Restore complete implementations

src/main/java/com/petshop/backend/config/DataInitializer.java

@@ -7,12 +7,16 @@ import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.stereotype.Component;
 
 @Component
-
 public class DataInitializer implements CommandLineRunner {
 
     private final UserRepository userRepository;
     private final PasswordEncoder passwordEncoder;
 
+    public DataInitializer(UserRepository userRepository, PasswordEncoder passwordEncoder) {
+        this.userRepository = userRepository;
+        this.passwordEncoder = passwordEncoder;
+    }
+
     @Override
     public void run(String... args) {
         if (userRepository.findByUsername("admin").isEmpty()) {

src/main/java/com/petshop/backend/controller/AdoptionController.java

@@ -13,11 +13,14 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/adoptions")
-
 public class AdoptionController {
 
     private final AdoptionService adoptionService;
 
+    public AdoptionController(AdoptionService adoptionService) {
+        this.adoptionService = adoptionService;
+    }
+
     @GetMapping
     public ResponseEntity<Page<AdoptionResponse>> getAllAdoptions(Pageable pageable) {
         return ResponseEntity.ok(adoptionService.getAllAdoptions(pageable));

src/main/java/com/petshop/backend/controller/AppointmentController.java

@@ -13,11 +13,14 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/appointments")
-
 public class AppointmentController {
 
     private final AppointmentService appointmentService;
 
+    public AppointmentController(AppointmentService appointmentService) {
+        this.appointmentService = appointmentService;
+    }
+
     @GetMapping
     public ResponseEntity<Page<AppointmentResponse>> getAllAppointments(Pageable pageable) {
         return ResponseEntity.ok(appointmentService.getAllAppointments(pageable));

src/main/java/com/petshop/backend/controller/AuthController.java

@@ -23,13 +23,18 @@ import java.util.Map;
 
 @RestController
 @RequestMapping("/api/v1/auth")
-
 public class AuthController {
 
     private final AuthenticationManager authenticationManager;
     private final UserRepository userRepository;
     private final JwtUtil jwtUtil;
 
+    public AuthController(AuthenticationManager authenticationManager, UserRepository userRepository, JwtUtil jwtUtil) {
+        this.authenticationManager = authenticationManager;
+        this.userRepository = userRepository;
+        this.jwtUtil = jwtUtil;
+    }
+
     @PostMapping("/login")
     public ResponseEntity<?> login(@Valid @RequestBody LoginRequest request) {
         try {

src/main/java/com/petshop/backend/controller/CategoryController.java

@@ -13,11 +13,14 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/categories")
-
 public class CategoryController {
 
     private final CategoryService categoryService;
 
+    public CategoryController(CategoryService categoryService) {
+        this.categoryService = categoryService;
+    }
+
     @GetMapping
     public ResponseEntity<Page<CategoryResponse>> getAllCategories(
             @RequestParam(required = false) String q,

src/main/java/com/petshop/backend/controller/CustomerController.java

@@ -13,11 +13,14 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/customers")
-
 public class CustomerController {
 
     private final CustomerService customerService;
 
+    public CustomerController(CustomerService customerService) {
+        this.customerService = customerService;
+    }
+
     @GetMapping
     public ResponseEntity<Page<CustomerResponse>> getAllCustomers(
             @RequestParam(required = false) String q,

src/main/java/com/petshop/backend/controller/DropdownController.java

@@ -13,7 +13,6 @@ import java.util.stream.Collectors;
 
 @RestController
 @RequestMapping("/api/v1/dropdowns")
-
 public class DropdownController {
 
     private final PetRepository petRepository;
@@ -24,6 +23,19 @@ public class DropdownController {
     private final StoreRepository storeRepository;
     private final SupplierRepository supplierRepository;
 
+    public DropdownController(PetRepository petRepository, CustomerRepository customerRepository,
+                             ServiceRepository serviceRepository, ProductRepository productRepository,
+                             CategoryRepository categoryRepository, StoreRepository storeRepository,
+                             SupplierRepository supplierRepository) {
+        this.petRepository = petRepository;
+        this.customerRepository = customerRepository;
+        this.serviceRepository = serviceRepository;
+        this.productRepository = productRepository;
+        this.categoryRepository = categoryRepository;
+        this.storeRepository = storeRepository;
+        this.supplierRepository = supplierRepository;
+    }
+
     @GetMapping("/pets")
     public ResponseEntity<List<DropdownOption>> getPets() {
         return ResponseEntity.ok(

src/main/java/com/petshop/backend/controller/InventoryController.java

@@ -14,12 +14,15 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/inventory")
-
 @PreAuthorize("hasRole('ADMIN')")
 public class InventoryController {
 
     private final InventoryService inventoryService;
 
+    public InventoryController(InventoryService inventoryService) {
+        this.inventoryService = inventoryService;
+    }
+
     @GetMapping
     public ResponseEntity<Page<InventoryResponse>> getAllInventory(Pageable pageable) {
         return ResponseEntity.ok(inventoryService.getAllInventory(pageable));

src/main/java/com/petshop/backend/controller/PetController.java

@@ -13,11 +13,14 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/pets")
-
 public class PetController {
 
     private final PetService petService;
 
+    public PetController(PetService petService) {
+        this.petService = petService;
+    }
+
     @GetMapping
     public ResponseEntity<Page<PetResponse>> getAllPets(
             @RequestParam(required = false) String q,

src/main/java/com/petshop/backend/controller/ProductController.java

@@ -13,11 +13,14 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/products")
-
 public class ProductController {
 
     private final ProductService productService;
 
+    public ProductController(ProductService productService) {
+        this.productService = productService;
+    }
+
     @GetMapping
     public ResponseEntity<Page<ProductResponse>> getAllProducts(
             @RequestParam(required = false) String q,

src/main/java/com/petshop/backend/controller/ProductSupplierController.java

@@ -14,12 +14,15 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/product-suppliers")
-
 @PreAuthorize("hasRole('ADMIN')")
 public class ProductSupplierController {
 
     private final ProductSupplierService productSupplierService;
 
+    public ProductSupplierController(ProductSupplierService productSupplierService) {
+        this.productSupplierService = productSupplierService;
+    }
+
     @GetMapping
     public ResponseEntity<Page<ProductSupplierResponse>> getAllProductSuppliers(Pageable pageable) {
         return ResponseEntity.ok(productSupplierService.getAllProductSuppliers(pageable));

src/main/java/com/petshop/backend/controller/PurchaseOrderController.java

@@ -10,12 +10,15 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/purchase-orders")
-
 @PreAuthorize("hasRole('ADMIN')")
 public class PurchaseOrderController {
 
     private final PurchaseOrderService purchaseOrderService;
 
+    public PurchaseOrderController(PurchaseOrderService purchaseOrderService) {
+        this.purchaseOrderService = purchaseOrderService;
+    }
+
     @GetMapping
     public ResponseEntity<Page<PurchaseOrderResponse>> getAllPurchaseOrders(Pageable pageable) {
         return ResponseEntity.ok(purchaseOrderService.getAllPurchaseOrders(pageable));

src/main/java/com/petshop/backend/controller/RefundController.java

@@ -10,11 +10,14 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/sales")
-
 public class RefundController {
 
     private final RefundService refundService;
 
+    public RefundController(RefundService refundService) {
+        this.refundService = refundService;
+    }
+
     @PostMapping("/{saleId}/refunds")
     public ResponseEntity<RefundResponse> createRefund(
             @PathVariable Long saleId,

src/main/java/com/petshop/backend/controller/SaleController.java

@@ -12,11 +12,14 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/sales")
-
 public class SaleController {
 
     private final SaleService saleService;
 
