Delete row ('9', '20168') from daily_volatility

ticker_id 9
day 20168
implied_open 0.2730415353018658
implied_high 0.2857411415949758
implied_low 0.2587544782221169
implied_close 0.2603419290087557
historical_open 0.2889160431682533
historical_high 0.2889160431682533
historical_low 0.2889160431682533
historical_close 0.2889160431682533
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