Delete row ('9', '20257') from daily_volatility

ticker_id 9
day 20257
implied_open 0.2762164368751432
implied_high 0.2762164368751432
implied_low 0.2555795766488395
implied_close 0.2603419290087557
historical_open 0.3159027065411121
historical_high 0.3159027065411121
historical_low 0.3159027065411121
historical_close 0.3159027065411121
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