tengu_v3_features_catalogue

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FEATURE-STORE CATALOGUE — the derived research panels this platform computes for its own models: what exists, how much of it there is, how far back it goes, and how fresh it actually is. Every entry carries MEASURED coverage (rows, symbols, distinct observation dates, history window) and a measured freshness block. freshness.status is `current` when the producer is inside twice its own declared cadence, or `archival` when the producer has stopped but the dataset is a genuine historical panel — an archival dataset is still readable and EVERY read of it says so. A second, independent flag, stale_for_its_own_cadence, fires when the newest observation is old relative to the table's own typical gap: it catches a panel rewritten nightly whose data still ends months ago because the upstream licence lags. Datasets whose producer stopped and which are NOT panels are listed under `withheld` with the measurement that disqualified them and have NO route at all; `excluded` lists live datasets deliberately not sold here, with the reason. Live-measured 2026-08-02: 19 servable datasets totalling 17,062,613 rows — 14 current, 5 archival (spanning 1962, 1970, 2000, 2025-05 and 2026-05 forward) — plus 5 withheld and 2 excluded. Call it first: it is the only place the slugs for /api/v3/features/{dataset} are published.