-- Enrich article_history with tracing metadata
ALTER TABLE article_history ADD COLUMN title TEXT NOT NULL DEFAULT '';
ALTER TABLE article_history ADD COLUMN source_type TEXT NOT NULL DEFAULT 'unknown';
ALTER TABLE article_history ADD COLUMN source_url TEXT;
ALTER TABLE article_history ADD COLUMN category TEXT;
ALTER TABLE article_history ADD COLUMN synthesis_id UUID REFERENCES syntheses(id) ON DELETE SET NULL;
ALTER TABLE article_history ADD COLUMN status TEXT NOT NULL DEFAULT 'used';
ALTER TABLE article_history ADD COLUMN scraped_ok BOOLEAN NOT NULL DEFAULT true;
ALTER TABLE article_history ADD COLUMN job_id UUID NOT NULL DEFAULT gen_random_uuid();

-- Drop unique index — table is now a trace log
DROP INDEX idx_article_history_user_url;
CREATE INDEX idx_article_history_user_url ON article_history(user_id, url_hash);
CREATE INDEX idx_article_history_job_id ON article_history(job_id);

-- Store job_id on syntheses for direct provenance lookup
ALTER TABLE syntheses ADD COLUMN job_id UUID;