perf(admin): implement server-side search and virtualization for tenant list

- Backend: Added 'search' parameter to TenantRepository and TenantService.
- Backend: Updated all Tenant list calls to support searching.
- Backend: Enhanced UserRepository.List to support cursor-based pagination and search.
- Frontend: Switched TenantListPage to use useInfiniteQuery for lazy loading.
- Frontend: Implemented list virtualization in TenantHierarchyView using @tanstack/react-virtual.
- Frontend: Added server-side search with debouncing (useDeferredValue).
- Fixed various Go compilation errors caused by method signature changes.

adminfront/src/features/tenants/routes/TenantListPage.tsx

@@ -4,6 +4,7 @@ import {
   useMutation,
   useQuery,
 } from "@tanstack/react-query";
+import { useVirtualizer } from "@tanstack/react-virtual";
 import type { AxiosError } from "axios";
 import {
   ArrowDown,
@@ -93,6 +94,7 @@ import {
 import { t } from "../../../lib/i18n";
 import { normalizeAdminRole } from "../../../lib/roles";
 import { buildTenantFullTree, type TenantNode } from "../../../lib/tenantTree";
+import { cn } from "../../../lib/utils";
 import {
   buildAuthenticatedOrgChartTenantPickerUrl,
   filterNonHanmacFamilyTenants,
@@ -115,7 +117,6 @@ import {
   resolveTenantSelectionIds,
   type TenantViewMode,
   type TenantViewRow,
-  tenantMatchesListSearch,
 } from "./tenantListView";
 
 const tenantCSVTemplate =
@@ -264,7 +265,6 @@ function resolveImportParentSelection(
 function TenantListPage() {
   const navigate = useNavigate();
   const [selectedIds, setSelectedIds] = React.useState<string[]>([]);
-  const [search, setSearch] = React.useState("");
   const [viewMode, setViewMode] = React.useState<TenantViewMode>("tree");
   const [scopeTenantId, setScopeTenantId] = React.useState("");
   const [scopePickerOpen, setScopePickerOpen] = React.useState(false);
@@ -304,6 +304,8 @@ function TenantListPage() {
       (d: TenantImportDetail) => d.action === importResultFilter,
     );
   }, [importResult, importResultFilter]);
+  const [search, setSearch] = React.useState("");
+  const debouncedSearch = React.useDeferredValue(search.trim());
   const [selectedBulkStatus, setSelectedBulkStatus] = React.useState("");
   const _tenantTableScrollRef = React.useRef<HTMLDivElement | null>(null);
 
@@ -314,18 +316,18 @@ function TenantListPage() {
   const profileRole = normalizeAdminRole(profile?.role);
 
   const query = useInfiniteQuery({
-    queryKey: ["tenants", "lazy"],
+    queryKey: ["tenants", "lazy", debouncedSearch, scopeTenantId],
     queryFn: ({ pageParam }) =>
       fetchTenants(
         tenantPageSize,
         0,
-        undefined,
+        scopeTenantId || undefined,
-        pageParam ? pageParam : undefined,
+        pageParam ? (pageParam as string) : undefined,
+        debouncedSearch,
       ),
     initialPageParam: "",
     getNextPageParam: (lastPage) =>
       lastPage.nextCursor || lastPage.next_cursor || undefined,
-    enabled: profileRole === "super_admin",
   });
 
   const deleteBulkMutation = useMutation({
@@ -436,6 +438,11 @@ function TenantListPage() {
     },
   });
 
+  const rawTenants = React.useMemo(
+    () => query.data?.pages.flatMap((page) => page.items) ?? [],
+    [query.data?.pages],
+  );
+
   const errorMsg = (query.error as AxiosError<{ error?: string }>)?.response
     ?.data?.error;
   const fallbackError =
@@ -443,15 +450,7 @@ function TenantListPage() {
       ? t("msg.admin.tenants.fetch_error", "테넌트 목록 조회에 실패했습니다.")
       : null;
 
