Delete row ('1993', '20689') from daily_volatility

ticker_id 1993
day 20689
implied_open 0.8016626472525711
implied_high 0.8365865645586236
implied_low 0.7476893205068534
implied_close 0.7794383362396284
historical_open 0.9000845960241738
historical_high 0.9000845960241738
historical_low 0.9000845960241738
historical_close 0.9000845960241738
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