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Upstash is a provider of the serverless Redis, Kafka, and QStash APIs.
This notebook goes over how to use Upstash Redis to store chat message history. 
from langchain_community.chat_message_histories import (
    UpstashRedisChatMessageHistory,
)

URL = "<UPSTASH_REDIS_REST_URL>"
TOKEN = "<UPSTASH_REDIS_REST_TOKEN>"

history = UpstashRedisChatMessageHistory(
    url=URL, token=TOKEN, ttl=10, session_id="my-test-session"
)

history.add_user_message("hello llm!")
history.add_ai_message("hello user!")

history.messages