테넌트 목록 조회 cursor기반으로 재구성. 사용자 metadata 미사용 필드 제거

backend/internal/repository/tenant_repository_test.go

@@ -6,6 +6,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestTenantRepository(t *testing.T) {
@@ -161,4 +162,31 @@ func TestTenantRepository(t *testing.T) {
 		err = repo.Create(ctx, tenant2)
 		assert.Error(t, err) // Should fail due to UNIQUE constraint
 	})
+
+	t.Run("Create reuses slug held by legacy soft-deleted tenant", func(t *testing.T) {
+		slug := "legacy-soft-delete-reuse"
+		require.NoError(t, testDB.Unscoped().Where("slug = ?", slug).Delete(&domain.Tenant{}).Error)
+
+		legacy := &domain.Tenant{
+			Name: "Legacy Deleted",
+			Slug: slug,
+			Type: domain.TenantTypeCompany,
+		}
+		require.NoError(t, repo.Create(ctx, legacy))
+		require.NoError(t, testDB.Delete(&domain.Tenant{}, "id = ?", legacy.ID).Error)
+
+		_, err := repo.FindBySlug(ctx, slug)
+		require.Error(t, err)
+
+		replacement := &domain.Tenant{
+			Name: "Replacement",
+			Slug: slug,
+			Type: domain.TenantTypeCompany,
+		}
+		require.NoError(t, repo.Create(ctx, replacement))
+
+		found, err := repo.FindBySlug(ctx, slug)
+		require.NoError(t, err)
+		assert.Equal(t, replacement.ID, found.ID)
+	})
 }