-- B10逐例复用只追加原来源，不复制任务、响应或费用账。
CREATE TABLE evaluation.muse_evaluation_reuse (
    unit_id uuid PRIMARY KEY REFERENCES evaluation.muse_evaluation_unit(unit_id),
    source_unit_id uuid NOT NULL REFERENCES evaluation.muse_evaluation_unit(unit_id),
    source_experiment_id uuid NOT NULL REFERENCES evaluation.muse_experiment(experiment_id),
    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 (unit_id <> source_unit_id)
);
CREATE INDEX evaluation_reuse_source ON evaluation.muse_evaluation_reuse(source_experiment_id);
CREATE TRIGGER evaluation_reuse_guard
BEFORE UPDATE OR DELETE ON evaluation.muse_evaluation_reuse
FOR EACH ROW EXECUTE FUNCTION public.muse_guard_literary_history();