Delete row ('602', '20306') from daily_volatility

ticker_id 602
day 20306
implied_open 0.5762446355498678
implied_high 0.5762446355498678
implied_low 0.5397332674571765
implied_close 0.549257972177009
historical_open 0.6873661906145806
historical_high 0.6873661906145806
historical_low 0.6873661906145806
historical_close 0.6873661906145806
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