Delete row ('268', '20217') from daily_volatility

ticker_id 268
day 20217
implied_open 0.5286211119507053
implied_high 0.5286211119507053
implied_low 0.5111591532976789
implied_close 0.5111591532976789
historical_open 0.7540391236534084
historical_high 0.7540391236534084
historical_low 0.7540391236534084
historical_close 0.7540391236534084
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