What db are you checking? The one you have in your files tab or the one in xui.DefaultFolder? (log xui.DefaultFolder and check that one too).
Because if you have the old db in xui.DefaultFolder, the new one will be not copied
B4X:
'copy the default DB
If File.Exists(xui.DefaultFolder, "jobs.db") = False Then
File.Copy(File.DirAssets, "jobs.db", xui.DefaultFolder, "jobs.db")
End If