-- Create normalized article table for blog-backup.
-- One row = one article. digest_date groups rows by daily digest.

CREATE TABLE IF NOT EXISTS public.blog_articles (
  id TEXT PRIMARY KEY,
  title TEXT NOT NULL,
  summary TEXT NOT NULL,
  source_url TEXT,
  digest_date DATE,
  published_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  tags TEXT[] NOT NULL DEFAULT '{}'::TEXT[],
  audio_url TEXT,
  audio_duration INTEGER,
  is_published BOOLEAN NOT NULL DEFAULT TRUE,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_blog_articles_published_at
  ON public.blog_articles (published_at DESC);

CREATE INDEX IF NOT EXISTS idx_blog_articles_digest_date
  ON public.blog_articles (digest_date DESC);

CREATE INDEX IF NOT EXISTS idx_blog_articles_tags
  ON public.blog_articles USING GIN (tags);

CREATE INDEX IF NOT EXISTS idx_blog_articles_audio
  ON public.blog_articles (audio_url)
  WHERE audio_url IS NOT NULL;

COMMENT ON TABLE public.blog_articles IS
  'One row per article. digest_date groups rows into a daily digest.';

COMMENT ON COLUMN public.blog_articles.summary IS
  'Structured article summary body shown in UI and RSS.';

COMMENT ON COLUMN public.blog_articles.digest_date IS
  'Logical daily digest date (YYYY-MM-DD). Multiple articles can share one date.';

COMMENT ON COLUMN public.blog_articles.is_published IS
  'Controls public visibility in /api/articles and RSS.';