Delete row ('1993', '20669') from daily_volatility

ticker_id 1993
day 20669
implied_open 1.027080658955274
implied_high 1.068354379407882
implied_low 0.9524704719832526
implied_close 1.041367716035023
historical_open 0.7683261807331572
historical_high 0.7683261807331572
historical_low 0.7683261807331572
historical_close 0.7683261807331572
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