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Fix historical F&O UDiFF bhavcopy downloads for dates beyond current/… - #140
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…previous day bhavcopy_fo_raw() only tried the live daily-reports API (CurrentDay/PreviousDay window), silently falling back to the legacy DERIVATIVES route for older UDiFF-era dates, which NSE no longer serves. Add bhavcopy_fo_udiff_raw() to fetch from the permanent nsearchives.nseindia.com/content/fo archive first, mirroring the existing CM bhavcopy_udiff_raw() pattern. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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…previous day
bhavcopy_fo_raw() only tried the live daily-reports API (CurrentDay/PreviousDay window), silently falling back to the legacy DERIVATIVES route for older UDiFF-era dates, which NSE no longer serves. Add bhavcopy_fo_udiff_raw() to fetch from the permanent nsearchives.nseindia.com/content/fo archive first, mirroring the existing CM bhavcopy_udiff_raw() pattern.