Delete row ('9', '20515') from daily_volatility

ticker_id 9
day 20515
implied_open 0.2698666337285883
implied_high 0.3063780018212796
implied_low 0.2698666337285883
implied_close 0.2762164368751432
historical_open 0.271454084515227
historical_high 0.271454084515227
historical_low 0.271454084515227
historical_close 0.271454084515227
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