Function has_open_in_flight_dispatch 

pub fn has_open_in_flight_dispatch(
    conn: &Connection,
    document_id: &str,
    generation: u64,
) -> Result<bool>

#qflood: is a dispatch already in flight (accepted, not yet consumed) for this document at generation? Mirrors the open-dispatch shape the restart reconciler keys on. An open dispatch means the current turn already has work queued/running, so an auto re-fire would only pile a redundant trigger into the busy pane.