테넌트 목록 조회 cursor기반으로 재구성. 사용자 metadata 미사용 필드 제거

backend/internal/repository/tenant_repository.go

@@ -4,6 +4,7 @@ import (
 	"baron-sso-backend/internal/domain"
 	"context"
 	"errors"
+	"strconv"
 	"strings"
 	"time"
 
@@ -33,7 +34,19 @@ func NewTenantRepository(db *gorm.DB) TenantRepository {
 }
 
 func (r *tenantRepository) Create(ctx context.Context, tenant *domain.Tenant) error {
-	return r.db.WithContext(ctx).Create(tenant).Error
+	tenant.Slug = strings.ToLower(strings.TrimSpace(tenant.Slug))
+	return r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		if tenant.Slug != "" {
+			suffix := "-deleted-" + strconv.FormatInt(time.Now().UTC().UnixNano(), 10)
+			if err := tx.Unscoped().
+				Model(&domain.Tenant{}).
+				Where("slug = ? AND deleted_at IS NOT NULL", tenant.Slug).
+				Update("slug", gorm.Expr("slug || ?", suffix)).Error; err != nil {
+				return err
+			}
+		}
+		return tx.Create(tenant).Error
+	})
 }
 
 func (r *tenantRepository) Update(ctx context.Context, tenant *domain.Tenant) error {
@@ -124,7 +137,7 @@ func (r *tenantRepository) List(ctx context.Context, limit, offset int, parentID
 		return nil, 0, err
 	}
 
-	if err := db.Order("created_at desc").Limit(limit).Offset(offset).Preload("Domains").Find(&tenants).Error; err != nil {
+	if err := db.Order("created_at desc, id desc").Limit(limit).Offset(offset).Preload("Domains").Find(&tenants).Error; err != nil {
 		return nil, 0, err
 	}