+    public SaleController(SaleService saleService) {
+        this.saleService = saleService;
+    }
+
     @GetMapping
     public ResponseEntity<Page<SaleResponse>> getAllSales(Pageable pageable) {
         return ResponseEntity.ok(saleService.getAllSales(pageable));

src/main/java/com/petshop/backend/controller/ServiceController.java

@@ -13,11 +13,14 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/services")
-
 public class ServiceController {
 
     private final ServiceService serviceService;
 
+    public ServiceController(ServiceService serviceService) {
+        this.serviceService = serviceService;
+    }
+
     @GetMapping
     public ResponseEntity<Page<ServiceResponse>> getAllServices(
             @RequestParam(required = false) String q,

src/main/java/com/petshop/backend/controller/SupplierController.java

@@ -14,12 +14,15 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/suppliers")
-
 @PreAuthorize("hasRole('ADMIN')")
 public class SupplierController {
 
     private final SupplierService supplierService;
 
+    public SupplierController(SupplierService supplierService) {
+        this.supplierService = supplierService;
+    }
+
     @GetMapping
     public ResponseEntity<Page<SupplierResponse>> getAllSuppliers(
             @RequestParam(required = false) String q,

src/main/java/com/petshop/backend/controller/UserController.java

@@ -14,12 +14,15 @@ import org.springframework.web.bind.annotation.*;
 
 @RestController
 @RequestMapping("/api/v1/users")
-
 @PreAuthorize("hasRole('ADMIN')")
 public class UserController {
 
     private final UserService userService;
 
+    public UserController(UserService userService) {
+        this.userService = userService;
+    }
+
     @GetMapping
     public ResponseEntity<Page<UserResponse>> getAllUsers(Pageable pageable) {
         return ResponseEntity.ok(userService.getAllUsers(pageable));

src/main/java/com/petshop/backend/dto/adoption/AdoptionRequest.java

@@ -2,10 +2,9 @@ package com.petshop.backend.dto.adoption;
 
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Positive;
-
 import java.math.BigDecimal;
 import java.time.LocalDate;
-
+import java.util.Objects;
 
 public class AdoptionRequest {
     @NotNull(message = "Pet ID is required")
@@ -22,4 +21,72 @@ public class AdoptionRequest {
     private BigDecimal adoptionFee;
 
     private String notes;
+
+    public Long getPetId() {
+        return petId;
+    }
+
+    public void setPetId(Long petId) {
+        this.petId = petId;
+    }
+
+    public Long getCustomerId() {
+        return customerId;
+    }
+
+    public void setCustomerId(Long customerId) {
+        this.customerId = customerId;
+    }
+
+    public LocalDate getAdoptionDate() {
+        return adoptionDate;
+    }
+
+    public void setAdoptionDate(LocalDate adoptionDate) {
+        this.adoptionDate = adoptionDate;
+    }
+
+    public BigDecimal getAdoptionFee() {
+        return adoptionFee;
+    }
+
+    public void setAdoptionFee(BigDecimal adoptionFee) {
+        this.adoptionFee = adoptionFee;
+    }
+
+    public String getNotes() {
+        return notes;
+    }
+
+    public void setNotes(String notes) {
+        this.notes = notes;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        AdoptionRequest that = (AdoptionRequest) o;
+        return Objects.equals(petId, that.petId) &&
+                Objects.equals(customerId, that.customerId) &&
+                Objects.equals(adoptionDate, that.adoptionDate) &&
+                Objects.equals(adoptionFee, that.adoptionFee) &&
+                Objects.equals(notes, that.notes);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(petId, customerId, adoptionDate, adoptionFee, notes);
+    }
+
+    @Override
+    public String toString() {
+        return "AdoptionRequest{" +
+                "petId=" + petId +
+                ", customerId=" + customerId +
+                ", adoptionDate=" + adoptionDate +
+                ", adoptionFee=" + adoptionFee +
+                ", notes='" + notes + '\'' +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/adoption/AdoptionResponse.java

@@ -1,12 +1,9 @@
 package com.petshop.backend.dto.adoption;
 
-
 import java.math.BigDecimal;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
-
-
-
+import java.util.Objects;
 
 public class AdoptionResponse {
     private Long id;
@@ -19,4 +16,129 @@ public class AdoptionResponse {
     private String notes;
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
+
+    public AdoptionResponse() {
+    }
+
+    public AdoptionResponse(Long id, Long petId, String petName, Long customerId, String customerName, LocalDate adoptionDate, BigDecimal adoptionFee, String notes, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.petId = petId;
+        this.petName = petName;
+        this.customerId = customerId;
+        this.customerName = customerName;
+        this.adoptionDate = adoptionDate;
+        this.adoptionFee = adoptionFee;
+        this.notes = notes;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getPetId() {
+        return petId;
+    }
+
+    public void setPetId(Long petId) {
+        this.petId = petId;
+    }
+
+    public String getPetName() {
+        return petName;
+    }
+
+    public void setPetName(String petName) {
+        this.petName = petName;
+    }
+
+    public Long getCustomerId() {
+        return customerId;
+    }
+
+    public void setCustomerId(Long customerId) {
+        this.customerId = customerId;
+    }
+
+    public String getCustomerName() {
+        return customerName;
+    }
+
+    public void setCustomerName(String customerName) {
+        this.customerName = customerName;
+    }
+
+    public LocalDate getAdoptionDate() {
+        return adoptionDate;
+    }
+
+    public void setAdoptionDate(LocalDate adoptionDate) {
+        this.adoptionDate = adoptionDate;
+    }
+
+    public BigDecimal getAdoptionFee() {
+        return adoptionFee;
+    }
+
+    public void setAdoptionFee(BigDecimal adoptionFee) {
+        this.adoptionFee = adoptionFee;
+    }
+
+    public String getNotes() {
+        return notes;
+    }
+
+    public void setNotes(String notes) {
+        this.notes = notes;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        AdoptionResponse that = (AdoptionResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(petId, that.petId) && Objects.equals(petName, that.petName) && Objects.equals(customerId, that.customerId) && Objects.equals(customerName, that.customerName) && Objects.equals(adoptionDate, that.adoptionDate) && Objects.equals(adoptionFee, that.adoptionFee) && Objects.equals(notes, that.notes) && Objects.equals(createdAt, that.createdAt) && Objects.equals(updatedAt, that.updatedAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, petId, petName, customerId, customerName, adoptionDate, adoptionFee, notes, createdAt, updatedAt);
+    }
+
+    @Override
+    public String toString() {
+        return "AdoptionResponse{" +
+                "id=" + id +
+                ", petId=" + petId +
+                ", petName='" + petName + '\'' +
+                ", customerId=" + customerId +
+                ", customerName='" + customerName + '\'' +
+                ", adoptionDate=" + adoptionDate +
+                ", adoptionFee=" + adoptionFee +
+                ", notes='" + notes + '\'' +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/analytics/DashboardResponse.java

@@ -1,54 +1,343 @@
 package com.petshop.backend.dto.analytics;
 
