create table course_categories (
  id uuid primary key default gen_random_uuid(),
  name text not null unique,
  position integer not null default 0,
  is_active boolean not null default true,
  created_at timestamptz not null default now(),
  updated_at timestamptz not null default now(),
  constraint course_categories_name_check check (char_length(trim(name)) between 1 and 120)
);

insert into course_categories (name, position)
select category, row_number() over (order by category)
from (select distinct category from courses) categories
on conflict (name) do nothing;

insert into course_categories (name, position)
values
  ('Tráfego Pago & Meta Ads', 10),
  ('Google Ads & YouTube', 20),
  ('Funis de Vendas & ROI', 30),
  ('Copywriting & Criativos', 40),
  ('Gestão & Processos de Agência', 50)
on conflict (name) do nothing;

create table platform_settings (
  key text primary key,
  value jsonb not null,
  updated_at timestamptz not null default now(),
  updated_by uuid references users(id) on delete set null
);

insert into platform_settings (key, value)
values
  ('home.featuredCourseId', 'null'::jsonb),
  ('home.courseOrder', '[]'::jsonb),
  ('media.defaultCoverImageUrl', 'null'::jsonb)
on conflict (key) do nothing;

create table auth_rate_limits (
  key text primary key,
  window_started_at timestamptz not null,
  attempts integer not null default 0 check (attempts >= 0),
  updated_at timestamptz not null default now()
);

create index auth_rate_limits_updated_at_index on auth_rate_limits (updated_at);
create trigger course_categories_set_updated_at before update on course_categories for each row execute function set_updated_at();