USE WHEN you keep a local copy of the directory and need only what moved since your last sync, rather than re-fetching the whole catalog. Returns what changed since a given date — additions, per-resource change events, and retirements.

Returns (json): { since, until, window_days, counts:{added,changed,removed}, added:[...], changed:[{slug,name,url,events:[...]}], removed:[...], coverage:{...}, full_export }.

COVERAGE (also stated in the response): added is exact. updated is a field-level diff of every catalog field between the snapshot on baseline_date and the live record — complete at daily resolution, so a quiet copy edit IS caught; store baseline_date as your cursor. changed is the richer event log (score moves, releases, verification) and explains WHY. removed is approximate. Mirror from added + updated + removed. Read-only.

Examples:

• "what's new this week" -> { since: "2026-08-23" }

• "sync my copy" -> { since: }