Delete row ('615', '20593') from daily_volatility

ticker_id 615
day 20593
implied_open 0.2555795766488395
implied_high 0.2587544782221169
implied_low 0.2508172242889232
implied_close 0.2555795766488395
historical_open 0.1936689959699281
historical_high 0.1936689959699281
historical_low 0.1936689959699281
historical_close 0.1936689959699281
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