테넌트 등록 방식을 결정

backend/internal/domain/tenant_domain.go

@@ -0,0 +1,27 @@
+package domain
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+// TenantDomain represents a domain associated with a tenant for auto-assignment.
+type TenantDomain struct {
+	ID        string         `gorm:"primaryKey;type:uuid;default:gen_random_uuid()" json:"id"`
+	TenantID  string         `gorm:"type:uuid;not null;index" json:"tenantId"`
+	Domain    string         `gorm:"uniqueIndex;not null" json:"domain"` // e.g. "example.com"
+	Verified  bool           `gorm:"default:false" json:"verified"`
+	CreatedAt time.Time      `json:"createdAt"`
+	UpdatedAt time.Time      `json:"updatedAt"`
+	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`
+}
+
+// BeforeCreate hook to generate UUID if not present.
+func (td *TenantDomain) BeforeCreate(tx *gorm.DB) (err error) {
+	if td.ID == "" {
+		td.ID = uuid.NewString()
+	}
+	return
+}