Rates Engine v0.5.0-rc.71

[v0.5.0-rc.71] — 2026-05-22

Fixed

• /v1/assets/{id} cold-path latency (#63). A cache-miss
  asset-detail request was 570ms–2.3s. Three mechanisms, all fixed:
  • The F2 overlay (applyF2Fields) ran its four DB-bound reads —
    24h volume, 24h change, USD price, supply snapshot —
    serially, so a cold request paid their sum. They touch
    disjoint AssetDetail fields and are now fanned out
    concurrently; the wall-clock cost collapses to the slowest
    single read.
  • The SEP-1 stellar.toml overlay cache (cachekeys.TOMLTTL)
    expired every 15 minutes, so a cold request whose issuer
    domain had aged out blocked up to 500ms on a fresh upstream
    HTTPS fetch on the request path. stellar.toml is
    slow-changing issuer reference data — TTL raised to 24h, so
    that fetch is paid ~once per domain per day rather than per
    15-minute window.
  • The API's selfPrewarmAssetEndpoints goroutine HTTP-GETs its
    own /v1/assets/{id} endpoints to warm caches; those requests
    are deliberately cold and were counted in the customer-facing
    latency histogram, dominating p95/p99. They now carry a
    ratesengine-prewarm/ User-Agent and are excluded from the SLO
    histogram alongside the existing smoke + probe synthetic
    traffic.