BEGIN;

-- Workers normally transition queued/running jobs to succeeded, but recovery
-- and import paths may insert an already-succeeded job or attach history_id
-- after the provider result was committed. Every server-owned completion edge
-- must enqueue the same immutable event exactly once.
CREATE OR REPLACE FUNCTION public.enqueue_processing_job_push()
RETURNS trigger
LANGUAGE plpgsql
SECURITY DEFINER
SET search_path = ''
AS $$
BEGIN
  IF NEW.kind <> 'transcription'
     OR NEW.status <> 'succeeded'
     OR NEW.history_id IS NULL THEN
    RETURN NEW;
  END IF;

  IF TG_OP = 'UPDATE'
     AND OLD.status IS NOT DISTINCT FROM 'succeeded'
     AND OLD.history_id IS NOT DISTINCT FROM NEW.history_id THEN
    RETURN NEW;
  END IF;

  IF EXISTS (
    SELECT 1
    FROM public.history
    WHERE id = NEW.history_id
      AND user_id = NEW.user_id
      AND status = 'completed'
  ) THEN
    PERFORM public.enqueue_immutable_push_event(
      'transcription.completed', NEW.history_id
    );
  END IF;
  RETURN NEW;
END;
$$;

DROP TRIGGER enqueue_processing_job_push_after_success
  ON public.processing_jobs;
CREATE TRIGGER enqueue_processing_job_push_after_success
  AFTER INSERT OR UPDATE OF status, history_id ON public.processing_jobs
  FOR EACH ROW EXECUTE FUNCTION public.enqueue_processing_job_push();

REVOKE ALL ON FUNCTION public.enqueue_processing_job_push()
  FROM PUBLIC, anon, authenticated;

COMMIT;