feat: enrich article_history with tracing metadata + syntheses.job_id

CLAUDE.md

@@ -117,7 +117,7 @@ cd frontend && npx tsc --noEmit
 - `GET /api/v1/admin/users` — user list
 - `PUT /api/v1/admin/users/:id/role` — role management
 
-## Database (15 migrations)
+## Database (16 migrations)
 Tables: `users`, `sessions`, `magic_link_tokens`, `user_settings`, `sources`, `syntheses`, `admin_providers`, `admin_rate_limits`, `user_api_keys`, `audit_log`
 
 ## Environment Variables

backend/migrations/20260324000016_enrich_article_history.sql

@@ -0,0 +1,17 @@
+-- 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;