diff --git a/backend/src/main/java/com/petshop/backend/controller/AuthController.java b/backend/src/main/java/com/petshop/backend/controller/AuthController.java
index 641c7a6b..c237f27e 100644
--- a/backend/src/main/java/com/petshop/backend/controller/AuthController.java
+++ b/backend/src/main/java/com/petshop/backend/controller/AuthController.java
@@ -25,6 +25,7 @@ import org.springframework.security.authentication.InternalAuthenticationService
 import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.multipart.MultipartFile;
 
@@ -130,6 +131,7 @@ public class AuthController {
         }
     }
 
+    @Transactional(readOnly = true)
     @GetMapping("/me")
     public ResponseEntity<UserInfoResponse> getCurrentUser() {
         User user = getAuthenticatedUser();
diff --git a/backend/src/main/java/com/petshop/backend/entity/Service.java b/backend/src/main/java/com/petshop/backend/entity/Service.java
index 77223922..6b6c4267 100644
--- a/backend/src/main/java/com/petshop/backend/entity/Service.java
+++ b/backend/src/main/java/com/petshop/backend/entity/Service.java
@@ -30,7 +30,7 @@ public class Service {
     @Column(nullable = false)
     private Integer serviceDuration;
 
-    @ElementCollection
+    @ElementCollection(fetch = FetchType.EAGER)
     @CollectionTable(name = "service_species", joinColumns = @JoinColumn(name = "serviceId"))
     @Column(name = "species", length = 50)
     private Set<String> species = new HashSet<>();
diff --git a/backend/src/main/java/com/petshop/backend/service/RefundService.java b/backend/src/main/java/com/petshop/backend/service/RefundService.java
index 6d3ef880..49cc2f69 100644
--- a/backend/src/main/java/com/petshop/backend/service/RefundService.java
+++ b/backend/src/main/java/com/petshop/backend/service/RefundService.java
@@ -81,6 +81,7 @@ public class RefundService {
         return toResponse(savedRefund);
     }
 
+    @Transactional(readOnly = true)
     public RefundResponse getRefundById(Long id, Long customerId) {
         Refund refund = refundRepository.findById(id)
                 .orElseThrow(() -> new RuntimeException("Refund not found"));
@@ -92,6 +93,7 @@ public class RefundService {
         return toResponse(refund);
     }
 
+    @Transactional(readOnly = true)
     public List<RefundResponse> getAllRefunds(Long customerId) {
         List<Refund> refunds;
 
diff --git a/backend/src/main/java/com/petshop/backend/service/ServiceService.java b/backend/src/main/java/com/petshop/backend/service/ServiceService.java
index e2395392..65166f44 100644
--- a/backend/src/main/java/com/petshop/backend/service/ServiceService.java
+++ b/backend/src/main/java/com/petshop/backend/service/ServiceService.java
@@ -19,6 +19,7 @@ public class ServiceService {
         this.serviceRepository = serviceRepository;
     }
 
+    @Transactional(readOnly = true)
     public Page<ServiceResponse> getAllServices(String query, Pageable pageable) {
         Page<com.petshop.backend.entity.Service> services;
         if (query != null && !query.trim().isEmpty()) {
@@ -29,6 +30,7 @@ public class ServiceService {
         return services.map(this::mapToResponse);
     }
 
+    @Transactional(readOnly = true)
     public ServiceResponse getServiceById(Long id) {
         com.petshop.backend.entity.Service service = serviceRepository.findById(id)
                 .orElseThrow(() -> new ResourceNotFoundException("Service not found with id: " + id));