Delete row ('21', '20726') from daily_volatility

ticker_id 21
day 20726
implied_open 0.3222525096876671
implied_high 0.3333646651941384
implied_low 0.3190776081143896
implied_close 0.3238399604743059
historical_open 0.2365301672091744
historical_high 0.2365301672091744
historical_low 0.2365301672091744
historical_close 0.2365301672091744
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