Claude/2 plus 2 calculation xhqecf - #166
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Consolidates MARKET_INTERFACE.md, MARKET_SIMULATOR.md and MASSIVE_API.md into a
single implementation-ready design for backend/app/market/, with drop-in code
for every module:
- Shared models: open_price baseline, tick_direction vs change_percent_today,
PricePoint/SourceStatus, ISO 8601 wire conversion
- PriceCache with a sticky open_price anchor
- MarketDataSource + describe() and get_history()
- Capability probe classifying the five Massive key states
- Async, capability-driven source factory (three sources, one interface)
- Simulator: decaying shocks at 1e-4, deterministic unknown-ticker seeds,
seed_overrides, LinAlgError fallback, history ring buffer with prefill
- AnchoredSimulatorDataSource: real closes from one free-tier call, GBM motion
- Rewritten Massive client: nanosecond timestamps, prev_day.close baseline,
error classification, poll-loop backoff, poll/quote staleness
- SSE heartbeat, /api/prices/{ticker}/history, /api/health, lifespan wiring
- Test plan, implementation order, and the PLAN.md items this closes
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015iKouPXUXK3RAgWvfrkGPv
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