Collection enrichment uses the existing backend GET /cards?ids= route in batches of at most 100, instead of a separate request per owned card. Missing catalogue records leave ownership visible. Set names still come from the localized set list, because the batch card response does not carry them.

The VPS showed a concentrated 429 burst on card-detail routes. This fix reduces client request pressure, but does not establish the burst's source or replace server-side protection and monitoring.