General: Fix school names filter for CIT

src/main/java/de/tum/cit/aet/usermanagement/repository/DepartmentRepository.java

@@ -44,7 +44,7 @@ default Department findByIdElseThrow(UUID departmentId) {
                    LOWER(s.name) LIKE LOWER(CONCAT('%', :searchQuery, '%')) OR
                    LOWER(s.abbreviation) LIKE LOWER(CONCAT('%', :searchQuery, '%'))
             )
-            AND (:schoolNames IS NULL OR s.name IN :schoolNames)
+            AND (:schoolNames IS NULL OR LOWER(s.name) IN :schoolNames)
         """
     )
     Page<DepartmentDTO> findAllForAdmin(

src/main/java/de/tum/cit/aet/usermanagement/service/DepartmentService.java

@@ -14,6 +14,8 @@
 import de.tum.cit.aet.usermanagement.dto.DepartmentDTO;
 import de.tum.cit.aet.usermanagement.repository.DepartmentRepository;
 import de.tum.cit.aet.usermanagement.repository.SchoolRepository;
+import jakarta.servlet.http.HttpServletRequest;
+import java.util.Arrays;
 import java.util.List;
 import java.util.UUID;
 import lombok.RequiredArgsConstructor;
@@ -92,9 +94,19 @@ public List<DepartmentDTO> getDepartmentsBySchoolId(UUID schoolId) {
      * @param pageDTO the paging parameters
      * @param filterDTO the filter parameters (searchQuery, schoolNames)
      * @param sortDTO the sorting parameters
+     * @param request the HTTP servlet request to extract schoolNames
      * @return a paged response of DepartmentDTOs
      */
-    public PageResponseDTO<DepartmentDTO> getDepartmentsForAdmin(PageDTO pageDTO, AdminDepartmentFilterDTO filterDTO, SortDTO sortDTO) {
+    public PageResponseDTO<DepartmentDTO> getDepartmentsForAdmin(
+        PageDTO pageDTO,
+        AdminDepartmentFilterDTO filterDTO,
+        SortDTO sortDTO,
+        HttpServletRequest request
+    ) {
+        String[] schoolNames = request.getParameterValues("schoolNames");
+        if (schoolNames != null) {
+            filterDTO.setSchoolNames(Arrays.asList(schoolNames));
+        }
         PageRequest pageable = PageUtil.createPageRequest(pageDTO, sortDTO, PageUtil.ColumnMapping.DEPARTMENTS_ADMIN, true);
         String normalizedSearch = StringUtil.normalizeSearchQuery(filterDTO.getSearchQuery());
 

src/main/java/de/tum/cit/aet/usermanagement/web/DepartmentResource.java

@@ -9,6 +9,7 @@
 import de.tum.cit.aet.usermanagement.dto.DepartmentCreationDTO;
 import de.tum.cit.aet.usermanagement.dto.DepartmentDTO;
 import de.tum.cit.aet.usermanagement.service.DepartmentService;
+import jakarta.servlet.http.HttpServletRequest;
 import jakarta.validation.Valid;
 import java.util.List;
 import java.util.UUID;
@@ -70,22 +71,24 @@ public ResponseEntity<List<DepartmentDTO>> getDepartments(@RequestParam(required
      * @param pageDTO paging params
      * @param filterDTO filter params (searchQuery, schoolNames)
      * @param sortDTO sorting params
+     * @param request HTTP servlet request to extract parameters
      * @return paginated departments
      */
     @Admin
     @GetMapping("/admin/search")
     public ResponseEntity<PageResponseDTO<DepartmentDTO>> getDepartmentsForAdmin(
         @ParameterObject @Valid @ModelAttribute PageDTO pageDTO,
         @ParameterObject @Valid @ModelAttribute AdminDepartmentFilterDTO filterDTO,
-        @ParameterObject @Valid @ModelAttribute SortDTO sortDTO
+        @ParameterObject @Valid @ModelAttribute SortDTO sortDTO,
+        HttpServletRequest request
     ) {
         log.info(
             "GET /api/departments/admin/search - Fetching departments for admin with page={}, filter={}, sort={}",
             pageDTO,
             filterDTO,
             sortDTO
         );
-        PageResponseDTO<DepartmentDTO> response = departmentService.getDepartmentsForAdmin(pageDTO, filterDTO, sortDTO);
+        PageResponseDTO<DepartmentDTO> response = departmentService.getDepartmentsForAdmin(pageDTO, filterDTO, sortDTO, request);
         return ResponseEntity.ok(response);
     }