Delete row ('615', '20131') from daily_volatility

ticker_id 615
day 20131
implied_open 0.2587544782221169
implied_high 0.265104281368672
implied_low 0.2587544782221169
implied_close 0.2603419290087557
historical_open 0.2016062499031218
historical_high 0.2016062499031218
historical_low 0.2016062499031218
historical_close 0.2016062499031218
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