List what happened since my last look. Needs one of bookings:read, payments:read, inbox:read, account:read: the one of the file's family (profile: user_avatar, user_cover; content: post_media, mix_audio, mix_cover, live_event_cover, live_event_flyer; inbox: message_attachment, message_voice; bookings: proposal_document). A connected app never uploads proposal_signature or proposal_pdf: signing is done on DJfindr. A feed, oldest first: cursor is always set, at the end too, and remaining counts what follows it (at most 1,000). Store cursor and send it back as since on the next poll; the first poll sends a time as since, or nothing for the last 24 hours. Events are kept 30 days: a cursor unused while later events were deleted is 409 cursor_expired.