How to edit a previously applied migration without first adding the first migration to the EF code

I have application migration using the "haward" db scheme.

public partial class CreateCourseCategoryTable : DbMigration
    {
        public override void Up()
        {
            CreateTable(
                "haward.CourseCategories",
                c => new
                    {
                        Id = c.Int(nullable: false, identity: true),
                        Name = c.String(),
                        Code = c.String(),
                    })
                .PrimaryKey(t => t.Id);
        }

        public override void Down()
        {
            DropTable("haward.CourseCategories");
        }
    }

with this mapping

public class CourseCategoryMapping : EntityTypeConfiguration<CourseCategory>
    {
        public CourseCategoryMapping()
        {
            ToTable("CourseCategories", "haward");
        }
    }

now I want to change the schema from "haward" to "tr" I don't want to add migration with this, so I thought just editing the source code of the migration and mapping.

public partial class CreateCourseCategoryTable : DbMigration
        {
            public override void Up()
            {
                CreateTable(
                    "tr.CourseCategories",
                    c => new
                        {
                            Id = c.Int(nullable: false, identity: true),
                            Name = c.String(),
                            Code = c.String(),
                        })
                    .PrimaryKey(t => t.Id);
            }

            public override void Down()
            {
                DropTable("tr.CourseCategories");
            }
        }


    public class CourseCategoryMapping : EntityTypeConfiguration<CourseCategory>
        {
            public CourseCategoryMapping()
            {
                ToTable("CourseCategories", "tr");
            }
        }

then recreate the empty database and issue the update-database command but it says that I still have pending changes.

therefore, the add-migration command was issued to me to check which particular changes. and it looks like it still detects my changes (from "haward" to "tr") even without a migration table.

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