Delete row ('600', '20481') from daily_volatility

ticker_id 600
day 20481
implied_open 0.9143716531039225
implied_high 0.9334210625435876
implied_low 0.9000845960241738
implied_close 0.9032594975974513
historical_open 0.7064156000542456
historical_high 0.7064156000542456
historical_low 0.7064156000542456
historical_close 0.7064156000542456
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