Gorm New entries from nowhere?

Go Version: 1.20 Gorm Version: gorm.io/gorm v1.25.2 Driver: gorm.io/driver/postgres v1.5.2

I have the following code.

type User struct {
    gorm.Model
    FullName string `json:"fullname"`
    Email    string `json:"email"`
    Password string `json:"password"`
}

type PostgresStore struct {
    db *gorm.DB
}

func NewPostgresStore(dsn string) (*PostgresStore, error) {
    db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{})
    if err != nil {
        return nil, err
    }

    db.AutoMigrate(User{})

    return &PostgresStore{
        db: db,
    }, nil
}

func (s *PostgresStore) CreateUser(u *User) error {
    user := new(User)
    if res := s.db.Where("email = ? AND full_name = ?", u.Email, u.FullName).First(user); res.RowsAffected > 0 {
        return errors.New("Record already exists")
    }
    if res := s.db.Create(u); res.Error != nil {
        return res.Error
    }
    return nil
}

func (s *PostgresStore) FindUser(id int) (*User, error) {
    user := new(User)
    if err := s.db.Where("id = ?", id).First(user).Error; err != nil {
        return nil, err
    }

    return user, nil
}

When creating new entry, the library gets another column fullName from nowhere and causes the next error:

ERROR: null value in column "fullName" of relation "users" violates not-null constraint (SQLSTATE 23502)
[1.732ms] [rows:0] INSERT INTO "users" ("created_at","updated_at","deleted_at","full_name","email","password") VALUES ('2023-08-07 13:11:41.535','2023-08-07 13:11:41.535',NULL,'yuser','hello@mail.s','123') RETURNING "id"

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Comment From: intervinn

That is completely my issue. I did not notice that AutoMigrate() does not delete any columns.