Rates Engine v0.5.0-rc.16

[v0.5.0-rc.16] — 2026-05-06

Fixed

• /v1/coins/XLM now returns native XLM, not the scam token.
  Previously XLM matched whichever issued token's code happened
  to be "XLM" wins the disambiguation tiebreak (today: a token
  issued by GAE5PQNUIP5E…). Native XLM has no row in
  classic_assets by definition, so a special-case
  GetNativeCoinRow builds a synthetic row from the same
  xlm_usd* CTEs that drive triangulated pricing for every
  other asset. Slug "XLM" and "native" both route here.
  Explorer now pre-renders /assets/XLM unconditionally.
• XLM (asset_id native) now returns a non-null price_usd,
  change_1h_pct, change_24h_pct, change_7d_pct, and
  price_history_24h on /v1/coins. Previously all five were
  null because the SQL CTEs filter on (base_asset, quote_asset) = ('native', 'fiat:USD') for direct USD and ('native', 'native') for XLM-relative — neither has rows in prices_1m.
  XLM is now special-cased to use the xlm_usd* CTEs (Circle
  USDC / Tether USDT proxy) directly. Other assets are
  unaffected; the existing direct-then-triangulate chain still
  takes precedence when those buckets exist.

Added

• /v1/coins listing prepends native XLM on the first
  unfiltered page. Native is the most-active asset on the
  network but has no classic_assets row, so the listing
  silently omits it — meaning the explorer's home Top assets
  / Top movers panels never include XLM. The handler now fires
  GetNativeCoinRow alongside the listing query when
  (cursor, issuer, q) are all empty and limit ≥ 2, prepends
  the synthetic row, and trims the listing to limit-1 so the
  page size stays exactly limit. Cursor for page 2 is
  computed from the last listing row, never from native — so
  pagination resumes correctly past the synthetic injection.
• Status page: real per-endpoint probes. The Endpoints
  matrix on status.ratesengine.net now fires a parallel probe
  against every public endpoint on each 30-second poll (with
  safe minimum parameters — ?asset=native, ?limit=1, etc.)
  and renders a green/amber/red badge with measured latency.
  Endpoints that need auth or are SSE streams keep a static
  "auth req'd" / "stream" tag. Replaces the previous
  single-/v1/healthz probe that left every other row stuck on
  "—".
• /v1/coins/{slug}.markets_count — count of distinct
  (base_asset, quote_asset) pairs the asset participated in
  over the trailing 24h. Listing endpoint omits it (count-distinct
  per row would dominate the query cost for 100 rows). Asset
  detail page renders it as a fourth stat in the price card.
• /v1/coins[*].change_1h_pct + change_7d_pct — trailing
  1-hour and 7-day price change windows alongside the existing
  change_24h_pct. Same direct-or-XLM-triangulated formula;
  null when no current price or no past-bucket snapshot exists
  in prices_1m within the window-specific tolerance (±5min for
  1h, ±30min for 24h, ±2h for 7d). Asset-detail page renders all
  three side-by-side as colour-coded pills.

Changed

• internal/storage/timescale.scanCoinRow extracted as the shared
  row-projection between ListCoinsExt and GetCoinBySlug. Same
  external behaviour; reduces duplication as the wire shape grows.