Delete row ('193', '20151') from daily_volatility

ticker_id 193
day 20151
implied_open 0.8826226373711474
implied_high 1.063592027047966
implied_low 0.8619857771448437
implied_close 0.89214734209098
historical_open 1.319171603696805
historical_high 1.319171603696805
historical_low 1.319171603696805
historical_close 1.319171603696805
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