CREATE TABLE IF NOT EXISTS schema_migrations (
  version TEXT PRIMARY KEY,
  applied_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS articles (
  id BIGSERIAL PRIMARY KEY,
  external_id TEXT NOT NULL UNIQUE,
  slug TEXT NOT NULL UNIQUE,
  title TEXT NOT NULL,
  lead TEXT NOT NULL DEFAULT '',
  body TEXT NOT NULL,
  category_name TEXT NOT NULL,
  category_tag TEXT NOT NULL,
  producer_name TEXT NOT NULL,
  producer_tag TEXT NOT NULL,
  source_url TEXT,
  seo_title TEXT NOT NULL DEFAULT '',
  seo_description TEXT NOT NULL DEFAULT '',
  status TEXT NOT NULL DEFAULT 'draft' CHECK (status IN ('draft', 'published')),
  published_at TIMESTAMPTZ,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_articles_feed
  ON articles(status, published_at DESC, id DESC);
CREATE INDEX IF NOT EXISTS idx_articles_category
  ON articles(category_tag, status, published_at DESC);
CREATE INDEX IF NOT EXISTS idx_articles_producer
  ON articles(producer_tag, status, published_at DESC);

CREATE TABLE IF NOT EXISTS article_media (
  id BIGSERIAL PRIMARY KEY,
  article_id BIGINT NOT NULL REFERENCES articles(id) ON DELETE CASCADE,
  media_type TEXT NOT NULL CHECK (media_type IN ('image', 'video')),
  url TEXT NOT NULL,
  alt_text TEXT NOT NULL DEFAULT '',
  width INTEGER,
  height INTEGER,
  sort_order INTEGER NOT NULL DEFAULT 0,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_article_media_order
  ON article_media(article_id, sort_order, id);