Delete row ('2687', '20207') from daily_volatility

ticker_id 2687
day 20207
implied_open 0.542908169030454
implied_high 0.5476705213903703
implied_low 0.523858759590789
implied_close 0.5349709150972602
historical_open 0.7540391236534084
historical_high 0.7540391236534084
historical_low 0.7540391236534084
historical_close 0.7540391236534084
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