-
 import java.math.BigDecimal;
 import java.util.List;
-import java.util.Map;
-
-
-
+import java.util.Objects;
 
 public class DashboardResponse {
     private SalesSummary salesSummary;
     private InventorySummary inventorySummary;
     private List<TopProduct> topProducts;
     private List<DailySales> dailySales;
+
+    public DashboardResponse() {
+    }
+
+    public DashboardResponse(SalesSummary salesSummary, InventorySummary inventorySummary, List<TopProduct> topProducts, List<DailySales> dailySales) {
+        this.salesSummary = salesSummary;
+        this.inventorySummary = inventorySummary;
+        this.topProducts = topProducts;
+        this.dailySales = dailySales;
+    }
+
+    public SalesSummary getSalesSummary() {
+        return salesSummary;
+    }
+
+    public void setSalesSummary(SalesSummary salesSummary) {
+        this.salesSummary = salesSummary;
+    }
+
+    public InventorySummary getInventorySummary() {
+        return inventorySummary;
+    }
+
+    public void setInventorySummary(InventorySummary inventorySummary) {
+        this.inventorySummary = inventorySummary;
+    }
+
+    public List<TopProduct> getTopProducts() {
+        return topProducts;
+    }
+
+    public void setTopProducts(List<TopProduct> topProducts) {
+        this.topProducts = topProducts;
+    }
+
+    public List<DailySales> getDailySales() {
+        return dailySales;
+    }
+
+    public void setDailySales(List<DailySales> dailySales) {
+        this.dailySales = dailySales;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        DashboardResponse that = (DashboardResponse) o;
+        return Objects.equals(salesSummary, that.salesSummary) && Objects.equals(inventorySummary, that.inventorySummary) && Objects.equals(topProducts, that.topProducts) && Objects.equals(dailySales, that.dailySales);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(salesSummary, inventorySummary, topProducts, dailySales);
+    }
+
+    @Override
+    public String toString() {
+        return "DashboardResponse{" +
+                "salesSummary=" + salesSummary +
+                ", inventorySummary=" + inventorySummary +
+                ", topProducts=" + topProducts +
+                ", dailySales=" + dailySales +
+                '}';
+    }
 }
 
-
-
-
 class SalesSummary {
     private BigDecimal totalRevenue;
     private Long totalSales;
     private BigDecimal totalRefunds;
     private Long totalRefundCount;
+
+    public SalesSummary() {
+    }
+
+    public SalesSummary(BigDecimal totalRevenue, Long totalSales, BigDecimal totalRefunds, Long totalRefundCount) {
+        this.totalRevenue = totalRevenue;
+        this.totalSales = totalSales;
+        this.totalRefunds = totalRefunds;
+        this.totalRefundCount = totalRefundCount;
+    }
+
+    public BigDecimal getTotalRevenue() {
+        return totalRevenue;
+    }
+
+    public void setTotalRevenue(BigDecimal totalRevenue) {
+        this.totalRevenue = totalRevenue;
+    }
+
+    public Long getTotalSales() {
+        return totalSales;
+    }
+
+    public void setTotalSales(Long totalSales) {
+        this.totalSales = totalSales;
+    }
+
+    public BigDecimal getTotalRefunds() {
+        return totalRefunds;
+    }
+
+    public void setTotalRefunds(BigDecimal totalRefunds) {
+        this.totalRefunds = totalRefunds;
+    }
+
+    public Long getTotalRefundCount() {
+        return totalRefundCount;
+    }
+
+    public void setTotalRefundCount(Long totalRefundCount) {
+        this.totalRefundCount = totalRefundCount;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        SalesSummary that = (SalesSummary) o;
+        return Objects.equals(totalRevenue, that.totalRevenue) && Objects.equals(totalSales, that.totalSales) && Objects.equals(totalRefunds, that.totalRefunds) && Objects.equals(totalRefundCount, that.totalRefundCount);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(totalRevenue, totalSales, totalRefunds, totalRefundCount);
+    }
+
+    @Override
+    public String toString() {
+        return "SalesSummary{" +
+                "totalRevenue=" + totalRevenue +
+                ", totalSales=" + totalSales +
+                ", totalRefunds=" + totalRefunds +
+                ", totalRefundCount=" + totalRefundCount +
+                '}';
+    }
 }
 
-
-
-
 class InventorySummary {
     private Long totalProducts;
     private Long lowStockProducts;
     private Long outOfStockProducts;
+
+    public InventorySummary() {
+    }
+
+    public InventorySummary(Long totalProducts, Long lowStockProducts, Long outOfStockProducts) {
+        this.totalProducts = totalProducts;
+        this.lowStockProducts = lowStockProducts;
+        this.outOfStockProducts = outOfStockProducts;
+    }
+
+    public Long getTotalProducts() {
+        return totalProducts;
+    }
+
+    public void setTotalProducts(Long totalProducts) {
+        this.totalProducts = totalProducts;
+    }
+
+    public Long getLowStockProducts() {
+        return lowStockProducts;
+    }
+
+    public void setLowStockProducts(Long lowStockProducts) {
+        this.lowStockProducts = lowStockProducts;
+    }
+
+    public Long getOutOfStockProducts() {
+        return outOfStockProducts;
+    }
+
+    public void setOutOfStockProducts(Long outOfStockProducts) {
+        this.outOfStockProducts = outOfStockProducts;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        InventorySummary that = (InventorySummary) o;
+        return Objects.equals(totalProducts, that.totalProducts) && Objects.equals(lowStockProducts, that.lowStockProducts) && Objects.equals(outOfStockProducts, that.outOfStockProducts);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(totalProducts, lowStockProducts, outOfStockProducts);
+    }
+
+    @Override
+    public String toString() {
+        return "InventorySummary{" +
+                "totalProducts=" + totalProducts +
+                ", lowStockProducts=" + lowStockProducts +
+                ", outOfStockProducts=" + outOfStockProducts +
+                '}';
+    }
 }
 
-
-
-
 class TopProduct {
     private Long productId;
     private String productName;
     private Long quantitySold;
     private BigDecimal revenue;
+
+    public TopProduct() {
+    }
+
+    public TopProduct(Long productId, String productName, Long quantitySold, BigDecimal revenue) {
+        this.productId = productId;
+        this.productName = productName;
+        this.quantitySold = quantitySold;
+        this.revenue = revenue;
+    }
+
+    public Long getProductId() {
+        return productId;
+    }
+
+    public void setProductId(Long productId) {
+        this.productId = productId;
+    }
+
+    public String getProductName() {
+        return productName;
+    }
+
+    public void setProductName(String productName) {
+        this.productName = productName;
+    }
+
+    public Long getQuantitySold() {
+        return quantitySold;
+    }
+
+    public void setQuantitySold(Long quantitySold) {
+        this.quantitySold = quantitySold;
+    }
+
+    public BigDecimal getRevenue() {
+        return revenue;
+    }
+
+    public void setRevenue(BigDecimal revenue) {
+        this.revenue = revenue;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        TopProduct that = (TopProduct) o;
+        return Objects.equals(productId, that.productId) && Objects.equals(productName, that.productName) && Objects.equals(quantitySold, that.quantitySold) && Objects.equals(revenue, that.revenue);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(productId, productName, quantitySold, revenue);
+    }
+
+    @Override
+    public String toString() {
+        return "TopProduct{" +
+                "productId=" + productId +
+                ", productName='" + productName + '\'' +
+                ", quantitySold=" + quantitySold +
+                ", revenue=" + revenue +
+                '}';
+    }
 }
 
-
-
-
 class DailySales {
     private String date;
     private BigDecimal revenue;
     private Long salesCount;
+
+    public DailySales() {
+    }
+
+    public DailySales(String date, BigDecimal revenue, Long salesCount) {
+        this.date = date;
+        this.revenue = revenue;
+        this.salesCount = salesCount;
+    }
+
+    public String getDate() {
+        return date;
+    }
+
+    public void setDate(String date) {
+        this.date = date;
+    }
+
+    public BigDecimal getRevenue() {
+        return revenue;
+    }
+
+    public void setRevenue(BigDecimal revenue) {
+        this.revenue = revenue;
+    }
+
+    public Long getSalesCount() {
+        return salesCount;
+    }
+
+    public void setSalesCount(Long salesCount) {
+        this.salesCount = salesCount;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        DailySales that = (DailySales) o;
+        return Objects.equals(date, that.date) && Objects.equals(revenue, that.revenue) && Objects.equals(salesCount, that.salesCount);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(date, revenue, salesCount);
+    }
+
+    @Override
+    public String toString() {
+        return "DailySales{" +
+                "date='" + date + '\'' +
+                ", revenue=" + revenue +
+                ", salesCount=" + salesCount +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/appointment/AppointmentRequest.java

