Delete row ('1544', '19971') from daily_volatility

ticker_id 1544
day 19971
implied_open 0.168269783383708
implied_high 0.1777944881035405
implied_low 0.1666823325970692
implied_close 0.1730321357436242
historical_open 0.2143058561962319
historical_high 0.2143058561962319
historical_low 0.2143058561962319
historical_close 0.2143058561962319
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