Delete row ('1961', '20179') from daily_volatility

ticker_id 1961
day 20179
implied_open 0.2095435038363156
implied_high 0.2095435038363156
implied_low 0.1952564467565668
implied_close 0.2047811514763993
historical_open 0.2127184054095931
historical_high 0.2127184054095931
historical_low 0.2127184054095931
historical_close 0.2127184054095931
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