Delete row ('8', '20731') from daily_volatility

ticker_id 8
day 20731
implied_open 0.5651324800433966
implied_high 0.5873567910563391
implied_low 0.5635450292567578
implied_close 0.568307381616674
historical_open 0.3952752458730499
historical_high 0.3952752458730499
historical_low 0.3952752458730499
historical_close 0.3952752458730499
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