b124d0a7a3b5b696b98da87f129d538d3cbe6b37
OANDA forex candles require a paid plan — free-tier keys get 403. - Add FINNHUB_FOREX_EXCHANGE env var (default OANDA) so the exchange prefix can be changed without touching code - Handle 403 specifically: clear error message tells the user which exchange failed and how to discover what their key can access - Add discover_exchanges() method wrapping forex_exchanges() API call so the right prefix can be found before configuring the bot Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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