Delete row ('615', '20486') from daily_volatility

ticker_id 615
day 20486
implied_open 0.2333552656358969
implied_high 0.2476423227156457
implied_low 0.2333552656358969
implied_close 0.2444674211423682
historical_open 0.2031937006897606
historical_high 0.2031937006897606
historical_low 0.2031937006897606
historical_close 0.2031937006897606
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