-- S01只保存命令、审阅、决定与影响；业务实例表由各owner迁移定义。
CREATE TABLE public.muse_change_command (
    author_id text NOT NULL,
    run_purpose public.muse_purpose NOT NULL CHECK (run_purpose='production'),
    command_id text NOT NULL,
    request_hash text NOT NULL,
    receipt jsonb,
    created_at timestamptz NOT NULL DEFAULT clock_timestamp(),
    PRIMARY KEY(author_id,run_purpose,command_id)
);
CREATE TABLE public.muse_author_review (
    review_id uuid PRIMARY KEY,
    author_id text NOT NULL,
    entry_id text NOT NULL,
    target_ref text NOT NULL,
    content_hash text NOT NULL,
    snapshot jsonb NOT NULL,
    created_at timestamptz NOT NULL DEFAULT clock_timestamp()
);
CREATE TABLE public.muse_candidate_decision (
    candidate_id text NOT NULL,
    candidate_revision bigint NOT NULL,
    decision text NOT NULL CHECK (decision IN ('adopt','reject','defer')),
    author_id text NOT NULL,
    review_id uuid NOT NULL REFERENCES public.muse_author_review(review_id),
    command_id text NOT NULL,
    PRIMARY KEY(candidate_id,candidate_revision)
);
CREATE TABLE public.muse_change_impact (
    impact_id uuid PRIMARY KEY,
    receipt_id uuid NOT NULL,
    target_ref text NOT NULL,
    reason text NOT NULL,
    before_version text NOT NULL,
    after_version text NOT NULL,
    state text NOT NULL DEFAULT 'pending' CHECK (state IN ('pending','handled')),
    UNIQUE(receipt_id,target_ref,reason)
);