Delete row ('602', '20171') from daily_volatility

ticker_id 602
day 20171
implied_open 0.6365677654421404
implied_high 0.6635544288149993
implied_low 0.5476705213903703
implied_close 0.6079936512826429
historical_open 0.8175371551189585
historical_high 0.8175371551189585
historical_low 0.8175371551189585
historical_close 0.8175371551189585
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