Delete row ('510', '20151') from daily_volatility

ticker_id 510
day 20151
implied_open 0.6349803146555018
implied_high 0.6857787398279419
implied_low 0.5984689465628104
implied_close 0.6254556099356692
historical_open 0.8334116629853461
historical_high 0.8334116629853461
historical_low 0.8334116629853461
historical_close 0.8334116629853461
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