Delete row ('6', '20131') from daily_volatility

ticker_id 6
day 20131
implied_open 1.546177066186147
implied_high 1.585863335852116
implied_low 1.531890009106398
implied_close 1.549351967759425
historical_open 1.115977903007044
historical_high 1.115977903007044
historical_low 1.115977903007044
historical_close 1.115977903007044
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