Delete row ('331', '20711') from daily_volatility

ticker_id 331
day 20711
implied_open 0.776263434666351
implied_high 0.8048375488258486
implied_low 0.776263434666351
implied_close 0.788963040959461
historical_open 0.9524704719832526
historical_high 0.9524704719832526
historical_low 0.9524704719832526
historical_close 0.9524704719832526
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