Sodium is built API-first. The application you use every day is built on the same API we publish — so there is no screen in Sodium whose data isn't also available programmatically. Clients, contacts, services, tasks, time entries, notes, emails, billing: every single piece of your data can be read over the API, automatically, whenever you want it.
That's a structural guarantee, not a promise. In systems where the export is a bolt-on, it covers whatever someone remembered to include. In an API-first system, if the data exists, it's reachable — because the app itself couldn't work otherwise.