@@ -3,11 +3,10 @@ package com.petshop.backend.dto.appointment;
 import com.petshop.backend.entity.Appointment;
 import jakarta.validation.constraints.NotEmpty;
 import jakarta.validation.constraints.NotNull;
-
 import java.time.LocalDate;
 import java.time.LocalTime;
 import java.util.List;
-
+import java.util.Objects;
 
 public class AppointmentRequest {
     @NotNull(message = "Customer ID is required")
@@ -29,4 +28,92 @@ public class AppointmentRequest {
     private List<Long> petIds;
 
     private String notes;
+
+    public Long getCustomerId() {
+        return customerId;
+    }
+
+    public void setCustomerId(Long customerId) {
+        this.customerId = customerId;
+    }
+
+    public Long getServiceId() {
+        return serviceId;
+    }
+
+    public void setServiceId(Long serviceId) {
+        this.serviceId = serviceId;
+    }
+
+    public LocalDate getAppointmentDate() {
+        return appointmentDate;
+    }
+
+    public void setAppointmentDate(LocalDate appointmentDate) {
+        this.appointmentDate = appointmentDate;
+    }
+
+    public LocalTime getAppointmentTime() {
+        return appointmentTime;
+    }
+
+    public void setAppointmentTime(LocalTime appointmentTime) {
+        this.appointmentTime = appointmentTime;
+    }
+
+    public Appointment.AppointmentStatus getStatus() {
+        return status;
+    }
+
+    public void setStatus(Appointment.AppointmentStatus status) {
+        this.status = status;
+    }
+
+    public List<Long> getPetIds() {
+        return petIds;
+    }
+
+    public void setPetIds(List<Long> petIds) {
+        this.petIds = petIds;
+    }
+
+    public String getNotes() {
+        return notes;
+    }
+
+    public void setNotes(String notes) {
+        this.notes = notes;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        AppointmentRequest that = (AppointmentRequest) o;
+        return Objects.equals(customerId, that.customerId) &&
+                Objects.equals(serviceId, that.serviceId) &&
+                Objects.equals(appointmentDate, that.appointmentDate) &&
+                Objects.equals(appointmentTime, that.appointmentTime) &&
+                status == that.status &&
+                Objects.equals(petIds, that.petIds) &&
+                Objects.equals(notes, that.notes);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(customerId, serviceId, appointmentDate, appointmentTime, status, petIds, notes);
+    }
+
+    @Override
+    public String toString() {
+        return "AppointmentRequest{" +
+                "customerId=" + customerId +
+                ", serviceId=" + serviceId +
+                ", appointmentDate=" + appointmentDate +
+                ", appointmentTime=" + appointmentTime +
+                ", status=" + status +
+                ", petIds=" + petIds +
+                ", notes='" + notes + '\'' +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/appointment/AppointmentResponse.java

@@ -1,13 +1,10 @@
 package com.petshop.backend.dto.appointment;
 
-
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.time.LocalTime;
 import java.util.List;
-
-
-
+import java.util.Objects;
 
 public class AppointmentResponse {
     private Long id;
@@ -23,4 +20,159 @@ public class AppointmentResponse {
     private String notes;
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
+
+    public AppointmentResponse() {
+    }
+
+    public AppointmentResponse(Long id, Long customerId, String customerName, Long serviceId, String serviceName, LocalDate appointmentDate, LocalTime appointmentTime, String status, List<String> petNames, List<Long> petIds, String notes, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.customerId = customerId;
+        this.customerName = customerName;
+        this.serviceId = serviceId;
+        this.serviceName = serviceName;
+        this.appointmentDate = appointmentDate;
+        this.appointmentTime = appointmentTime;
+        this.status = status;
+        this.petNames = petNames;
+        this.petIds = petIds;
+        this.notes = notes;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getCustomerId() {
+        return customerId;
+    }
+
+    public void setCustomerId(Long customerId) {
+        this.customerId = customerId;
+    }
+
+    public String getCustomerName() {
+        return customerName;
+    }
+
+    public void setCustomerName(String customerName) {
+        this.customerName = customerName;
+    }
+
+    public Long getServiceId() {
+        return serviceId;
+    }
+
+    public void setServiceId(Long serviceId) {
+        this.serviceId = serviceId;
+    }
+
+    public String getServiceName() {
+        return serviceName;
+    }
+
+    public void setServiceName(String serviceName) {
+        this.serviceName = serviceName;
+    }
+
+    public LocalDate getAppointmentDate() {
+        return appointmentDate;
+    }
+
+    public void setAppointmentDate(LocalDate appointmentDate) {
+        this.appointmentDate = appointmentDate;
+    }
+
+    public LocalTime getAppointmentTime() {
+        return appointmentTime;
+    }
+
+    public void setAppointmentTime(LocalTime appointmentTime) {
+        this.appointmentTime = appointmentTime;
+    }
+
+    public String getStatus() {
+        return status;
+    }
+
+    public void setStatus(String status) {
+        this.status = status;
+    }
+
+    public List<String> getPetNames() {
+        return petNames;
+    }
+
+    public void setPetNames(List<String> petNames) {
+        this.petNames = petNames;
+    }
+
+    public List<Long> getPetIds() {
+        return petIds;
+    }
+
+    public void setPetIds(List<Long> petIds) {
+        this.petIds = petIds;
+    }
+
+    public String getNotes() {
+        return notes;
+    }
+
+    public void setNotes(String notes) {
+        this.notes = notes;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        AppointmentResponse that = (AppointmentResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(customerId, that.customerId) && Objects.equals(customerName, that.customerName) && Objects.equals(serviceId, that.serviceId) && Objects.equals(serviceName, that.serviceName) && Objects.equals(appointmentDate, that.appointmentDate) && Objects.equals(appointmentTime, that.appointmentTime) && Objects.equals(status, that.status) && Objects.equals(petNames, that.petNames) && Objects.equals(petIds, that.petIds) && Objects.equals(notes, that.notes) && Objects.equals(createdAt, that.createdAt) && Objects.equals(updatedAt, that.updatedAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, customerId, customerName, serviceId, serviceName, appointmentDate, appointmentTime, status, petNames, petIds, notes, createdAt, updatedAt);
+    }
+
+    @Override
+    public String toString() {
+        return "AppointmentResponse{" +
+                "id=" + id +
+                ", customerId=" + customerId +
+                ", customerName='" + customerName + '\'' +
+                ", serviceId=" + serviceId +
+                ", serviceName='" + serviceName + '\'' +
+                ", appointmentDate=" + appointmentDate +
+                ", appointmentTime=" + appointmentTime +
+                ", status='" + status + '\'' +
+                ", petNames=" + petNames +
+                ", petIds=" + petIds +
+                ", notes='" + notes + '\'' +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/auth/LoginRequest.java

@@ -1,7 +1,7 @@
 package com.petshop.backend.dto.auth;
 
 import jakarta.validation.constraints.NotBlank;
-
+import java.util.Objects;
 
 public class LoginRequest {
     @NotBlank(message = "Username is required")
@@ -9,4 +9,42 @@ public class LoginRequest {
 
