Read rows viewers appended to a data table from the page (plain form, POST ./_data/ or the SDK space.data.append; sign-ups, check-ins, votes, feedback), newest first. Each row carries its status (approved: passed moderation, visible to viewers; held: flagged by moderation, visible only to the publisher), who submitted it (by: a member is {kind:member, user_id, role, nickname}, a visitor is {kind:visitor}), device, time, and the page version and data version at write time. These rows are not in get_data rows and are never overwritten by set_data; to merge them into the base table, read them back and replace the table with set_data. Visitor rows have device and time only: they do not identify people and must not be read as intent. Filter by table or status; limit defaults to 100, at most 500. Pass since (the next_since from the last reply, a row_id, or an ISO time) to get only newer rows, oldest first. Act on a held row with set_data_row_status.