Delete row ('1571', '20207') from daily_volatility

ticker_id 1571
day 20207
implied_open 0.2428799703557294
implied_high 0.2508172242889232
implied_low 0.2365301672091744
implied_close 0.2381176179958132
historical_open 0.2587544782221169
historical_high 0.2587544782221169
historical_low 0.2587544782221169
historical_close 0.2587544782221169
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