-  const tenantPages = React.useMemo(
+  const tenantTotal = query.data?.pages[0]?.total ?? 0;
-    () => query.data?.pages ?? [],
-    [query.data?.pages],
-  );
-  const rawTenants = React.useMemo(
-    () => tenantPages.flatMap((page) => page.items),
-    [tenantPages],
-  );
-  const tenantTotal = tenantPages[0]?.total ?? 0;
   const hanmacFamilyTenantId = React.useMemo(() => {
     const envTenantId = import.meta.env.VITE_HANMAC_FAMILY_TENANT_ID;
     if (typeof envTenantId === "string" && envTenantId.trim()) {
@@ -924,6 +923,10 @@ function TenantListPage() {
             getSortIcon={getSortIcon}
             viewMode={viewMode}
             scopeTenantId={scopeTenantId}
+            fetchNextPage={query.fetchNextPage}
+            hasNextPage={!!query.hasNextPage}
+            isFetchingNextPage={query.isFetchingNextPage}
+            isLoading={query.isLoading}
           />
         </CardContent>
       </Card>
@@ -1500,6 +1503,10 @@ const TenantHierarchyView: React.FC<{
   getSortIcon: (key: TenantSortKey) => React.ReactNode;
   viewMode: TenantViewMode;
   scopeTenantId: string;
+  fetchNextPage: () => void;
+  hasNextPage: boolean;
+  isFetchingNextPage: boolean;
+  isLoading: boolean;
 }> = ({
   tenants,
   selectedIds,
@@ -1514,7 +1521,13 @@ const TenantHierarchyView: React.FC<{
   getSortIcon,
   viewMode,
   scopeTenantId,
+  fetchNextPage,
+  hasNextPage,
+  isFetchingNextPage,
+  isLoading,
 }) => {
+  const parentRef = React.useRef<HTMLDivElement>(null);
+
   const { subTree } = React.useMemo(
     () => buildTenantFullTree(tenants, scopeTenantId || undefined),
     [scopeTenantId, tenants],
@@ -1569,51 +1582,26 @@ const TenantHierarchyView: React.FC<{
   const flattenedRows = React.useMemo(() => {
     if (viewMode === "table") {
       return sortItems(
-        getTenantViewRows(tenants, "table", scopeTenantId).filter((tenant) =>
+        getTenantViewRows(tenants, "table", scopeTenantId),
-          tenantMatchesListSearch(tenant, search),
-        ),
         sortConfig,
         tenantSortResolvers,
       );
     }
 
     const result: TenantViewRow[] = [];
-    const term = search.toLowerCase().trim();
-
-    // When searching, we show matched nodes and all their ancestors.
-    const matchedIds = new Set<string>();
-    if (term) {
-      const findMatches = (nodes: TenantNode[]) => {
-        for (const node of nodes) {
-          if (tenantMatchesListSearch(node, term)) {
-            matchedIds.add(node.id);
-          }
-          if (node.children) findMatches(node.children);
-        }
-      };
-      findMatches(subTree);
-    }
 
     const collect = (nodes: TenantNode[], depth: number) => {
       // Sort nodes at the current depth
       const sortedNodes = sortItems(nodes, sortConfig, tenantSortResolvers);
 
       for (const node of sortedNodes) {
-        // If searching, show node if it matches OR any of its descendants match.
+        result.push({ ...node, depth });
-        const hasMatchingDescendant = (n: TenantNode): boolean => {
+        if (
-          if (matchedIds.has(n.id)) return true;
+          expandedIds.has(node.id) &&
-          return n.children.some(hasMatchingDescendant);
+          node.children &&
-        };
+          node.children.length > 0
-
+        ) {
-        if (!term || hasMatchingDescendant(node)) {
+          collect(node.children, depth + 1);
-          result.push({ ...node, depth });
-          if (
-            (term || expandedIds.has(node.id)) &&
-            node.children &&
-            node.children.length > 0
-          ) {
-            collect(node.children, depth + 1);
-          }
         }
       }
     };
@@ -1622,7 +1610,6 @@ const TenantHierarchyView: React.FC<{
   }, [
     expandedIds,
     scopeTenantId,
-    search,
     sortConfig,
     subTree,
     tenantSortResolvers,
@@ -1630,6 +1617,34 @@ const TenantHierarchyView: React.FC<{
     viewMode,
   ]);
 
+  const rowVirtualizer = useVirtualizer({
+    count: flattenedRows.length,
+    getScrollElement: () => parentRef.current,
+    estimateSize: () => _tenantEstimatedRowHeight,
+    overscan: 10,
+  });
+
+  const virtualRows = rowVirtualizer.getVirtualItems();
+
+  React.useEffect(() => {
+    const lastItem = virtualRows[virtualRows.length - 1];
+    if (!lastItem) return;
+
+    if (
+      lastItem.index >= flattenedRows.length - 1 &&
+      hasNextPage &&
+      !isFetchingNextPage
+    ) {
+      fetchNextPage();
+    }
+  }, [
+    virtualRows,
+    flattenedRows.length,
+    hasNextPage,
+    isFetchingNextPage,
+    fetchNextPage,
+  ]);
+
   const visibleSelectableIds = React.useMemo(
     () => new Set(deletableTenants.map((tenant) => tenant.id)),
     [deletableTenants],
@@ -1640,11 +1655,15 @@ const TenantHierarchyView: React.FC<{
 
