Delete row ('211', '20706') from daily_volatility

ticker_id 211
day 20706
implied_open 0.6619669780283606
implied_high 0.7318148126404658
implied_low 0.6079936512826429
implied_close 0.6667293303882769
historical_open 0.8905598913043412
historical_high 0.8905598913043412
historical_low 0.8905598913043412
historical_close 0.8905598913043412
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