Delete row ('136', '20201') from daily_volatility

ticker_id 136
day 20201
implied_open 0.5143340548709564
implied_high 0.5143340548709564
implied_low 0.4746477852049876
implied_close 0.4952846454312914
historical_open 0.6381552162287792
historical_high 0.6381552162287792
historical_low 0.6381552162287792
historical_close 0.6381552162287792
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