Delete row ('1992', '20657') from daily_volatility

ticker_id 1992
day 20657
implied_open 0.6857787398279419
implied_high 0.6953034445477744
implied_low 0.6302179622955855
implied_close 0.6730791335348318
historical_open 0.5698948324033128
historical_high 0.5698948324033128
historical_low 0.5698948324033128
historical_close 0.5698948324033128
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