Delete row ('2764', '20487') from daily_volatility

ticker_id 2764
day 20487
implied_open 0.161919980237153
implied_high 0.1714446849569855
implied_low 0.1460454723707654
implied_close 0.168269783383708
historical_open 0.1539827263039592
historical_high 0.1539827263039592
historical_low 0.1539827263039592
historical_close 0.1539827263039592
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