Delete row ('1992', '20201') from daily_volatility

ticker_id 1992
day 20201
implied_open 0.8905598913043412
implied_high 0.9191340054638388
implied_low 0.769913631519796
implied_close 0.8397614661319012
historical_open 0.9985065447957765
historical_high 0.9985065447957765
historical_low 0.9985065447957765
historical_close 0.9985065447957765
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