   return (
     <div className="flex-1 rounded-md border overflow-hidden flex flex-col mt-4">
-      <div className="flex-1 overflow-auto relative custom-scrollbar">
+      <div
-        <Table className="min-w-[1180px]">
+        ref={parentRef}
+        className="flex-1 overflow-auto relative custom-scrollbar"
+        data-testid="tenant-table-container"
+      >
+        <Table className="min-w-[1180px] relative border-separate border-spacing-0">
           <TableHeader className="sticky top-0 z-10 bg-secondary shadow-sm">
             <TableRow>
-              <TableHead className="w-[48px] whitespace-nowrap">
+              <TableHead className="w-[48px] whitespace-nowrap px-4 text-center">
                 <Checkbox
                   checked={
                     deletableTenants.length > 0 &&
@@ -1718,8 +1737,14 @@ const TenantHierarchyView: React.FC<{
               </TableHead>
             </TableRow>
           </TableHeader>
-          <TableBody>
+          <TableBody className="relative">
-            {flattenedRows.length === 0 && (
+            {rowVirtualizer.getTotalSize() > 0 && virtualRows.length > 0 && (
+              <tr style={{ height: `${virtualRows[0].start}px` }}>
+                <td colSpan={8} />
+              </tr>
+            )}
+
+            {flattenedRows.length === 0 && !isLoading && (
               <TableRow>
                 <TableCell
                   colSpan={8}
@@ -1732,7 +1757,10 @@ const TenantHierarchyView: React.FC<{
                 </TableCell>
               </TableRow>
             )}
-            {flattenedRows.map((node) => {
+
+            {virtualRows.map((virtualRow) => {
+              const node = flattenedRows[virtualRow.index];
+              const isSelected = selectedIds.includes(node.id);
               const hasChildren =
                 viewMode === "tree" &&
                 node.children &&
@@ -1744,16 +1772,16 @@ const TenantHierarchyView: React.FC<{
               return (
                 <TableRow
                   key={node.id}
-                  className={
+                  data-index={virtualRow.index}
-                    selectedIds.includes(node.id) ? "bg-primary/5" : ""
+                  ref={rowVirtualizer.measureElement}
-                  }
+                  className={cn(isSelected ? "bg-primary/5" : "", "h-[73px]")}
                 >
-                  <TableCell className="text-center">
+                  <TableCell className="text-center px-4">
                     {isSeedTenant(node) ? (
                       <span className="inline-block h-4 w-4" />
                     ) : (
                       <Checkbox
-                        checked={selectedIds.includes(node.id)}
+                        checked={isSelected}
                         onCheckedChange={(checked) => onSelect(node, !!checked)}
                       />
                     )}
@@ -1761,27 +1789,34 @@ const TenantHierarchyView: React.FC<{
                   <TableCell className="font-semibold p-0">
                     <div
                       className="flex items-center h-full min-h-[3rem] py-1"
-                      style={{ paddingLeft: `${node.depth * 28 + 12}px` }}
+                      style={{
+                        paddingLeft:
+                          viewMode === "tree"
+                            ? `${node.depth * 28 + 12}px`
+                            : "12px",
+                      }}
                     >
-                      <div className="w-5 flex items-center justify-center mr-1.5 shrink-0">
+                      {viewMode === "tree" && (
-                        {hasChildren && !search ? (
+                        <div className="w-5 flex items-center justify-center mr-1.5 shrink-0">
-                          <button
+                          {hasChildren && !search ? (
-                            type="button"
+                            <button
-                            onClick={() => toggleExpand(node.id)}
+                              type="button"
-                            className="p-0.5 hover:bg-black/5 rounded cursor-pointer transition-colors text-muted-foreground hover:text-foreground"
+                              onClick={() => toggleExpand(node.id)}
-                          >
+                              className="p-0.5 hover:bg-black/5 rounded cursor-pointer transition-colors text-muted-foreground hover:text-foreground"
-                            {isExpanded ? (
+                            >
-                              <ChevronDown size={16} />
+                              {isExpanded ? (
-                            ) : (
+                                <ChevronDown size={16} />
-                              <ChevronRight size={16} />
+                              ) : (
-                            )}
+                                <ChevronRight size={16} />
-                          </button>
+                              )}
-                        ) : (
+                            </button>
-                          node.depth > 0 && (
+                          ) : (
-                            <div className="w-1 h-1 rounded-full bg-border" />
+                            node.depth > 0 && (
-                          )
+                              <div className="w-1 h-1 rounded-full bg-border" />
-                        )}
+                            )
-                      </div>
+                          )}
+                        </div>
+                      )}
 
