Delete row ('1517', '20733') from daily_volatility

ticker_id 1517
day 20733
implied_open 0.89214734209098
implied_high 0.9969190940091377
implied_low 0.8508736216383724
implied_close 0.8810351865845087
historical_open 0.542908169030454
historical_high 0.542908169030454
historical_low 0.542908169030454
historical_close 0.542908169030454
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