Added unique index to MailImporters.miHandle for uniqueness constraint and query where
Added unique index to MailImporters.miHandle for uniqueness constraint and query where

Added index to MailImporters.pkgID for query where and potential join to packages table


Former-commit-id: 693ad0d04c2efffbb7ed620b834a3fc0ac8d9d76
olsgreen/concrete5,mainio/concrete5,deek87/concrete5,triplei/concrete5-8,deek87/concrete5,biplobice/concrete5,olsgreen/concrete5,biplobice/concrete5,mlocati/concrete5,KorvinSzanto/concrete5,MrKarlDilkington/concrete5,hissy/concrete5,jaromirdalecky/concrete5,haeflimi/concrete5,hissy/concrete5,MrKarlDilkington/concrete5,triplei/concrete5-8,acliss19xx/concrete5,mlocati/concrete5,acliss19xx/concrete5,a3020/concrete5,concrete5/concrete5,triplei/concrete5-8,haeflimi/concrete5,hissy/concrete5,concrete5/concrete5,olsgreen/concrete5,mainio/concrete5,KorvinSzanto/concrete5,haeflimi/concrete5,rikzuiderlicht/concrete5,haeflimi/concrete5,MrKarlDilkington/concrete5,biplobice/concrete5,KorvinSzanto/concrete5,jaromirdalecky/concrete5,mainio/concrete5,rikzuiderlicht/concrete5,concrete5/concrete5,rikzuiderlicht/concrete5,acliss19xx/concrete5,deek87/concrete5,deek87/concrete5,mlocati/concrete5,mlocati/concrete5,biplobice/concrete5,jaromirdalecky/concrete5,a3020/concrete5,hissy/concrete5,jaromirdalecky/concrete5,concrete5/concrete5