-- 自定义云主题(account.createTheme/uploadTheme 等)。themes = 用户创建的主题目录,
-- document_id 软引用 documents(无硬外键,避免与媒体表耦合;主题可能比 blob 长存,
-- getTheme 时若 blob 缺失则退化为无 document)。settings = []domain.ThemeSettingsSpec 的
-- JSONB(仅 accent 主题非空)。theme_user_installs = 每用户已安装/已存主题列表。
CREATE TABLE public.themes (
    id bigint NOT NULL,
    access_hash bigint DEFAULT 0 NOT NULL,
    creator_user_id bigint NOT NULL,
    slug text NOT NULL,
    title text DEFAULT ''::text NOT NULL,
    emoticon text DEFAULT ''::text NOT NULL,
    for_chat boolean DEFAULT false NOT NULL,
    document_id bigint DEFAULT 0 NOT NULL,
    settings jsonb DEFAULT '[]'::jsonb NOT NULL,
    installs_count integer DEFAULT 0 NOT NULL,
    created_at timestamp with time zone DEFAULT now() NOT NULL,
    CONSTRAINT themes_pkey PRIMARY KEY (id),
    CONSTRAINT themes_slug_key UNIQUE (slug),
    CONSTRAINT themes_creator_user_id_fkey FOREIGN KEY (creator_user_id)
        REFERENCES public.users(id) ON DELETE CASCADE
);

CREATE INDEX themes_creator_user_id_idx ON public.themes (creator_user_id);

CREATE TABLE public.theme_user_installs (
    user_id bigint NOT NULL,
    theme_id bigint NOT NULL,
    dark boolean DEFAULT false NOT NULL,
    installed_at timestamp with time zone DEFAULT now() NOT NULL,
    CONSTRAINT theme_user_installs_pkey PRIMARY KEY (user_id, theme_id),
    CONSTRAINT theme_user_installs_user_id_fkey FOREIGN KEY (user_id)
        REFERENCES public.users(id) ON DELETE CASCADE,
    CONSTRAINT theme_user_installs_theme_id_fkey FOREIGN KEY (theme_id)
        REFERENCES public.themes(id) ON DELETE CASCADE
);

CREATE INDEX theme_user_installs_user_id_idx ON public.theme_user_installs (user_id);