Sessions

In hosted mode the component may:

Start a session with { importerId }
Complete a session with { validRows, invalidRows, fileType, durationMs }

Never sent

File bytes, filenames, headers, mapped cells, or normalized row payloads.

Why it exists

Usage and operations without putting Bootstrapware on the data path. Session start/complete failures do not block a successful local import; onComplete still runs in the browser.