Delete row ('1993', '20704') from daily_volatility

ticker_id 1993
day 20704
implied_open 0.742926968146937
implied_high 0.7937253933193773
implied_low 0.7191152063473557
implied_close 0.7810257870262672
historical_open 0.8397614661319012
historical_high 0.8397614661319012
historical_low 0.8397614661319012
historical_close 0.8397614661319012
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