Delete row ('1993', '20700') from daily_volatility

ticker_id 1993
day 20700
implied_open 0.7254650094939107
implied_high 0.7318148126404658
implied_low 0.6889536414012194
implied_close 0.6984783461210519
historical_open 0.8397614661319012
historical_high 0.8397614661319012
historical_low 0.8397614661319012
historical_close 0.8397614661319012
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