in an environment variable FIREBASE_CREDENTIALS.

After that instantiation is as easy as:

from ptb_firebase_persistence import FirebasePersistence
from telegram.ext import Updater


my_persistence = FirebasePersistence.from_environment()

updater: Updater = Updater(
    'BOT_TOKEN',
    persistence=my_persistence,
    use_context=True,
)

You can also just pass the firebase credentials as URL as simple init params:

from ptb_firebase_persistence import FirebasePersistence
from telegram.ext import Updater


my_persistence = FirebasePersistence(database_url='YOUR_DATABASE_URL', credentials='YOUR_CREDENTIALS_DICT')

updater: Updater = Updater(
    'BOT_TOKEN',
    persistence=my_persistence,
    use_context=True,
)

That's it! You can now watch your data change live on Firebase.