Delete row ('615', '20046') from daily_volatility

ticker_id 615
day 20046
implied_open 0.2587544782221169
implied_high 0.2666917321553107
implied_low 0.2587544782221169
implied_close 0.2603419290087557
historical_open 0.1841442912500955
historical_high 0.1841442912500955
historical_low 0.1841442912500955
historical_close 0.1841442912500955
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