public override void Down()
{
AddColumn("DiffLines", "Hunk_Id", c => c.Int());
DropIndex("DiffLines", new[] { "ChangeId" });
DropForeignKey("DiffLines", "ChangeId", "FileChanges");
CreateIndex("DiffLines", "Hunk_Id");
AddForeignKey("DiffLines", "Hunk_Id", "FileChanges", "Id");
}