Delete row ('1992', '20181') from daily_volatility

ticker_id 1992
day 20181
implied_open 0.6810163874680256
implied_high 0.8905598913043412
implied_low 0.6810163874680256
implied_close 0.736577165000382
historical_open 0.8683355802913987
historical_high 0.8683355802913987
historical_low 0.8683355802913987
historical_close 0.8683355802913987
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