Delete row ('331', '20640') from daily_volatility

ticker_id 331
day 20640
implied_open 1.471566879214125
implied_high 1.557289221692618
implied_low 1.471566879214125
implied_close 1.489028837867152
historical_open 1.150901820313097
historical_high 1.150901820313097
historical_low 1.150901820313097
historical_close 1.150901820313097
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