Delete row ('1518', '20731') from daily_volatility

ticker_id 1518
day 20731
implied_open 0.2079560530496768
implied_high 0.2206556593427869
implied_low 0.1968438975432056
implied_close 0.2047811514763993
historical_open 0.1889066436100118
historical_high 0.1889066436100118
historical_low 0.1889066436100118
historical_close 0.1889066436100118
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