Delete row ('4', '20686') from daily_volatility

ticker_id 4
day 20686
implied_open 0.4365489663256575
implied_high 0.439723867898935
implied_low 0.4174995568859924
implied_close 0.4317866139657412
historical_open 0.4809975883515426
historical_high 0.4809975883515426
historical_low 0.4809975883515426
historical_close 0.4809975883515426
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