public override void Up()
{
DropForeignKey("Participants", "ReviewId", "Reviews");
DropForeignKey("Participants", "UserId", "Users");
DropIndex("Participants", new[] { "ReviewId" });
DropIndex("Participants", new[] { "UserId" });
AddColumn("FileChanges", "Discriminator", c => c.String(nullable: false, maxLength: 128));
DropTable("Participants");
}