Delete row ('510', '20171') from daily_volatility

ticker_id 510
day 20171
implied_open 0.5079842517244014
implied_high 0.5444956198170927
implied_low 0.4587732773386
implied_close 0.5063968009377626
historical_open 0.6619669780283606
historical_high 0.6619669780283606
historical_low 0.6619669780283606
historical_close 0.6619669780283606
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