Delete row ('1571', '20550') from daily_volatility

ticker_id 1571
day 20550
implied_open 0.2349427164225357
implied_high 0.2428799703557294
implied_low 0.2349427164225357
implied_close 0.2428799703557294
historical_open 0.174619586530263
historical_high 0.174619586530263
historical_low 0.174619586530263
historical_close 0.174619586530263
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