Delete row ('615', '20706') from daily_volatility

ticker_id 615
day 20706
implied_open 0.2476423227156457
implied_high 0.2555795766488395
implied_low 0.2428799703557294
implied_close 0.2476423227156457
historical_open 0.2206556593427869
historical_high 0.2206556593427869
historical_low 0.2206556593427869
historical_close 0.2206556593427869
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