Delete row ('615', '20571') from daily_volatility

ticker_id 615
day 20571
implied_open 0.2428799703557294
implied_high 0.2460548719290069
implied_low 0.2397050687824519
implied_close 0.2412925195690907
historical_open 0.1904940943966505
historical_high 0.1904940943966505
historical_low 0.1904940943966505
historical_close 0.1904940943966505
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