Claude 88e4d48000 feat: BTC/ETH/XAG support and Vol Lab (live Deribit SVI surface, vol cone, VRP) ...

Volatile instruments
- Add XAGUSD (SI=F, silver lease rate as r_f), BTCUSD and ETHUSD end to end:
  pair metadata, live rates/OHLC/signals, CFTC positioning mappings
- Asset-class calendars: crypto annualised on 365 days, FX/metals on 252,
  threaded through the signal engine
- Pair switch loads a typical ATM vol, rescales legs by moneyness, and
  strategy templates use a ~1%-of-spot strike step

Vol Lab tab
- /api/vol/crypto/{BTC,ETH}: Deribit book summaries -> raw SVI fit per
  expiry with Durrleman butterfly-arbitrage check, ATM / 25d RR / 25d BF
  (Black-76 forward delta), DVOL, 30d constant-maturity IV, realised vol
  and vol risk premium; cached 60s, 503 when Deribit is unreachable
- /api/vol/cone/{pair}: Burghardt-Lane realised-vol cone on the asset's
  calendar
- UI: KPIs, cone with implied term-structure overlay, per-expiry smile
  (market vs SVI), term-structure table with 'Use' to load T/sigma/RR/BF
  into pricing and the Vol Smile tab

Fixes in the signal engine
- OU half-life divided by 252 twice; stationary sd used sqrt(252k) not sqrt(2k)
- Fallback realised vol returned decimals under *_pct keys

Tests: backend/tests (pytest) validate SVI recovery, exact 25d strikes,
cone calibration on both calendars and the endpoints with mocked feeds.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FpiqUMAyo4RL5DdQHMWbwE

2026-09-29 05:17:14 +00:00

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