Why is "SQLAlchemy" not an optional dependency?

[alonme-loops]

Why is SQLAlchemy a required dependency? there are many use cases for Langchain that don't require SQLA.

This is an issue for me as i want to integrate langchain into an older codebase which uses SQLA older than 1.4

[leo-gan]

It is also a problem for me. If I install many integrations simultaneously, SQLAlchemy gives me an error on the versioning of packages. It looks like SQLAlchemy is not good at keeping up speed with the updates. This is a big issue in production when we need to address the security problems with package updates.