Delete row ('777', '20731') from daily_volatility

ticker_id 777
day 20731
implied_open 0.4032124998062436
implied_high 0.4159121060993537
implied_low 0.4016250490196049
implied_close 0.4079748521661599
historical_open 0.3222525096876671
historical_high 0.3222525096876671
historical_low 0.3222525096876671
historical_close 0.3222525096876671
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