Delete row ('1670', '20509') from daily_volatility

ticker_id 1670
day 20509
implied_open 0.8175371551189585
implied_high 0.8175371551189585
implied_low 0.7651512791598797
implied_close 0.7730885330930735
historical_open 0.8699230310780375
historical_high 0.8699230310780375
historical_low 0.8699230310780375
historical_close 0.8699230310780375
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