Initial daily news digest web

db/migrations/003_translation_fields.sql

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+-- Optional machine-translation fields. This does not enable AI analysis.
+-- Run after 002_users_and_subscriptions.sql.
+
+BEGIN;
+
+ALTER TABLE news_articles
+    ADD COLUMN IF NOT EXISTS language_code VARCHAR(16) NOT NULL DEFAULT 'zh',
+    ADD COLUMN IF NOT EXISTS translated_title TEXT,
+    ADD COLUMN IF NOT EXISTS translated_summary TEXT,
+    ADD COLUMN IF NOT EXISTS translation_status VARCHAR(20) NOT NULL DEFAULT 'not_needed',
+    ADD COLUMN IF NOT EXISTS translation_provider VARCHAR(80),
+    ADD COLUMN IF NOT EXISTS translated_at TIMESTAMPTZ;
+
+DO $$
+BEGIN
+    IF NOT EXISTS (
+        SELECT 1 FROM pg_constraint WHERE conname = 'news_articles_translation_status_check'
+    ) THEN
+        ALTER TABLE news_articles
+            ADD CONSTRAINT news_articles_translation_status_check
+            CHECK (translation_status IN ('not_needed', 'pending', 'translated', 'failed', 'skipped'));
+    END IF;
+END $$;
+
+CREATE INDEX IF NOT EXISTS idx_articles_translation_status
+    ON news_articles (translation_status, language_code);
+
+COMMIT;