this looks neat, what's the data source and latency?

Looks like Yahoo and the SEC for filings: https://github.com/gloom-sh/gloomberb/tree/cd82b5c61a8d0eb0d...

Which is not great for history, right? Seems like a real detractor.

You pretty much need $30/m subscriptions for historical data. Not that it couldn't be worked into this.

Was just about to ask on data sourcing, I imagine yfinance is used but can't really tell for anything else (like for prediction markets or news data).