Delete row ('211', '20151') from daily_volatility

ticker_id 211
day 20151
implied_open 0.6381552162287792
implied_high 0.6778414858947481
implied_low 0.6048187497093654
implied_close 0.6175183560024754
historical_open 0.6953034445477744
historical_high 0.6953034445477744
historical_low 0.6953034445477744
historical_close 0.6953034445477744
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