Get Daily Snapshot By Date

Retrieve an archived daily snapshot for date (YYYY-MM-DD UTC).

Returns the full snapshot identical in shape to /api/v1/daily, including the new onchain_health_score field. Use this to build historical regime-tagged backtests without re-computing per-day signals yourself.

A snapshot for today is not written until the 20:00 UTC daily build (it is keyed by build date, so day D lands at 20:00 UTC on D — NOT 01:00 UTC, which is the separate backtesting Parquet export). Those 404s carry Retry-After (seconds until that build) so a polling client backs off instead of hot- looping; one consumer was observed retrying today's date ~1900 times in 2h.