Delete row ('615', '20328') from daily_volatility

ticker_id 615
day 20328
implied_open 0.2508172242889232
implied_high 0.252404675075562
implied_low 0.2444674211423682
implied_close 0.2460548719290069
historical_open 0.1508078247306817
historical_high 0.1508078247306817
historical_low 0.1508078247306817
historical_close 0.1508078247306817
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