                       <TypeIcon
                         size={14}
@@ -1857,6 +1892,27 @@ const TenantHierarchyView: React.FC<{
                 </TableRow>
               );
             })}
+
+            {rowVirtualizer.getTotalSize() > 0 && virtualRows.length > 0 && (
+              <tr
+                style={{
+                  height: `${rowVirtualizer.getTotalSize() - virtualRows[virtualRows.length - 1].end}px`,
+                }}
+              >
+                <td colSpan={8} />
+              </tr>
+            )}
+
+            {isFetchingNextPage && (
+              <TableRow>
+                <TableCell colSpan={8} className="text-center py-4">
+                  <div className="flex items-center justify-center gap-2 text-muted-foreground text-sm">
+                    <RefreshCw size={16} className="animate-spin" />
+                    {t("msg.common.loading_more", "Loading more...")}
+                  </div>
+                </TableCell>
+              </TableRow>
+            )}
           </TableBody>
         </Table>
       </div>

adminfront/src/lib/adminApi.ts

@@ -293,11 +293,12 @@ export async function fetchTenants(
   offset = 0,
   parentId?: string,
   cursor?: string,
+  search?: string,
 ) {
   const { data } = await apiClient.get<TenantListResponse>(
     "/v1/admin/tenants",
     {
-      params: { limit, offset, parentId, cursor },
+      params: { limit, offset, parentId, cursor, search },
     },
   );
   return data;

backend/internal/handler/admin_handler.go

@@ -235,7 +235,7 @@ func (h *AdminHandler) countTenants(ctx context.Context) int64 {
 	if h == nil || h.TenantRepo == nil {
 		return 0
 	}
-	_, total, err := h.TenantRepo.List(ctx, 1, 0, "")
+	_, total, err := h.TenantRepo.List(ctx, 1, 0, "", "")
 	if err != nil {
 		return 0
 	}

backend/internal/handler/auth_handler.go

@@ -629,7 +629,7 @@ func (h *AuthHandler) GetActiveTenants(c *fiber.Ctx) error {
 	}
 
 	// 3. List and Filter Tenants
-	tenants, _, err := h.TenantService.ListTenants(c.Context(), 1000, 0, "")
+	tenants, _, err := h.TenantService.ListTenants(c.Context(), 1000, 0, "", "")
 	if err != nil {
 		return errorJSON(c, fiber.StatusInternalServerError, "Failed to fetch tenants")
 	}

backend/internal/handler/dev_handler.go

@@ -3571,7 +3571,7 @@ func (h *DevHandler) ListMyTenants(c *fiber.Ctx) error {
 	}
 
 	if role == domain.RoleSuperAdmin {
-		tenants, _, err := h.TenantSvc.ListTenants(c.Context(), 100, 0, "")
+		tenants, _, err := h.TenantSvc.ListTenants(c.Context(), 100, 0, "", "")
 		if err != nil {
 			return errorJSON(c, fiber.StatusInternalServerError, "failed to list tenants")
 		}

backend/internal/handler/hanmac_email_policy.go

@@ -113,7 +113,7 @@ func (h *UserHandler) resolveHanmacEmailScope(ctx context.Context) (*hanmacEmail
 		return nil, nil
 	}
 
-	tenants, _, err := h.TenantService.ListTenants(ctx, 10000, 0, "")
+	tenants, _, err := h.TenantService.ListTenants(ctx, 10000, 0, "", "")
 	if err != nil {
 		return nil, err
 	}

