Fix user ID always default on every shell session.

changelog/5117.improvement.rst

@@ -0,0 +1,2 @@
+New user ID will be generated for each shell session.
+Previously the user ID was always 'default'.

rasa/core/channels/console.py

@@ -1,5 +1,6 @@
 # this builtin is needed so we can overwrite in test
 import json
+import uuid
 import logging
 import asyncio
 from typing import Text, Optional, Dict, List
@@ -12,7 +13,6 @@
 from rasa.cli import utils as cli_utils
 from rasa.core import utils
 from rasa.core.channels.channel import RestInput
-from rasa.core.channels.channel import UserMessage
 from rasa.core.constants import DEFAULT_SERVER_URL
 from rasa.core.interpreter import INTENT_MESSAGE_PREFIX
 from rasa.utils.io import DEFAULT_ENCODING
@@ -111,7 +111,7 @@ async def send_message_receive_stream(
 async def record_messages(
     server_url=DEFAULT_SERVER_URL,
     auth_token="",
-    sender_id=UserMessage.DEFAULT_SENDER_ID,
+    sender_id=uuid.uuid4().hex,
     max_message_limit=None,
     use_response_stream=True,
 ) -> int: