Delete row ('1502', '20731') from daily_volatility

ticker_id 1502
day 20731
implied_open 0.8286493106254299
implied_high 0.8413489169185399
implied_low 0.8032500980392098
implied_close 0.8318242121987074
historical_open 0.7127654032008007
historical_high 0.7127654032008007
historical_low 0.7127654032008007
historical_close 0.7127654032008007
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