I'm trying to set up PostgresStore in LangGraph and deploy it to LangGraph Platform.
Postgres server is on Google Cloud Platform, so there's no straightforward way to connect to it using psycopg (which is required by langgraph.store.postgres.PostgresStore constructor).
Is there a way to do this, possibly without a Cloud SQL Auth Proxy?
Also, in LangGraph Platform server logs, there's a line:
No LANGGRAPH_STORE configuration found, using default configuration
There's no single document found by Google that mentions LANGGRAPH_STORE (and how to set it up), and what's the default configuration.