Delete row ('697', '20070') from daily_volatility

ticker_id 697
day 20070
implied_open 0.1904940943966505
implied_high 0.1920815451832893
implied_low 0.1857317420367343
implied_close 0.1857317420367343
historical_open 0.2000187991164831
historical_high 0.2000187991164831
historical_low 0.2000187991164831
historical_close 0.2000187991164831
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