Delete row ('1571', '20606') from daily_volatility

ticker_id 1571
day 20606
implied_open 0.2190682085561481
implied_high 0.2206556593427869
implied_low 0.2111309546229543
implied_close 0.2143058561962319
historical_open 0.1968438975432056
historical_high 0.1968438975432056
historical_low 0.1968438975432056
historical_close 0.1968438975432056
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