Preparar repositorio para despliegue: código fuente limpio

migrations/add_traceability_cols.sql

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+-- Add fuente_url_id to feeds table for traceability
+ALTER TABLE feeds 
+ADD COLUMN IF NOT EXISTS fuente_url_id INTEGER REFERENCES fuentes_url(id) ON DELETE SET NULL;
+
+CREATE INDEX IF NOT EXISTS idx_feeds_fuente_url ON feeds(fuente_url_id);
+
+COMMENT ON COLUMN feeds.fuente_url_id IS 'ID of the URL source that discovered this feed';