backend/internal/handler/tenant_handler.go

@@ -269,7 +269,7 @@ func (h *TenantHandler) ListTenants(c *fiber.Ctx) error {
 
 	if role != domain.RoleSuperAdmin {
 		// Not a super admin: Only return the entire tree(s) of the tenants they belong to
-		allTenants, _, err := h.Service.ListTenants(c.Context(), 10000, 0, "")
+		allTenants, _, err := h.Service.ListTenants(c.Context(), 10000, 0, "", "")
 		if err != nil {
 			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
 		}
@@ -343,13 +343,13 @@ func (h *TenantHandler) ListTenants(c *fiber.Ctx) error {
 	} else {
 		// Super Admin case
 		if cursorRaw != "" && h.DB != nil {
-			tenants, total, nextCursor, err = h.listTenantsByCursor(c.Context(), limit, parentId, cursorRaw)
+			tenants, total, nextCursor, err = h.listTenantsByCursor(c.Context(), limit, parentId, cursorRaw, "")
 			if err != nil {
 				return errorJSON(c, fiber.StatusBadRequest, "invalid cursor")
 			}
 			offset = 0
 		} else {
-			tenants, total, err = h.Service.ListTenants(c.Context(), limit, offset, parentId)
+			tenants, total, err = h.Service.ListTenants(c.Context(), limit, offset, parentId, "")
 			if err != nil {
 				return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
 			}
@@ -382,7 +382,7 @@ func (h *TenantHandler) ListTenants(c *fiber.Ctx) error {
 	})
 }
 
-func (h *TenantHandler) listTenantsByCursor(ctx context.Context, limit int, parentID string, cursorRaw string) ([]domain.Tenant, int64, string, error) {
+func (h *TenantHandler) listTenantsByCursor(ctx context.Context, limit int, parentID string, cursorRaw string, search string) ([]domain.Tenant, int64, string, error) {
 	cursor, err := pagination.Decode(cursorRaw)
 	if err != nil {
 		return nil, 0, "", err
@@ -395,6 +395,12 @@ func (h *TenantHandler) listTenantsByCursor(ctx context.Context, limit int, pare
 		pageQuery = pageQuery.Where("parent_id = ?", parentID)
 	}
 
+	if search != "" {
+		searchTerm := "%" + strings.ToLower(search) + "%"
+		countQuery = countQuery.Where("LOWER(name) LIKE ? OR LOWER(slug) LIKE ? OR LOWER(description) LIKE ?", searchTerm, searchTerm, searchTerm)
+		pageQuery = pageQuery.Where("LOWER(name) LIKE ? OR LOWER(slug) LIKE ? OR LOWER(description) LIKE ?", searchTerm, searchTerm, searchTerm)
+	}
+
 	var total int64
 	if err := countQuery.Count(&total).Error; err != nil {
 		return nil, 0, "", err
@@ -422,7 +428,7 @@ func (h *TenantHandler) listTenantsByCursor(ctx context.Context, limit int, pare
 
 func (h *TenantHandler) ExportTenantsCSV(c *fiber.Ctx) error {
 	parentID := strings.TrimSpace(c.Query("parentId"))
-	allTenants, _, err := h.Service.ListTenants(c.Context(), 10000, 0, "")
+	allTenants, _, err := h.Service.ListTenants(c.Context(), 10000, 0, "", "")
 	if err != nil {
 		return errorJSON(c, fiber.StatusInternalServerError, err.Error())
 	}
@@ -566,7 +572,7 @@ func (h *TenantHandler) ImportTenantsCSV(c *fiber.Ctx) error {
 
 	tenantIDBySlug := make(map[string]string)
 	if h.Service != nil {
-		if tenants, _, err := h.Service.ListTenants(c.Context(), 10000, 0, ""); err == nil {
+		if tenants, _, err := h.Service.ListTenants(c.Context(), 10000, 0, "", ""); err == nil {
 			for _, tenant := range tenants {
 				tenantIDBySlug[strings.ToLower(tenant.Slug)] = tenant.ID
 			}
@@ -2336,7 +2342,7 @@ func (h *TenantHandler) GetOrgContext(c *fiber.Ctx) error {
 		return errorJSON(c, fiber.StatusServiceUnavailable, "tenant service is not configured")
 	}
 
-	allTenants, _, err := h.Service.ListTenants(c.Context(), 10000, 0, "")
+	allTenants, _, err := h.Service.ListTenants(c.Context(), 10000, 0, "", "")
 	if err != nil {
 		return errorJSON(c, fiber.StatusInternalServerError, err.Error())
 	}
@@ -2410,7 +2416,7 @@ func (h *TenantHandler) loadOrgContextMembers(ctx context.Context, tenantIDs, te
 	if err != nil {
 		return nil, err
 	}
-	usersByAppointment, _, err := h.UserRepo.List(ctx, 0, 10000, "", "")
+	usersByAppointment, _, _, err := h.UserRepo.List(ctx, 0, 10000, "", "", "")
 	if err != nil {
 		return nil, err
 	}
@@ -2741,7 +2747,7 @@ func (h *TenantHandler) GetPublicOrgChart(c *fiber.Ctx) error {
 		return errorJSON(c, fiber.StatusUnauthorized, err.Error())
 	}
 
-	allTenants, _, err := h.Service.ListTenants(c.Context(), 10000, 0, "")
+	allTenants, _, err := h.Service.ListTenants(c.Context(), 10000, 0, "", "")
 	if err != nil {
 		return errorJSON(c, fiber.StatusInternalServerError, err.Error())
 	}

backend/internal/handler/user_handler.go

@@ -486,7 +486,7 @@ func (h *UserHandler) ListUsers(c *fiber.Ctx) error {
 
 			// Expand manageableSlugs to the entire tenant tree (root + all descendants)
 			if h.TenantService != nil && len(baseTenantIDs) > 0 {
-				allTenants, _, err := h.TenantService.ListTenants(c.Context(), 10000, 0, "")
+				allTenants, _, err := h.TenantService.ListTenants(c.Context(), 10000, 0, "", "")
 				if err == nil {
 					parentMap := make(map[string]string)
 					for _, t := range allTenants {
@@ -1614,7 +1614,7 @@ func (h *UserHandler) ExportUsersCSV(c *fiber.Ctx) error {
 	}
 
 	// 1. Fetch Users using Repo for efficiency
-	users, _, err := h.UserRepo.List(c.Context(), 0, 10000, search, tenantSlug)
+	users, _, _, err := h.UserRepo.List(c.Context(), 0, 10000, search, tenantSlug, "")
 	if err != nil {
 		return errorJSON(c, fiber.StatusInternalServerError, "failed to fetch users for export")
 	}

backend/internal/repository/tenant_repository.go

@@ -20,7 +20,7 @@ type TenantRepository interface {
 	FindByDomain(ctx context.Context, domainName string) (*domain.Tenant, error)
 	FindByIDs(ctx context.Context, ids []string) ([]domain.Tenant, error)
 	AddDomain(ctx context.Context, tenantID string, domainName string, verified bool) error
-	List(ctx context.Context, limit, offset int, parentID string) ([]domain.Tenant, int64, error)
+	List(ctx context.Context, limit, offset int, parentID string, search string) ([]domain.Tenant, int64, error)
 	ListByType(ctx context.Context, tenantType string) ([]domain.Tenant, error)
 	DeleteBulk(ctx context.Context, ids []string) error
 }
@@ -124,7 +124,7 @@ func (r *tenantRepository) AddDomain(ctx context.Context, tenantID string, domai
 	return r.db.WithContext(ctx).Create(&td).Error
 }
 
-func (r *tenantRepository) List(ctx context.Context, limit, offset int, parentID string) ([]domain.Tenant, int64, error) {
+func (r *tenantRepository) List(ctx context.Context, limit, offset int, parentID string, search string) ([]domain.Tenant, int64, error) {
 	var tenants []domain.Tenant
 	var total int64
 	db := r.db.WithContext(ctx).Model(&domain.Tenant{})
@@ -133,6 +133,11 @@ func (r *tenantRepository) List(ctx context.Context, limit, offset int, parentID
 		db = db.Where("parent_id = ?", parentID)
 	}
 
+	if search != "" {
+		searchTerm := "%" + strings.ToLower(search) + "%"
+		db = db.Where("LOWER(name) LIKE ? OR LOWER(slug) LIKE ? OR LOWER(description) LIKE ?", searchTerm, searchTerm, searchTerm)
+	}
+
 	if err := db.Count(&total).Error; err != nil {
 		return nil, 0, err
 	}

backend/internal/repository/user_repository.go

@@ -2,6 +2,7 @@ package repository
 
 import (
 	"baron-sso-backend/internal/domain"
+	"baron-sso-backend/internal/pagination"
 	"context"
 	"fmt"
 	"strings"
@@ -17,7 +18,7 @@ type UserRepository interface {
 	FindByID(ctx context.Context, id string) (*domain.User, error)
 	FindByIDs(ctx context.Context, ids []string) ([]domain.User, error)
 	ListByTenant(ctx context.Context, tenantID string) ([]domain.User, error)
-	List(ctx context.Context, offset, limit int, search string, tenantSlug string) ([]domain.User, int64, error)
+	List(ctx context.Context, offset, limit int, search string, tenantSlug string, cursor string) ([]domain.User, int64, string, error)
 	CountByTenant(ctx context.Context, tenantID string) (int64, error)
 	CountByTenantIDs(ctx context.Context, tenantIDs []string) (map[string]int64, error)
 	CountByCompanyCodes(ctx context.Context, codes []string) (map[string]int64, error)
@@ -215,7 +216,7 @@ func lowerStrings(arr []string) []string {
 	return res
 }
 
