My app has a session object stored in the database with information like who the caller is, their ID, and some other information I want the AI to have access to so it can make tool calls properly. Wha'ts the recommended way to provide the entire session object to the AI so it has it in it's context?

To give your Vapi assistant session context, pass the data using assistant overrides variable values when starting the call or send it as a system message during the call.