Delete row ('1956', '20720') from daily_volatility

ticker_id 1956
day 20720
implied_open 0.2143058561962319
implied_high 0.2270054624893419
implied_low 0.1968438975432056
implied_close 0.2206556593427869
historical_open 0.2206556593427869
historical_high 0.2206556593427869
historical_low 0.2206556593427869
historical_close 0.2206556593427869
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