-func (r *userRepository) List(ctx context.Context, offset, limit int, search string, tenantSlug string) ([]domain.User, int64, error) {
+func (r *userRepository) List(ctx context.Context, offset, limit int, search string, tenantSlug string, cursorRaw string) ([]domain.User, int64, string, error) {
 	var users []domain.User
 	var total int64
 	db := r.db.WithContext(ctx).Model(&domain.User{})
@@ -232,14 +233,34 @@ func (r *userRepository) List(ctx context.Context, offset, limit int, search str
 	}
 
 	if err := db.Count(&total).Error; err != nil {
-		return nil, 0, err
+		return nil, 0, "", err
 	}
 
-	if err := db.Offset(offset).Limit(limit).Preload("Tenant").Find(&users).Error; err != nil {
+	if cursorRaw != "" {
-		return nil, 0, err
+		cursor, err := pagination.Decode(cursorRaw)
+		if err != nil {
+			return nil, 0, "", err
+		}
+		db = pagination.ApplyCreatedAtIDCursor(db, cursor, "created_at", "id")
+	} else {
+		db = db.Offset(offset)
 	}
 
-	return users, total, nil
+	if err := db.Order("created_at desc, id desc").Limit(limit + 1).Preload("Tenant").Find(&users).Error; err != nil {
+		return nil, 0, "", err
+	}
+
+	var items []domain.User
+	var nextCursor string
+	if len(users) > limit {
+		items = users[:limit]
+		last := items[limit-1]
+		nextCursor = pagination.Encode(last.CreatedAt, last.ID)
+	} else {
+		items = users
+	}
+
+	return items, total, nextCursor, nil
 }
 
 func (r *userRepository) Delete(ctx context.Context, id string) error {

backend/internal/service/tenant_service.go

@@ -18,7 +18,7 @@ type TenantService interface {
 	GetTenantByDomain(ctx context.Context, emailDomain string) (*domain.Tenant, error)
 	GetTenantBySlug(ctx context.Context, slug string) (*domain.Tenant, error)
 	GetTenant(ctx context.Context, id string) (*domain.Tenant, error)
-	ListTenants(ctx context.Context, limit, offset int, parentID string) ([]domain.Tenant, int64, error)
+	ListTenants(ctx context.Context, limit, offset int, parentID string, search string) ([]domain.Tenant, int64, error)
 	ListManageableTenants(ctx context.Context, userID string) ([]domain.Tenant, error)
 	ListJoinedTenants(ctx context.Context, userID string) ([]domain.Tenant, error)
 	IsDomainAllowed(ctx context.Context, domainName string) (bool, error)
@@ -314,8 +314,8 @@ func (s *tenantService) GetTenantBySlug(ctx context.Context, slug string) (*doma
 	return s.repo.FindBySlug(ctx, slug)
 }
 
-func (s *tenantService) ListTenants(ctx context.Context, limit, offset int, parentID string) ([]domain.Tenant, int64, error) {
+func (s *tenantService) ListTenants(ctx context.Context, limit, offset int, parentID string, search string) ([]domain.Tenant, int64, error) {
-	return s.repo.List(ctx, limit, offset, parentID)
+	return s.repo.List(ctx, limit, offset, parentID, search)
 }
 
 func (s *tenantService) IsDomainAllowed(ctx context.Context, domainName string) (bool, error) {

backend/internal/service/worksmobile_sync_service.go

@@ -938,7 +938,7 @@ func (s *worksmobileSyncService) hanmacRoot(ctx context.Context, tenantID string
 }
 
 func (s *worksmobileSyncService) hanmacSubtree(ctx context.Context, rootID string) ([]domain.Tenant, error) {
-	all, _, err := s.tenantService.ListTenants(ctx, 10000, 0, "")
+	all, _, err := s.tenantService.ListTenants(ctx, 10000, 0, "", "")
 	if err != nil {
 		return nil, err
 	}

tenant_mh_manager.csv

@@ -0,0 +1,2 @@
+tenant_id,name,type,slug
+4d0f26b9-702c-4bc6-8996-46e9eedfdeb7,mh-manager,COMPANY,mhd-tdc

