-- 模型修订只追加结果与来源；正文候选仍由B05拥有。
CREATE TABLE public.muse_revision_result (
    task_id uuid PRIMARY KEY REFERENCES public.muse_task(task_id),
    author_id text NOT NULL,
    attempt_id uuid NOT NULL REFERENCES public.muse_attempt(attempt_id),
    call_id text NOT NULL,
    diagnosis_id uuid NOT NULL REFERENCES public.muse_diagnosis(diagnosis_id),
    candidate_id uuid REFERENCES public.muse_writing_candidate(candidate_id),
    outcome text NOT NULL CHECK (outcome IN ('candidate','original','rejected')),
    payload jsonb NOT NULL CHECK (jsonb_typeof(payload) = 'object'),
    payload_hash text NOT NULL CHECK (payload_hash ~ '^[0-9a-f]{64}$'),
    created_at timestamptz NOT NULL DEFAULT clock_timestamp(),
    CHECK ((outcome='candidate') = (candidate_id IS NOT NULL))
);
CREATE TRIGGER muse_revision_result_guard BEFORE UPDATE OR DELETE ON public.muse_revision_result
FOR EACH ROW EXECUTE FUNCTION public.muse_guard_literary_history();