Delete row ('600', '20140') from daily_volatility

ticker_id 600
day 20140
implied_open 0.5571952261102028
implied_high 0.620693257575753
implied_low 0.5413207182438152
implied_close 0.6095811020692816
historical_open 0.8746853834379538
historical_high 0.8746853834379538
historical_low 0.8746853834379538
historical_close 0.8746853834379538
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