Rates Engine v0.5.0-rc.44

[v0.5.0-rc.44] — 2026-05-11

Fixed

• Fiat market cap reads from PriceReader (Redis-triangulated FX),
  not GlobalPriceReader. rc.43 wired the fiat path through
  ComputeGlobalPrice → GlobalPriceReader, which only reads
  prices_1m. FX:FX rates (USD/CNY etc.) live in the Redis
  triangulated cache, not prices_1m — so the lookup returned no
  rows and CNY market_cap stayed empty post-rc.43. Hoist fiat
  handling above the globalPrice nil guard via populateFiatView,
  read FX rates directly through s.prices, and switch the
  verified-listing fan-out gate accordingly.
• Asset detail static-fallback recovery loop avoided. The
  client-side fallback that re-fetches /v1/coins/{slug} from
  the browser when a build-time fetch missed now auto-reloads
  once (tracked via sessionStorage) and surfaces a friendlier
  message on the second pass — no more endless flashes of the
  "couldn't be prerendered" panel.

Added

• /v1/chart for fiat:fiat pairs reads fx_quotes. When both
  base and quote are fiat (e.g. fiat:CNY/fiat:USD), the handler
  routes to the fx_quotes hypertable instead of the crypto
  prices_1m / prices_5m / prices_1h CAGGs. USD↔CCY both
  directions; cross-fiat (EUR/JPY etc.) returns an empty series
  pending a follow-up. Closes the "CNY 1y chart has no data"
  surface — once fx-history-backfill runs against a deployment,
  fiat charts get the full Frankfurter-backed history (back to
  1999-01-04).
• internal/sources/frankfurter — ECB rates client. Range
  endpoint returns every daily rate for every supported currency
  in one HTTP request, so a 25-year backfill is ~6 requests
  total (5-year chunks). No API key, no per-request cost.
• Explorer chart truncated banner. ChartPanel now surfaces
  the API's truncated / data_starts_at signal as an amber
  banner reading "Showing data from YYYY-MM-DD — the deployment
  hasn't accumulated the full Xy window yet." Replaces the
  silent "8 flat points for 1y" surface.
• Explorer chart quote picker drops XLM for fiat assets. When
  asset_id starts with fiat:, the chart panel forces USD
  quote and removes XLM from the picker (XLM isn't a meaningful
  quote against CNY / EUR / JPY).

Changed

• scripts/ops/fx-history-backfill defaults to Frankfurter. Drops
  the MASSIVE_API_KEY requirement for historical backfills. Live
  forex worker continues on Massive for hourly grain + broader
  ticker coverage; the one-shot tool now uses Frankfurter for the
  free "populate fx_quotes once" case. Runbook
  (docs/operations/runbooks/fx-history-missing.md) updated.