Delete row ('615', '20717') from daily_volatility

ticker_id 615
day 20717
implied_open 0.2270054624893419
implied_high 0.2381176179958132
implied_low 0.2111309546229543
implied_close 0.2254180117027031
historical_open 0.1857317420367343
historical_high 0.1857317420367343
historical_low 0.1857317420367343
historical_close 0.1857317420367343
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