Delete row ('2756', '20150') from daily_volatility

ticker_id 2756
day 20150
implied_open 0.161919980237153
implied_high 0.1968438975432056
implied_low 0.1587450786638754
implied_close 0.1952564467565668
historical_open 0.1508078247306817
historical_high 0.1508078247306817
historical_low 0.1508078247306817
historical_close 0.1508078247306817
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