refactor

internal/domain/entities/user.go

@@ -0,0 +1,32 @@
+package entities
+
+import "time"
+
+// User represents a registered user
+type User struct {
+	ID        int       `json:"id" db:"id"`
+	Username  string    `json:"username" db:"username"`
+	Email     string    `json:"email" db:"email"`
+	Password  string    `json:"-" db:"password"` // Hidden from JSON
+	CreatedAt time.Time `json:"created_at" db:"created_at"`
+	UpdatedAt time.Time `json:"updated_at" db:"updated_at"`
+}
+
+// Validate validates user data
+func (u *User) Validate() error {
+	if u.Username == "" {
+		return ErrInvalidUsername
+	}
+	if u.Email == "" {
+		return ErrInvalidEmail
+	}
+	if u.Password == "" {
+		return ErrInvalidPassword
+	}
+	return nil
+}
+
+// ClearPassword removes password from user for safe serialization
+func (u *User) ClearPassword() {
+	u.Password = ""
+}