     @NotBlank(message = "Password is required")
     private String password;
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        LoginRequest that = (LoginRequest) o;
+        return Objects.equals(username, that.username) &&
+                Objects.equals(password, that.password);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(username, password);
+    }
+
+    @Override
+    public String toString() {
+        return "LoginRequest{" +
+                "username='" + username + '\'' +
+                ", password='" + password + '\'' +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/auth/LoginResponse.java

@@ -1,11 +1,75 @@
 package com.petshop.backend.dto.auth;
 
-
-
+import java.util.Objects;
 
 public class LoginResponse {
     private String token;
     private String username;
     private String fullName;
     private String role;
+
+    public LoginResponse() {
+    }
+
+    public LoginResponse(String token, String username, String fullName, String role) {
+        this.token = token;
+        this.username = username;
+        this.fullName = fullName;
+        this.role = role;
+    }
+
+    public String getToken() {
+        return token;
+    }
+
+    public void setToken(String token) {
+        this.token = token;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getFullName() {
+        return fullName;
+    }
+
+    public void setFullName(String fullName) {
+        this.fullName = fullName;
+    }
+
+    public String getRole() {
+        return role;
+    }
+
+    public void setRole(String role) {
+        this.role = role;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        LoginResponse that = (LoginResponse) o;
+        return Objects.equals(token, that.token) && Objects.equals(username, that.username) && Objects.equals(fullName, that.fullName) && Objects.equals(role, that.role);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(token, username, fullName, role);
+    }
+
+    @Override
+    public String toString() {
+        return "LoginResponse{" +
+                "token='" + token + '\'' +
+                ", username='" + username + '\'' +
+                ", fullName='" + fullName + '\'' +
+                ", role='" + role + '\'' +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/auth/UserInfoResponse.java

@@ -1,7 +1,6 @@
 package com.petshop.backend.dto.auth;
 
-
-
+import java.util.Objects;
 
 public class UserInfoResponse {
     private Long id;
@@ -9,4 +8,79 @@ public class UserInfoResponse {
     private String fullName;
     private String email;
     private String role;
+
+    public UserInfoResponse() {
+    }
+
+    public UserInfoResponse(Long id, String username, String fullName, String email, String role) {
+        this.id = id;
+        this.username = username;
+        this.fullName = fullName;
+        this.email = email;
+        this.role = role;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getFullName() {
+        return fullName;
+    }
+
+    public void setFullName(String fullName) {
+        this.fullName = fullName;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public String getRole() {
+        return role;
+    }
+
+    public void setRole(String role) {
+        this.role = role;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        UserInfoResponse that = (UserInfoResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(username, that.username) && Objects.equals(fullName, that.fullName) && Objects.equals(email, that.email) && Objects.equals(role, that.role);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, username, fullName, email, role);
+    }
+
+    @Override
+    public String toString() {
+        return "UserInfoResponse{" +
+                "id=" + id +
+                ", username='" + username + '\'' +
+                ", fullName='" + fullName + '\'' +
+                ", email='" + email + '\'' +
+                ", role='" + role + '\'' +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/category/CategoryRequest.java

@@ -1,11 +1,49 @@
 package com.petshop.backend.dto.category;
 
 import jakarta.validation.constraints.NotBlank;
-
+import java.util.Objects;
 
 public class CategoryRequest {
     @NotBlank(message = "Category name is required")
     private String categoryName;
 
     private String categoryDescription;
+
+    public String getCategoryName() {
+        return categoryName;
+    }
+
+    public void setCategoryName(String categoryName) {
+        this.categoryName = categoryName;
+    }
+
+    public String getCategoryDescription() {
+        return categoryDescription;
+    }
+
+    public void setCategoryDescription(String categoryDescription) {
+        this.categoryDescription = categoryDescription;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        CategoryRequest that = (CategoryRequest) o;
+        return Objects.equals(categoryName, that.categoryName) &&
+                Objects.equals(categoryDescription, that.categoryDescription);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(categoryName, categoryDescription);
+    }
+
+    @Override
+    public String toString() {
+        return "CategoryRequest{" +
+                "categoryName='" + categoryName + '\'' +
+                ", categoryDescription='" + categoryDescription + '\'' +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/category/CategoryResponse.java

@@ -1,10 +1,7 @@
 package com.petshop.backend.dto.category;
 
-
 import java.time.LocalDateTime;
-
-
-
+import java.util.Objects;
 
 public class CategoryResponse {
     private Long id;
@@ -12,4 +9,79 @@ public class CategoryResponse {
     private String categoryDescription;
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
+
+    public CategoryResponse() {
+    }
+
+    public CategoryResponse(Long id, String categoryName, String categoryDescription, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.categoryName = categoryName;
+        this.categoryDescription = categoryDescription;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getCategoryName() {
+        return categoryName;
+    }
+
+    public void setCategoryName(String categoryName) {
+        this.categoryName = categoryName;
+    }
+
+    public String getCategoryDescription() {
+        return categoryDescription;
+    }
+
+    public void setCategoryDescription(String categoryDescription) {
+        this.categoryDescription = categoryDescription;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        CategoryResponse that = (CategoryResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(categoryName, that.categoryName) && Objects.equals(categoryDescription, that.categoryDescription) && Objects.equals(createdAt, that.createdAt) && Objects.equals(updatedAt, that.updatedAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, categoryName, categoryDescription, createdAt, updatedAt);
+    }
+
+    @Override
+    public String toString() {
+        return "CategoryResponse{" +
+                "id=" + id +
+                ", categoryName='" + categoryName + '\'' +
+                ", categoryDescription='" + categoryDescription + '\'' +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/common/BulkDeleteRequest.java

@@ -1,11 +1,38 @@
 package com.petshop.backend.dto.common;
 
 import jakarta.validation.constraints.NotEmpty;
-
 import java.util.List;
-
+import java.util.Objects;
 
 public class BulkDeleteRequest {
     @NotEmpty(message = "IDs list cannot be empty")
     private List<Long> ids;
+
+    public List<Long> getIds() {
+        return ids;
+    }
+
+    public void setIds(List<Long> ids) {
+        this.ids = ids;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        BulkDeleteRequest that = (BulkDeleteRequest) o;
+        return Objects.equals(ids, that.ids);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(ids);
+    }
+
+    @Override
+    public String toString() {
+        return "BulkDeleteRequest{" +
+                "ids=" + ids +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/common/DropdownOption.java

@@ -1,9 +1,53 @@
 package com.petshop.backend.dto.common;
 
-
-
+import java.util.Objects;
 
 public class DropdownOption {
     private Long id;
     private String label;
+
+    public DropdownOption() {
+    }
+
+    public DropdownOption(Long id, String label) {
+        this.id = id;
+        this.label = label;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getLabel() {
+        return label;
+    }
+
+    public void setLabel(String label) {
+        this.label = label;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        DropdownOption that = (DropdownOption) o;
+        return Objects.equals(id, that.id) && Objects.equals(label, that.label);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, label);
+    }
+
+    @Override
+    public String toString() {
+        return "DropdownOption{" +
+                "id=" + id +
+                ", label='" + label + '\'' +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/customer/CustomerRequest.java

