Delete row ('268', '20210') from daily_volatility

ticker_id 268
day 20210
implied_open 0.4635356296985163
implied_high 0.4635356296985163
implied_low 0.4444862202588513
implied_close 0.4476611218321287
historical_open 0.7540391236534084
historical_high 0.7540391236534084
historical_low 0.7540391236534084
historical_close 0.7540391236534084
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