Revert "PERF: Reuse one cursor in asset finder lookups."
Revert "PERF: Reuse one cursor in asset finder lookups."

This reverts commit 136a09776d438754089eeb561f9d3317f53c8c1d.

kmather73/zipline,morrisonwudi/zipline,michaeljohnbennett/zipline,dmitriz/zipline,Scapogo/zipline,kmather73/zipline,magne-max/zipline-ja,bartosh/zipline,umuzungu/zipline,joequant/zipline,MonoCloud/zipline,otmaneJai/Zipline,DVegaCapital/zipline,euri10/zipline,euri10/zipline,semio/zipline,semio/zipline,ChinaQuants/zipline,alphaBenj/zipline,zhoulingjun/zipline,umuzungu/zipline,jimgoo/zipline-fork,DVegaCapital/zipline,wubr2000/zipline,quantopian/zipline,enigmampc/catalyst,quantopian/zipline,bartosh/zipline,nborggren/zipline,cmorgan/zipline,jordancheah/zipline,dmitriz/zipline,dkushner/zipline,zhoulingjun/zipline,Scapogo/zipline,AlirezaShahabi/zipline,nborggren/zipline,jimgoo/zipline-fork,sketchytechky/zipline,wilsonkichoi/zipline,dkushner/zipline,florentchandelier/zipline,aajtodd/zipline,chrjxj/zipline,iamkingmaker/zipline,enigmampc/catalyst,ChinaQuants/zipline,humdings/zipline,YuepengGuo/zipline,florentchandelier/zipline,otmaneJai/Zipline,gwulfs/zipline,wilsonkichoi/zipline,humdings/zipline,ronalcc/zipline,keir-rex/zipline,AlirezaShahabi/zipline,chrjxj/zipline,joequant/zipline,YuepengGuo/zipline,jordancheah/zipline,grundgruen/zipline,keir-rex/zipline,michaeljohnbennett/zipline,wubr2000/zipline,ronalcc/zipline,MonoCloud/zipline,gwulfs/zipline,CDSFinance/zipline,sketchytechky/zipline,magne-max/zipline-ja,morrisonwudi/zipline,alphaBenj/zipline,aajtodd/zipline,iamkingmaker/zipline,cmorgan/zipline,grundgruen/zipline,CDSFinance/zipline