Delete row ('518', '20733') from daily_volatility

ticker_id 518
day 20733
implied_open 0.7746759838797123
implied_high 0.7921379425327385
implied_low 0.7349897142137433
implied_close 0.7857881393861835
historical_open 0.5730697339765903
historical_high 0.5730697339765903
historical_low 0.5730697339765903
historical_close 0.5730697339765903
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