create table series (
  series_slug text primary key not null,
  title text not null,
  date_added date not null,
  min_year smallint not null,
  max_year smallint not null,
  description text,
  title_sort text not null
);

create table series_tags (
  series_slug text not null references series (series_slug),
  tag text not null,
  primary key (series_slug, tag)
);

create table episodes (
  series_slug text not null references series (series_slug),
  episode_slug text not null,
  title text not null,
  file_name text not null,
  file_size bigint not null,
  episode_length int not null,
  air_date text,
  primary key (series_slug, episode_slug)
);