Delete row ('2519', '20181') from daily_volatility

ticker_id 2519
day 20181
implied_open 0.7461018697202146
implied_high 0.7857881393861835
implied_low 0.7461018697202146
implied_close 0.7842006885995447
historical_open 0.8127748027590423
historical_high 0.8127748027590423
historical_low 0.8127748027590423
historical_close 0.8127748027590423
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