MAINT: Refactors table assignment in AssetDBWriter
MAINT: Refactors table assignment in AssetDBWriter

wilsonkichoi/zipline,florentchandelier/zipline,nborggren/zipline,humdings/zipline,humdings/zipline,bartosh/zipline,alphaBenj/zipline,grundgruen/zipline,Scapogo/zipline,magne-max/zipline-ja,wilsonkichoi/zipline,magne-max/zipline-ja,enigmampc/catalyst,florentchandelier/zipline,Scapogo/zipline,nborggren/zipline,alphaBenj/zipline,umuzungu/zipline,enigmampc/catalyst,quantopian/zipline,grundgruen/zipline,quantopian/zipline,bartosh/zipline,umuzungu/zipline