What are the migration paths between them?

I need to clarify what you're asking. The term "migration paths between them" could mean several things in this context:

1. Data migration between LangGraph and FastAPI: These are fundamentally different projects—LangGraph is an orchestration framework for building stateful agents, while FastAPI is a web framework for building APIs. They don't have a direct migration path; they solve different problems.

2. Database migrations within each project: Both repositories use database migrations, but in different contexts:

   • LangGraph has migration systems in its store implementations (SQLite and PostgreSQL) for managing schema versions [langchain-ai/langgraph libs/checkpoint-sqlite/langgraph/store/sqlite/aio.py:L161-L200] and [langchain-ai/langgraph libs/checkpoint-postgres/langgraph/store/postgres/base.py:L55-L150]
   • FastAPI doesn't have built-in migrations; it's a web framework that typically integrates with other tools for database management

3. Upgrading or switching between the two: You might be asking if you can migrate an application from one to the other, but they address different architectural layers.

Could you clarify what you mean by "migration paths between them"? For example:

• Are you asking how to use LangGraph with a FastAPI application?
• Are you asking about database schema migrations within one of these projects?
• Something else?

FOLLOW_UPS:

• How to integrate LangGraph with FastAPI?
• What database backends does LangGraph support?
• What are LangGraph's core components?