Delete row ('602', '20647') from daily_volatility

ticker_id 602
day 20647
implied_open 0.769913631519796
implied_high 0.8175371551189585
implied_low 0.7413395173602982
implied_close 0.8111873519724035
historical_open 0.7381646157870208
historical_high 0.7381646157870208
historical_low 0.7381646157870208
historical_close 0.7381646157870208
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