I dug around a bit to see if this was already answered, but I've been coming up empty. My Searchfu may just be weak though. When we go through a migration will there be a table/field that keeps the mapping of old user id values to new user id values? The reason I ask is that we have a lot of things that are keyed in the file system (and other database tables) that are related to the existing userid. One good example is our gallery system, all images files are stored in /gallery/images/[userid]/ with /large, /medium and /small sub dirs to hold the various thumbnail sizes. After the migration is complete will the old user ID be preserved in a lookup table so that we can map queries back for legacy systems that reference the original userid? TIA!