Delete row ('615', '20528') from daily_volatility

ticker_id 615
day 20528
implied_open 0.2254180117027031
implied_high 0.2301803640626194
implied_low 0.2158933069828706
implied_close 0.2174807577695094
historical_open 0.2270054624893419
historical_high 0.2270054624893419
historical_low 0.2270054624893419
historical_close 0.2270054624893419
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