Delete row ('189', '20711') from daily_volatility

ticker_id 189
day 20711
implied_open 0.8873849897310637
implied_high 0.9254838086103938
implied_low 0.788963040959461
implied_close 0.885797538944425
historical_open 0.7667387299465185
historical_high 0.7667387299465185
historical_low 0.7667387299465185
historical_close 0.7667387299465185
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