-- B02本书实例、不可变事实版本与提案；作者决定仍由S01保存。
CREATE TABLE public.muse_world_clock (
    work_id text PRIMARY KEY REFERENCES public.muse_work(work_id),
    system_revision bigint NOT NULL CHECK(system_revision>=0)
);
CREATE TABLE public.muse_world_object (
    object_id text PRIMARY KEY,
    work_id text NOT NULL REFERENCES public.muse_work(work_id),
    type_id text NOT NULL,
    instance_family text NOT NULL CHECK(instance_family IN ('entity','relation')),
    current_revision bigint NOT NULL CHECK(current_revision>0)
);
CREATE TABLE public.muse_world_version (
    object_id text NOT NULL REFERENCES public.muse_world_object(object_id),
    revision bigint NOT NULL CHECK(revision>0),
    system_revision bigint NOT NULL CHECK(system_revision>0),
    content jsonb NOT NULL,
    content_hash text NOT NULL,
    schema_binding jsonb NOT NULL,
    sources jsonb NOT NULL,
    independent boolean NOT NULL,
    effective_from text REFERENCES public.muse_chapter(chapter_id),
    knowledge_mode text NOT NULL CHECK(knowledge_mode IN ('fact','belief','plan','setting')),
    known_to jsonb NOT NULL,
    reader_visible boolean NOT NULL,
    planned_window jsonb,
    author_id text NOT NULL,
    created_at timestamptz NOT NULL DEFAULT clock_timestamp(),
    PRIMARY KEY(object_id,revision)
);
ALTER TABLE public.muse_world_object ADD CONSTRAINT world_current_version_fk
    FOREIGN KEY(object_id,current_revision) REFERENCES public.muse_world_version(object_id,revision)
    DEFERRABLE INITIALLY DEFERRED;
CREATE TABLE public.muse_fact_proposal (
    proposal_id uuid PRIMARY KEY,
    work_id text NOT NULL REFERENCES public.muse_work(work_id),
    object_id text NOT NULL,
    current_revision bigint NOT NULL CHECK(current_revision>0)
);
CREATE TABLE public.muse_fact_proposal_version (
    proposal_id uuid NOT NULL REFERENCES public.muse_fact_proposal(proposal_id),
    revision bigint NOT NULL CHECK(revision>0),
    request jsonb NOT NULL,
    proposed_content jsonb NOT NULL,
    proposal_hash text NOT NULL,
    created_at timestamptz NOT NULL DEFAULT clock_timestamp(),
    PRIMARY KEY(proposal_id,revision)
);
ALTER TABLE public.muse_fact_proposal ADD CONSTRAINT fact_proposal_current_version_fk
    FOREIGN KEY(proposal_id,current_revision) REFERENCES public.muse_fact_proposal_version(proposal_id,revision)
    DEFERRABLE INITIALLY DEFERRED;
CREATE INDEX world_version_system_idx ON public.muse_world_version(object_id,system_revision DESC);