Delete row ('2631', '20615') from daily_volatility

ticker_id 2631
day 20615
implied_open 0.9635826274897239
implied_high 1.14772691873982
implied_low 0.8937347928776188
implied_close 0.9032594975974513
historical_open 1.0445426176083
historical_high 1.0445426176083
historical_low 1.0445426176083
historical_close 1.0445426176083
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