Delete row ('2604', '20497') from daily_volatility

ticker_id 2604
day 20497
implied_open 0.2666917321553107
implied_high 0.2905034939548921
implied_low 0.2460548719290069
implied_close 0.265104281368672
historical_open 0.2555795766488395
historical_high 0.2555795766488395
historical_low 0.2555795766488395
historical_close 0.2555795766488395
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