Delete row ('857', '20734') from daily_volatility

ticker_id 857
day 20734
implied_open 0.671491682748193
implied_high 0.671491682748193
implied_low 0.6413301178020567
implied_close 0.6651418796016381
historical_open 0.5444956198170927
historical_high 0.5444956198170927
historical_low 0.5444956198170927
historical_close 0.5444956198170927
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