Delete row ('615', '20318') from daily_volatility

ticker_id 615
day 20318
implied_open 0.1904940943966505
implied_high 0.2095435038363156
implied_low 0.1857317420367343
implied_close 0.1857317420367343
historical_open 0.1460454723707654
historical_high 0.1460454723707654
historical_low 0.1460454723707654
historical_close 0.1460454723707654
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