# Drug source registry cache

`drug_source_registry_cache` · Provenance · status live

Drug-side mirror of medicare_source_registry_cache. source_publication_date generalizes cms_publication_date (FDA / DOL / NLM / HRSA / SEC / state DOIs).

**Grain.** One row per (source_id, observed_period, s3_object).

Query it: `query_substrate` with `SELECT ... FROM drug_source_registry_cache WHERE ... LIMIT 100`; read `describe_data_source("drug_source_registry_cache")` first.