Delete row ('615', '20718') from daily_volatility

ticker_id 615
day 20718
implied_open 0.2285929132759806
implied_high 0.2333552656358969
implied_low 0.2190682085561481
implied_close 0.2301803640626194
historical_open 0.1841442912500955
historical_high 0.1841442912500955
historical_low 0.1841442912500955
historical_close 0.1841442912500955
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