Delete row ('600', '20515') from daily_volatility

ticker_id 600
day 20515
implied_open 0.8715104818646762
implied_high 0.9191340054638388
implied_low 0.8715104818646762
implied_close 0.89214734209098
historical_open 1.039780265248384
historical_high 1.039780265248384
historical_low 1.039780265248384
historical_close 1.039780265248384
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