Adds FinnhubDataProvider as a drop-in replacement for ForexDataProvider.
Rate limit or API errors raise DataUnavailableError immediately — the
Telegram bot shows a clean per-TF error card rather than fake prices.
- data_provider_finnhub.py: Finnhub client, OANDA symbol mapping,
4h resampled from 60-min candles, shared module-level rate limiter
(60 calls/min free tier), full OHLCV validation copied from original
- signal_aggregator.py: import FinnhubDataProvider alias ForexDataProvider
- config.py: add finnhub_api_key field (FINNHUB_API_KEY env var overrides)
- telegram_bot.py: remove synthetic-data warning and _SUPPORTED_PAIRS;
unsupported pairs now show the engine's "data unavailable" card
- requirements.txt: add finnhub-python>=1.0
Set FINNHUB_API_KEY env var before running. main branch is untouched.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Harwinder