Delete row ('211', '20150') from daily_volatility

ticker_id 211
day 20150
implied_open 0.5714822831899515
implied_high 0.6953034445477744
implied_low 0.5508454229636478
implied_close 0.5857693402697004
historical_open 0.6921285429744969
historical_high 0.6921285429744969
historical_low 0.6921285429744969
historical_close 0.6921285429744969
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