Admin Dashboard mit Statistiken: Tierärzte-Anzahl, Gesamtproben und Proben pro Tierarzt

backend/src/main/java/de/svencarstensen/muh/service/AdminStatisticsService.java

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+package de.svencarstensen.muh.service;
+
+import de.svencarstensen.muh.domain.AppUser;
+import de.svencarstensen.muh.domain.Sample;
+import de.svencarstensen.muh.domain.UserRole;
+import de.svencarstensen.muh.repository.AppUserRepository;
+import de.svencarstensen.muh.repository.SampleRepository;
+import de.svencarstensen.muh.web.dto.AdminStatistics;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class AdminStatisticsService {
+
+    private final AppUserRepository appUserRepository;
+    private final SampleRepository sampleRepository;
+
+    public AdminStatisticsService(AppUserRepository appUserRepository, SampleRepository sampleRepository) {
+        this.appUserRepository = appUserRepository;
+        this.sampleRepository = sampleRepository;
+    }
+
+    public AdminStatistics getStatistics() {
+        // Alle Hauptnutzer (Tierärzte) laden - primaryUser=true und role=CUSTOMER
+        List<AppUser> vets = appUserRepository.findAll().stream()
+                .filter(u -> Boolean.TRUE.equals(u.primaryUser()))
+                .filter(u -> u.role() == UserRole.CUSTOMER)
+                .toList();
+
+        // Alle Proben laden
+        List<Sample> allSamples = sampleRepository.findAll();
+
+        // Proben pro Tierarzt zählen (basierend auf createdByUserCode)
+        List<AdminStatistics.VetSampleStats> samplesPerVet = vets.stream()
+                .map(vet -> {
+                    long sampleCount = allSamples.stream()
+                            .filter(s -> vet.id().equals(s.createdByUserCode()))
+                            .count();
+                    return new AdminStatistics.VetSampleStats(
+                            vet.id(),
+                            vet.displayName(),
+                            vet.companyName(),
+                            sampleCount
+                    );
+                })
+                .filter(s -> s.sampleCount() > 0)
+                .sorted((a, b) -> Long.compare(b.sampleCount(), a.sampleCount()))
+                .toList();
+
+        return new AdminStatistics(
+                vets.size(),
+                allSamples.size(),
+                samplesPerVet
+        );
+    }
+}

backend/src/main/java/de/svencarstensen/muh/web/AdminController.java

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+package de.svencarstensen.muh.web;
+
+import de.svencarstensen.muh.service.AdminStatisticsService;
+import de.svencarstensen.muh.web.dto.AdminStatistics;
+import org.springframework.security.access.prepost.PreAuthorize;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api/admin")
+@PreAuthorize("hasRole('ADMIN')")
+public class AdminController {
+
+    private final AdminStatisticsService adminStatisticsService;
+
+    public AdminController(AdminStatisticsService adminStatisticsService) {
+        this.adminStatisticsService = adminStatisticsService;
+    }
+
+    @GetMapping("/statistics")
+    public AdminStatistics getStatistics() {
+        return adminStatisticsService.getStatistics();
+    }
+}

backend/src/main/java/de/svencarstensen/muh/web/dto/AdminStatistics.java

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+package de.svencarstensen.muh.web.dto;
+
+import java.util.List;
+
+public record AdminStatistics(
+        long totalVets,
+        long totalSamples,
+        List<VetSampleStats> samplesPerVet
+) {
+    public record VetSampleStats(
+            String userId,
+            String displayName,
+            String companyName,
+            long sampleCount
+    ) {
+    }
+}