[habitue]

2. Typescript is the language they're using. Generally people don't change their entire codebase to a different language because they run across a bug that would have been hypothetically solved by a different language. Additionally, this is a validation / coercion issue. It is a risk at the boundary of any two systems, you have to translate network bytes into a type your type system understands. If you translate it wrong, the type system is helpless to save you.

1. A streaming database isn't necessarily what they need here, postgres is plenty fast for most use cases. I'd move to a specialized tool like materialize if they've squeezed all of the juice out of postgres.

3. Postgres doesn't have audit tables built in, though there are multiple tools and plugins for postgres that can hook into things and do it for you. They went with a custom trigger solution, maybe that was sufficient for their use case.