Delete row ('9', '20517') from daily_volatility

ticker_id 9
day 20517
implied_open 0.271454084515227
implied_high 0.2920909447415308
implied_low 0.2682791829419495
implied_close 0.277803887661782
historical_open 0.2555795766488395
historical_high 0.2555795766488395
historical_low 0.2555795766488395
historical_close 0.2555795766488395
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