List language/task/config variants with audit and verification state.

Search a schema-verified variant. Config overrides cannot cross language boundaries; temporary audio URLs are explicitly marked ephemeral.

Return rows and schema for exactly one declared dataset configuration.

Return licence and citations, including parents of derivatives.

Return dated observed quality metrics separately from published figures. Missing observations remain null, never implicit zero.

Build a de-duplicated variant plan using published or dated audit metrics, with explicit quality, licence, benchmark and language-purity decisions.

Filter rows only when a versioned row-level audit manifest exists; aggregated audit totals alone produce a structured refusal.

Compare variant quality, provenance, licence and benchmark status.