@@ -2,7 +2,7 @@ package com.petshop.backend.dto.customer;
 
 import jakarta.validation.constraints.Email;
 import jakarta.validation.constraints.NotBlank;
-
+import java.util.Objects;
 
 public class CustomerRequest {
     @NotBlank(message = "Customer name is required")
@@ -13,4 +13,62 @@ public class CustomerRequest {
 
     private String customerPhone;
     private String customerAddress;
+
+    public String getCustomerName() {
+        return customerName;
+    }
+
+    public void setCustomerName(String customerName) {
+        this.customerName = customerName;
+    }
+
+    public String getCustomerEmail() {
+        return customerEmail;
+    }
+
+    public void setCustomerEmail(String customerEmail) {
+        this.customerEmail = customerEmail;
+    }
+
+    public String getCustomerPhone() {
+        return customerPhone;
+    }
+
+    public void setCustomerPhone(String customerPhone) {
+        this.customerPhone = customerPhone;
+    }
+
+    public String getCustomerAddress() {
+        return customerAddress;
+    }
+
+    public void setCustomerAddress(String customerAddress) {
+        this.customerAddress = customerAddress;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        CustomerRequest that = (CustomerRequest) o;
+        return Objects.equals(customerName, that.customerName) &&
+                Objects.equals(customerEmail, that.customerEmail) &&
+                Objects.equals(customerPhone, that.customerPhone) &&
+                Objects.equals(customerAddress, that.customerAddress);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(customerName, customerEmail, customerPhone, customerAddress);
+    }
+
+    @Override
+    public String toString() {
+        return "CustomerRequest{" +
+                "customerName='" + customerName + '\'' +
+                ", customerEmail='" + customerEmail + '\'' +
+                ", customerPhone='" + customerPhone + '\'' +
+                ", customerAddress='" + customerAddress + '\'' +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/customer/CustomerResponse.java

@@ -1,10 +1,7 @@
 package com.petshop.backend.dto.customer;
 
-
 import java.time.LocalDateTime;
-
-
-
+import java.util.Objects;
 
 public class CustomerResponse {
     private Long id;
@@ -14,4 +11,99 @@ public class CustomerResponse {
     private String customerAddress;
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
+
+    public CustomerResponse() {
+    }
+
+    public CustomerResponse(Long id, String customerName, String customerEmail, String customerPhone, String customerAddress, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.customerName = customerName;
+        this.customerEmail = customerEmail;
+        this.customerPhone = customerPhone;
+        this.customerAddress = customerAddress;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getCustomerName() {
+        return customerName;
+    }
+
+    public void setCustomerName(String customerName) {
+        this.customerName = customerName;
+    }
+
+    public String getCustomerEmail() {
+        return customerEmail;
+    }
+
+    public void setCustomerEmail(String customerEmail) {
+        this.customerEmail = customerEmail;
+    }
+
+    public String getCustomerPhone() {
+        return customerPhone;
+    }
+
+    public void setCustomerPhone(String customerPhone) {
+        this.customerPhone = customerPhone;
+    }
+
+    public String getCustomerAddress() {
+        return customerAddress;
+    }
+
+    public void setCustomerAddress(String customerAddress) {
+        this.customerAddress = customerAddress;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        CustomerResponse that = (CustomerResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(customerName, that.customerName) && Objects.equals(customerEmail, that.customerEmail) && Objects.equals(customerPhone, that.customerPhone) && Objects.equals(customerAddress, that.customerAddress) && Objects.equals(createdAt, that.createdAt) && Objects.equals(updatedAt, that.updatedAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, customerName, customerEmail, customerPhone, customerAddress, createdAt, updatedAt);
+    }
+
+    @Override
+    public String toString() {
+        return "CustomerResponse{" +
+                "id=" + id +
+                ", customerName='" + customerName + '\'' +
+                ", customerEmail='" + customerEmail + '\'' +
+                ", customerPhone='" + customerPhone + '\'' +
+                ", customerAddress='" + customerAddress + '\'' +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/inventory/InventoryRequest.java

@@ -2,7 +2,7 @@ package com.petshop.backend.dto.inventory;
 
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.PositiveOrZero;
-
+import java.util.Objects;
 
 public class InventoryRequest {
     @NotNull(message = "Product ID is required")
@@ -17,4 +17,62 @@ public class InventoryRequest {
 
     @PositiveOrZero(message = "Reorder level must be zero or positive")
     private Integer reorderLevel = 10;
+
+    public Long getProductId() {
+        return productId;
+    }
+
+    public void setProductId(Long productId) {
+        this.productId = productId;
+    }
+
+    public Long getStoreId() {
+        return storeId;
+    }
+
+    public void setStoreId(Long storeId) {
+        this.storeId = storeId;
+    }
+
+    public Integer getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(Integer quantity) {
+        this.quantity = quantity;
+    }
+
+    public Integer getReorderLevel() {
+        return reorderLevel;
+    }
+
+    public void setReorderLevel(Integer reorderLevel) {
+        this.reorderLevel = reorderLevel;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        InventoryRequest that = (InventoryRequest) o;
+        return Objects.equals(productId, that.productId) &&
+                Objects.equals(storeId, that.storeId) &&
+                Objects.equals(quantity, that.quantity) &&
+                Objects.equals(reorderLevel, that.reorderLevel);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(productId, storeId, quantity, reorderLevel);
+    }
+
+    @Override
+    public String toString() {
+        return "InventoryRequest{" +
+                "productId=" + productId +
+                ", storeId=" + storeId +
+                ", quantity=" + quantity +
+                ", reorderLevel=" + reorderLevel +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/inventory/InventoryResponse.java

@@ -1,10 +1,7 @@
 package com.petshop.backend.dto.inventory;
 
-
 import java.time.LocalDateTime;
-
-
-
+import java.util.Objects;
 
 public class InventoryResponse {
     private Long id;
@@ -18,4 +15,139 @@ public class InventoryResponse {
     private LocalDateTime lastRestocked;
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
+
+    public InventoryResponse() {
+    }
+
+    public InventoryResponse(Long id, Long productId, String productName, String categoryName, Long storeId, String storeName, Integer quantity, Integer reorderLevel, LocalDateTime lastRestocked, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.productId = productId;
+        this.productName = productName;
+        this.categoryName = categoryName;
+        this.storeId = storeId;
+        this.storeName = storeName;
+        this.quantity = quantity;
+        this.reorderLevel = reorderLevel;
+        this.lastRestocked = lastRestocked;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getProductId() {
+        return productId;
+    }
+
+    public void setProductId(Long productId) {
+        this.productId = productId;
+    }
+
+    public String getProductName() {
+        return productName;
+    }
+
+    public void setProductName(String productName) {
+        this.productName = productName;
+    }
+
+    public String getCategoryName() {
+        return categoryName;
+    }
+
+    public void setCategoryName(String categoryName) {
+        this.categoryName = categoryName;
+    }
+
+    public Long getStoreId() {
+        return storeId;
+    }
+
+    public void setStoreId(Long storeId) {
+        this.storeId = storeId;
+    }
+
+    public String getStoreName() {
+        return storeName;
+    }
+
+    public void setStoreName(String storeName) {
+        this.storeName = storeName;
+    }
+
+    public Integer getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(Integer quantity) {
+        this.quantity = quantity;
+    }
+
+    public Integer getReorderLevel() {
+        return reorderLevel;
+    }
+
+    public void setReorderLevel(Integer reorderLevel) {
+        this.reorderLevel = reorderLevel;
+    }
+
+    public LocalDateTime getLastRestocked() {
+        return lastRestocked;
+    }
+
+    public void setLastRestocked(LocalDateTime lastRestocked) {
+        this.lastRestocked = lastRestocked;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        InventoryResponse that = (InventoryResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(productId, that.productId) && Objects.equals(productName, that.productName) && Objects.equals(categoryName, that.categoryName) && Objects.equals(storeId, that.storeId) && Objects.equals(storeName, that.storeName) && Objects.equals(quantity, that.quantity) && Objects.equals(reorderLevel, that.reorderLevel) && Objects.equals(lastRestocked, that.lastRestocked) && Objects.equals(createdAt, that.createdAt) && Objects.equals(updatedAt, that.updatedAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, productId, productName, categoryName, storeId, storeName, quantity, reorderLevel, lastRestocked, createdAt, updatedAt);
+    }
+
+    @Override
+    public String toString() {
+        return "InventoryResponse{" +
+                "id=" + id +
+                ", productId=" + productId +
+                ", productName='" + productName + '\'' +
+                ", categoryName='" + categoryName + '\'' +
+                ", storeId=" + storeId +
+                ", storeName='" + storeName + '\'' +
+                ", quantity=" + quantity +
+                ", reorderLevel=" + reorderLevel +
+                ", lastRestocked=" + lastRestocked +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/pet/PetRequest.java

