Delete row ('615', '20518') from daily_volatility

ticker_id 615
day 20518
implied_open 0.2635168305820332
implied_high 0.2635168305820332
implied_low 0.2365301672091744
implied_close 0.2397050687824519
historical_open 0.2270054624893419
historical_high 0.2270054624893419
historical_low 0.2270054624893419
historical_close 0.2270054624893419
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