Delete row ('2421', '20731') from daily_volatility

ticker_id 2421
day 20731
implied_open 0.4222619092459087
implied_high 0.4222619092459087
implied_low 0.3254274112609447
implied_close 0.3571764269937197
historical_open 0.2016062499031218
historical_high 0.2016062499031218
historical_low 0.2016062499031218
historical_close 0.2016062499031218
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