Delete row ('615', '20551') from daily_volatility

ticker_id 615
day 20551
implied_open 0.2238305609160644
implied_high 0.2238305609160644
implied_low 0.2063686022630381
implied_close 0.2095435038363156
historical_open 0.2047811514763993
historical_high 0.2047811514763993
historical_low 0.2047811514763993
historical_close 0.2047811514763993
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