@@ -4,9 +4,8 @@ import com.petshop.backend.entity.Pet;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Positive;
-
 import java.math.BigDecimal;
-
+import java.util.Objects;
 
 public class PetRequest {
     @NotBlank(message = "Pet name is required")
@@ -24,4 +23,82 @@ public class PetRequest {
     private Pet.PetStatus petStatus;
 
     private BigDecimal petPrice;
+
+    public String getPetName() {
+        return petName;
+    }
+
+    public void setPetName(String petName) {
+        this.petName = petName;
+    }
+
+    public String getPetSpecies() {
+        return petSpecies;
+    }
+
+    public void setPetSpecies(String petSpecies) {
+        this.petSpecies = petSpecies;
+    }
+
+    public String getPetBreed() {
+        return petBreed;
+    }
+
+    public void setPetBreed(String petBreed) {
+        this.petBreed = petBreed;
+    }
+
+    public Integer getPetAge() {
+        return petAge;
+    }
+
+    public void setPetAge(Integer petAge) {
+        this.petAge = petAge;
+    }
+
+    public Pet.PetStatus getPetStatus() {
+        return petStatus;
+    }
+
+    public void setPetStatus(Pet.PetStatus petStatus) {
+        this.petStatus = petStatus;
+    }
+
+    public BigDecimal getPetPrice() {
+        return petPrice;
+    }
+
+    public void setPetPrice(BigDecimal petPrice) {
+        this.petPrice = petPrice;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        PetRequest that = (PetRequest) o;
+        return Objects.equals(petName, that.petName) &&
+                Objects.equals(petSpecies, that.petSpecies) &&
+                Objects.equals(petBreed, that.petBreed) &&
+                Objects.equals(petAge, that.petAge) &&
+                petStatus == that.petStatus &&
+                Objects.equals(petPrice, that.petPrice);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(petName, petSpecies, petBreed, petAge, petStatus, petPrice);
+    }
+
+    @Override
+    public String toString() {
+        return "PetRequest{" +
+                "petName='" + petName + '\'' +
+                ", petSpecies='" + petSpecies + '\'' +
+                ", petBreed='" + petBreed + '\'' +
+                ", petAge=" + petAge +
+                ", petStatus=" + petStatus +
+                ", petPrice=" + petPrice +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/pet/PetResponse.java

@@ -1,11 +1,8 @@
 package com.petshop.backend.dto.pet;
 
-
 import java.math.BigDecimal;
 import java.time.LocalDateTime;
-
-
-
+import java.util.Objects;
 
 public class PetResponse {
     private Long id;
@@ -17,4 +14,119 @@ public class PetResponse {
     private BigDecimal petPrice;
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
+
+    public PetResponse() {
+    }
+
+    public PetResponse(Long id, String petName, String petSpecies, String petBreed, Integer petAge, String petStatus, BigDecimal petPrice, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.petName = petName;
+        this.petSpecies = petSpecies;
+        this.petBreed = petBreed;
+        this.petAge = petAge;
+        this.petStatus = petStatus;
+        this.petPrice = petPrice;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getPetName() {
+        return petName;
+    }
+
+    public void setPetName(String petName) {
+        this.petName = petName;
+    }
+
+    public String getPetSpecies() {
+        return petSpecies;
+    }
+
+    public void setPetSpecies(String petSpecies) {
+        this.petSpecies = petSpecies;
+    }
+
+    public String getPetBreed() {
+        return petBreed;
+    }
+
+    public void setPetBreed(String petBreed) {
+        this.petBreed = petBreed;
+    }
+
+    public Integer getPetAge() {
+        return petAge;
+    }
+
+    public void setPetAge(Integer petAge) {
+        this.petAge = petAge;
+    }
+
+    public String getPetStatus() {
+        return petStatus;
+    }
+
+    public void setPetStatus(String petStatus) {
+        this.petStatus = petStatus;
+    }
+
+    public BigDecimal getPetPrice() {
+        return petPrice;
+    }
+
+    public void setPetPrice(BigDecimal petPrice) {
+        this.petPrice = petPrice;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        PetResponse that = (PetResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(petName, that.petName) && Objects.equals(petSpecies, that.petSpecies) && Objects.equals(petBreed, that.petBreed) && Objects.equals(petAge, that.petAge) && Objects.equals(petStatus, that.petStatus) && Objects.equals(petPrice, that.petPrice) && Objects.equals(createdAt, that.createdAt) && Objects.equals(updatedAt, that.updatedAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, petName, petSpecies, petBreed, petAge, petStatus, petPrice, createdAt, updatedAt);
+    }
+
+    @Override
+    public String toString() {
+        return "PetResponse{" +
+                "id=" + id +
+                ", petName='" + petName + '\'' +
+                ", petSpecies='" + petSpecies + '\'' +
+                ", petBreed='" + petBreed + '\'' +
+                ", petAge=" + petAge +
+                ", petStatus='" + petStatus + '\'' +
+                ", petPrice=" + petPrice +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/product/ProductRequest.java

@@ -3,9 +3,8 @@ package com.petshop.backend.dto.product;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Positive;
-
 import java.math.BigDecimal;
-
+import java.util.Objects;
 
 public class ProductRequest {
     @NotBlank(message = "Product name is required")
@@ -21,4 +20,72 @@ public class ProductRequest {
     private BigDecimal productPrice;
 
     private Boolean active = true;
+
+    public String getProductName() {
+        return productName;
+    }
+
+    public void setProductName(String productName) {
+        this.productName = productName;
+    }
+
+    public Long getCategoryId() {
+        return categoryId;
+    }
+
+    public void setCategoryId(Long categoryId) {
+        this.categoryId = categoryId;
+    }
+
+    public String getProductDescription() {
+        return productDescription;
+    }
+
+    public void setProductDescription(String productDescription) {
+        this.productDescription = productDescription;
+    }
+
+    public BigDecimal getProductPrice() {
+        return productPrice;
+    }
+
+    public void setProductPrice(BigDecimal productPrice) {
+        this.productPrice = productPrice;
+    }
+
+    public Boolean getActive() {
+        return active;
+    }
+
+    public void setActive(Boolean active) {
+        this.active = active;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ProductRequest that = (ProductRequest) o;
+        return Objects.equals(productName, that.productName) &&
+                Objects.equals(categoryId, that.categoryId) &&
+                Objects.equals(productDescription, that.productDescription) &&
+                Objects.equals(productPrice, that.productPrice) &&
+                Objects.equals(active, that.active);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(productName, categoryId, productDescription, productPrice, active);
+    }
+
+    @Override
+    public String toString() {
+        return "ProductRequest{" +
+                "productName='" + productName + '\'' +
+                ", categoryId=" + categoryId +
+                ", productDescription='" + productDescription + '\'' +
+                ", productPrice=" + productPrice +
+                ", active=" + active +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/product/ProductResponse.java

@@ -1,11 +1,8 @@
 package com.petshop.backend.dto.product;
 
