Delete row ('331', '20717') from daily_volatility

ticker_id 331
day 20717
implied_open 0.7619763775866022
implied_high 0.7857881393861835
implied_low 0.7540391236534084
implied_close 0.7746759838797123
historical_open 0.8905598913043412
historical_high 0.8905598913043412
historical_low 0.8905598913043412
historical_close 0.8905598913043412
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