Delete row ('40', '20517') from daily_volatility

ticker_id 40
day 20517
implied_open 0.5063968009377626
implied_high 0.5175089564442339
implied_low 0.5016344485778464
implied_close 0.5143340548709564
historical_open 0.4778226867782651
historical_high 0.4778226867782651
historical_low 0.4778226867782651
historical_close 0.4778226867782651
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