c50843933f
New service: real-time market data collection with unified event model. Architecture: - Domain events: TradeEvent, QuoteEvent, BookL2Event, HeartbeatEvent - Provider interface: MarketDataProvider ABC with connect/subscribe/stream/close - Async EventBus with fan-out to multiple consumers Providers: - BinanceProvider: public WebSocket (trades + bookTicker), no API key needed, auto-reconnect with exponential backoff, heartbeat timeout detection - AlpacaProvider: IEX real-time data + paper trading auth, dry-run mode when no keys configured (heartbeats only) Consumers: - StorageConsumer: SQLite (via SQLAlchemy async) + JSONL append-only log - MetricsConsumer: Prometheus counters, latency histograms, events/sec gauge - PrintConsumer: sampled structured logging (1/100 events) CLI: python -m app run --provider binance --symbols BTCUSDT,ETHUSDT HTTP: /health, /metrics (Prometheus), /latest?symbol=XXX Tests: 19/19 passed (Binance parse, Alpaca parse, bus smoke tests) Config: pydantic-settings + .env, all secrets via environment variables. Co-authored-by: Cursor <cursoragent@cursor.com>