feat: real-time WebSocket streaming for prices and news#155
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Adds a FinnhubWebSocketAdapter that maintains a persistent WebSocket connection to Finnhub and dispatches trade and news messages to registered callbacks. Integrated into `qracer serve` so price alerts evaluate instantly on every tick instead of waiting for the next REST poll. - `StreamingProvider` protocol in `qracer/data/providers.py` - `FinnhubWebSocketAdapter` in `qracer/data/finnhub_ws.py` with deferred-subscription, graceful disconnect, and resilient dispatch - `AlertMonitor.evaluate_price(ticker, price)` for push-based evaluation - `Server` connects and wires the adapter at startup, subscribing to every ticker with an active alert, and falls back to REST polling on handshake failure - `qracer serve` builds the adapter from `providers.toml` + the `FINNHUB_API_KEY` credential when the `streaming` extra is installed - New `streaming` optional dependency (`websockets>=12.0`) - Tests: adapter init, connect/subscribe/dispatch, alert evaluate_price, server streaming lifecycle and callback wiring https://claude.ai/code/session_01YY9Dx62ZyhP5tV5XumdvPs
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Summary
StreamingProviderprotocol toqracer/data/providers.pywith callback-driven subscribe/unsubscribe APIFinnhubWebSocketAdapterinqracer/data/finnhub_ws.py-- persistent WebSocket connection towss://ws.finnhub.iowith deferred subscriptionsServerto evaluate alerts instantly on trade updatesAlertMonitor.evaluate_price()for single-ticker evaluation without a full sweepqracer serveCLI with graceful fallback to REST polling on connection failurewebsockets>=12.0under[streaming]extraCloses #132
Test plan
tests/data/test_finnhub_ws.py(init, callbacks, connect, subscribe, message dispatch)tests/test_alert_monitor.py(evaluate_pricemethod)tests/test_server.py(streaming lifecycle, price callback, notification)https://claude.ai/code/session_01GBX6TmhVqSUB3RXdt5JtcF