Delete row ('600', '20517') from daily_volatility

ticker_id 600
day 20517
implied_open 0.8651606787181212
implied_high 0.8937347928776188
implied_low 0.8572234247849274
implied_close 0.8826226373711474
historical_open 1.08264143648763
historical_high 1.08264143648763
historical_low 1.08264143648763
historical_close 1.08264143648763
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