test_users_bulk_comprehensive.csv

@@ -0,0 +1,5 @@
+uuid,email,name,phone,role,tenant_slug,department,grade,position,jobTitle,employee_id
+550e8400-e29b-41d4-a716-446655441001,user-unchanged@example.com,동일 테스트,010-1111-1001,user,test-tenant,Platform,Senior,,Engineer,E1001
+550e8400-e29b-41d4-a716-446655441002,user-modified@example.com,이름수정 완료,010-1111-1002,user,test-tenant,Design,Junior,,Designer,E1002
+550e8400-e29b-41d4-a716-446655441003,user-restored@example.com,복구 테스트,010-1111-1003,user,test-tenant,Sales,Manager,,Manager,E1003
+550e8400-e29b-41d4-a716-446655441005,user-brand-new@example.com,완전신규 테스트,010-1111-1005,user,test-tenant,R&D,Senior,,Lead,E1005

test_users_bulk_final_check.csv

@@ -0,0 +1,5 @@
+uuid,email,name,phone,role,tenant_slug,department,grade,position,jobTitle,employee_id
+550e8400-e29b-41d4-a716-446655440010,clean-user@example.com,Clean User,010-3333-0001,user,test-tenant,R&D,Senior,,Engineer,E010
+550e8400-e29b-41d4-a716-446655440010,conflict-user@example.com,Conflict User,010-3333-0002,user,test-tenant,Sales,,,E011
+550e8400-e29b-41d4-a716-446655440012,same-person@example.com,Same Person,010-3333-0003,user,test-tenant,HR,,,E012
+550e8400-e29b-41d4-a716-446655440013,reclaim-id@example.com,Reclaim ID User,010-3333-0004,user,test-tenant,Finance,,,E010

test_users_bulk_reimport_fix.csv

@@ -0,0 +1,5 @@
+uuid,email,name,phone,role,tenant_slug,department,grade,position,jobTitle,employee_id
+550e8400-e29b-41d4-a716-446655440001,uuid-user-1@example.com,UUID User 1 (Re-import),010-1111-0001,user,test-tenant,Platform,Senior,Lead,Engineer,E001
+550e8400-e29b-41d4-a716-446655440002,uuid-user-2@example.com,UUID User 2 (Re-import),010-1111-0002,user,test-tenant,Design,Junior,,Designer,E002
+550e8400-e29b-41d4-a716-446655440008,new-reimport-user@example.com,New Re-import User,010-1111-0008,user,test-tenant,HR,Manager,,HR,E008
+550e8400-e29b-41d4-a716-446655440009,conflict-uuid@example.com,Conflict UUID User,010-1111-0009,user,test-tenant,Sales,,,E001

test_users_bulk_uuid.csv

@@ -0,0 +1,5 @@
+uuid,email,name,phone,role,tenant_slug,department,grade,position,jobTitle,employee_id
+550e8400-e29b-41d4-a716-446655440001,uuid-user-1@example.com,UUID User 1,010-1111-0001,user,test-tenant,Platform,Senior,Lead,Engineer,E001
+550e8400-e29b-41d4-a716-446655440002,uuid-user-2@example.com,UUID User 2,010-1111-0002,user,test-tenant,Design,Junior,,Designer,E002
+,no-uuid-user@example.com,No UUID User,010-1111-0003,user,test-tenant,Sales,Manager,Head,,E003
+550e8400-e29b-41d4-a716-446655440004,id-column-uuid@example.com,ID Col UUID User,010-2222-0001,user,test-tenant

test_users_bulk_with_n_secondary_emails.csv

@@ -0,0 +1,4 @@
+email,secondary_emails,name,phone,role,tenant_slug,department,grade,position,jobTitle,employee_id,tenant_slug1,department1,grade1,position1,jobTitle1,employee_id1
+alice@hanmac.com,alice.personal@gmail.com;alice.sub@naver.com;alice.old@hanmac.co.kr,Alice Kim,010-1111-2222,user,hanmac-family,개발팀,선임,팀원,프론트엔드,EMP100,,,,,,
+bob@hanmac.com,,Bob Lee,010-3333-4444,user,hanmac-family,디자인팀,책임,팀장,UI/UX,EMP101,,,,,,
+charlie@hanmac.com,charlie.backup1@test.com;charlie.backup2@test.com;charlie.backup3@test.com;charlie.backup4@test.com;charlie.backup5@test.com,Charlie Park,010-5555-6666,user,hanmac-family,인사팀,수석,,HR,EMP102,,,,,,