Delete row ('615', '20340') from daily_volatility

ticker_id 615
day 20340
implied_open 0.2444674211423682
implied_high 0.2492297735022844
implied_low 0.2444674211423682
implied_close 0.2492297735022844
historical_open 0.1523952755173204
historical_high 0.1523952755173204
historical_low 0.1523952755173204
historical_close 0.1523952755173204
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