create table madou_video_info
(
    id        bigserial primary key not null,
    title     varchar(255)          not null,
    classify  varchar(255)          not null,
    cover_url varchar(255),
    m3u8_url  varchar(255)
);
create table classify_info
(
    id        bigserial primary key not null,
    name      varchar(255)          not null,
    url       varchar(255)          not null,
    page_size int                   not null
);
select sum(page_size) * 18 / 1024 / 2 from classify_info;