Delete row ('2305', '20257') from daily_volatility

ticker_id 2305
day 20257
implied_open 0.6699042319615544
implied_high 0.7000657969076907
implied_low 0.5952940449895329
implied_close 0.646092470161973
historical_open 0.847698720065095
historical_high 0.847698720065095
historical_low 0.847698720065095
historical_close 0.847698720065095
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