Delete row ('1481', '20180') from daily_volatility

ticker_id 1481
day 20180
implied_open 0.7635638283732409
implied_high 0.7857881393861835
implied_low 0.742926968146937
implied_close 0.7492767712934921
historical_open 0.7905504917460997
historical_high 0.7905504917460997
historical_low 0.7905504917460997
historical_close 0.7905504917460997
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