create table users (
    id       integer primary key,
    username text not null unique,
    password text not null,
    is_admin boolean not null default false
);

create table tokens (
    id      integer primary key,
    user_id integer not null references users (id) on delete cascade,
    token   text not null unique
);

create table files (
    id           text    primary key, -- uuid
    user_id      integer not null references users (id) on delete cascade,
    filename     text not null,
    content_type text not null,
    hash         text not null,
    size         integer not null,
    created_at   integer not null,
    expires      integer,

    unique(filename, hash)
);