Delete row ('2756', '20621') from daily_volatility

ticker_id 2756
day 20621
implied_open 0.2016062499031218
implied_high 0.2095435038363156
implied_low 0.1825568404634567
implied_close 0.2016062499031218
historical_open 0.1904940943966505
historical_high 0.1904940943966505
historical_low 0.1904940943966505
historical_close 0.1904940943966505
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