Delete row ('9', '20501') from daily_volatility

ticker_id 9
day 20501
implied_open 0.2730415353018658
implied_high 0.2889160431682533
implied_low 0.2603419290087557
implied_close 0.2619293797953945
historical_open 0.2587544782221169
historical_high 0.2587544782221169
historical_low 0.2587544782221169
historical_close 0.2587544782221169
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