Delete row ('1512', '20188') from daily_volatility

ticker_id 1512
day 20188
implied_open 0.5794195371231453
implied_high 0.7984877456792935
implied_low 0.5794195371231453
implied_close 0.7397520665736596
historical_open 0.6889536414012194
historical_high 0.6889536414012194
historical_low 0.6889536414012194
historical_close 0.6889536414012194
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