Function serve_pause_resume_all 

pub fn serve_pause_resume_all(
    connection: &mut PgConnection,
    owner: &str,
    pause: bool,
) -> Result<usize, Status>

Pause or resume all conversions globally — the dashboard’s “Pause/Resume all conversions”. The global twin of serve_pause_resume: across every (corpus, service), pause blocks every in-progress task and resume returns every Blocked task to TODO. Returns the number of tasks moved. Audited by the fairing; fully reversible (the inverse action restores TODO).