Delete row ('2491', '20171') from daily_volatility

ticker_id 2491
day 20171
implied_open 0.6079936512826429
implied_high 0.6079936512826429
implied_low 0.5794195371231453
implied_close 0.5810069879097841
historical_open 0.7016532476943295
historical_high 0.7016532476943295
historical_low 0.7016532476943295
historical_close 0.7016532476943295
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