Delete row ('1571', '20490') from daily_volatility

ticker_id 1571
day 20490
implied_open 0.2190682085561481
implied_high 0.2206556593427869
implied_low 0.2047811514763993
implied_close 0.2063686022630381
historical_open 0.1523952755173204
historical_high 0.1523952755173204
historical_low 0.1523952755173204
historical_close 0.1523952755173204
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