-
 import java.math.BigDecimal;
 import java.time.LocalDateTime;
-
-
-
+import java.util.Objects;
 
 public class ProductResponse {
     private Long id;
@@ -17,4 +14,119 @@ public class ProductResponse {
     private Boolean active;
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
+
+    public ProductResponse() {
+    }
+
+    public ProductResponse(Long id, String productName, Long categoryId, String categoryName, String productDescription, BigDecimal productPrice, Boolean active, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.productName = productName;
+        this.categoryId = categoryId;
+        this.categoryName = categoryName;
+        this.productDescription = productDescription;
+        this.productPrice = productPrice;
+        this.active = active;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getProductName() {
+        return productName;
+    }
+
+    public void setProductName(String productName) {
+        this.productName = productName;
+    }
+
+    public Long getCategoryId() {
+        return categoryId;
+    }
+
+    public void setCategoryId(Long categoryId) {
+        this.categoryId = categoryId;
+    }
+
+    public String getCategoryName() {
+        return categoryName;
+    }
+
+    public void setCategoryName(String categoryName) {
+        this.categoryName = categoryName;
+    }
+
+    public String getProductDescription() {
+        return productDescription;
+    }
+
+    public void setProductDescription(String productDescription) {
+        this.productDescription = productDescription;
+    }
+
+    public BigDecimal getProductPrice() {
+        return productPrice;
+    }
+
+    public void setProductPrice(BigDecimal productPrice) {
+        this.productPrice = productPrice;
+    }
+
+    public Boolean getActive() {
+        return active;
+    }
+
+    public void setActive(Boolean active) {
+        this.active = active;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ProductResponse that = (ProductResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(productName, that.productName) && Objects.equals(categoryId, that.categoryId) && Objects.equals(categoryName, that.categoryName) && Objects.equals(productDescription, that.productDescription) && Objects.equals(productPrice, that.productPrice) && Objects.equals(active, that.active) && Objects.equals(createdAt, that.createdAt) && Objects.equals(updatedAt, that.updatedAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, productName, categoryId, categoryName, productDescription, productPrice, active, createdAt, updatedAt);
+    }
+
+    @Override
+    public String toString() {
+        return "ProductResponse{" +
+                "id=" + id +
+                ", productName='" + productName + '\'' +
+                ", categoryId=" + categoryId +
+                ", categoryName='" + categoryName + '\'' +
+                ", productDescription='" + productDescription + '\'' +
+                ", productPrice=" + productPrice +
+                ", active=" + active +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/productsupplier/BulkDeleteProductSupplierRequest.java

@@ -1,11 +1,38 @@
 package com.petshop.backend.dto.productsupplier;
 
 import jakarta.validation.constraints.NotEmpty;
-
 import java.util.List;
-
+import java.util.Objects;
 
 public class BulkDeleteProductSupplierRequest {
     @NotEmpty(message = "Keys list cannot be empty")
     private List<ProductSupplierKey> keys;
+
+    public List<ProductSupplierKey> getKeys() {
+        return keys;
+    }
+
+    public void setKeys(List<ProductSupplierKey> keys) {
+        this.keys = keys;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        BulkDeleteProductSupplierRequest that = (BulkDeleteProductSupplierRequest) o;
+        return Objects.equals(keys, that.keys);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(keys);
+    }
+
+    @Override
+    public String toString() {
+        return "BulkDeleteProductSupplierRequest{" +
+                "keys=" + keys +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/productsupplier/ProductSupplierKey.java

@@ -1,12 +1,54 @@
 package com.petshop.backend.dto.productsupplier;
 
-import jakarta.validation.constraints.NotEmpty;
-
-import java.util.List;
-
+import java.util.Objects;
 
 public class ProductSupplierKey {
     private Long productId;
     private Long supplierId;
+
+    public ProductSupplierKey() {
+    }
+
+    public ProductSupplierKey(Long productId, Long supplierId) {
+        this.productId = productId;
+        this.supplierId = supplierId;
+    }
+
+    public Long getProductId() {
+        return productId;
+    }
+
+    public void setProductId(Long productId) {
+        this.productId = productId;
+    }
+
+    public Long getSupplierId() {
+        return supplierId;
+    }
+
+    public void setSupplierId(Long supplierId) {
+        this.supplierId = supplierId;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ProductSupplierKey that = (ProductSupplierKey) o;
+        return Objects.equals(productId, that.productId) && Objects.equals(supplierId, that.supplierId);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(productId, supplierId);
+    }
+
+    @Override
+    public String toString() {
+        return "ProductSupplierKey{" +
+                "productId=" + productId +
+                ", supplierId=" + supplierId +
+                '}';
+    }
 }
 

src/main/java/com/petshop/backend/dto/productsupplier/ProductSupplierRequest.java

@@ -3,9 +3,8 @@ package com.petshop.backend.dto.productsupplier;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Positive;
 import jakarta.validation.constraints.PositiveOrZero;
-
 import java.math.BigDecimal;
-
+import java.util.Objects;
 
 public class ProductSupplierRequest {
     @NotNull(message = "Product ID is required")
@@ -22,4 +21,72 @@ public class ProductSupplierRequest {
     private Integer leadTimeDays;
 
     private Boolean isPreferred = false;
+
+    public Long getProductId() {
+        return productId;
+    }
+
+    public void setProductId(Long productId) {
+        this.productId = productId;
+    }
+
+    public Long getSupplierId() {
+        return supplierId;
+    }
+
+    public void setSupplierId(Long supplierId) {
+        this.supplierId = supplierId;
+    }
+
+    public BigDecimal getCostPrice() {
+        return costPrice;
+    }
+
+    public void setCostPrice(BigDecimal costPrice) {
+        this.costPrice = costPrice;
+    }
+
+    public Integer getLeadTimeDays() {
+        return leadTimeDays;
+    }
+
+    public void setLeadTimeDays(Integer leadTimeDays) {
+        this.leadTimeDays = leadTimeDays;
+    }
+
+    public Boolean getIsPreferred() {
+        return isPreferred;
+    }
+
+    public void setIsPreferred(Boolean isPreferred) {
+        this.isPreferred = isPreferred;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ProductSupplierRequest that = (ProductSupplierRequest) o;
+        return Objects.equals(productId, that.productId) &&
+                Objects.equals(supplierId, that.supplierId) &&
+                Objects.equals(costPrice, that.costPrice) &&
+                Objects.equals(leadTimeDays, that.leadTimeDays) &&
+                Objects.equals(isPreferred, that.isPreferred);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(productId, supplierId, costPrice, leadTimeDays, isPreferred);
+    }
+
+    @Override
+    public String toString() {
+        return "ProductSupplierRequest{" +
+                "productId=" + productId +
+                ", supplierId=" + supplierId +
+                ", costPrice=" + costPrice +
+                ", leadTimeDays=" + leadTimeDays +
+                ", isPreferred=" + isPreferred +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/productsupplier/ProductSupplierResponse.java

@@ -1,11 +1,8 @@
 package com.petshop.backend.dto.productsupplier;
 
-
 import java.math.BigDecimal;
 import java.time.LocalDateTime;
-
-
-
+import java.util.Objects;
 
 public class ProductSupplierResponse {
     private Long productId;
@@ -17,4 +14,119 @@ public class ProductSupplierResponse {
     private Boolean isPreferred;
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
+
+    public ProductSupplierResponse() {
+    }
+
+    public ProductSupplierResponse(Long productId, String productName, Long supplierId, String supplierName, BigDecimal costPrice, Integer leadTimeDays, Boolean isPreferred, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.productId = productId;
+        this.productName = productName;
+        this.supplierId = supplierId;
+        this.supplierName = supplierName;
+        this.costPrice = costPrice;
+        this.leadTimeDays = leadTimeDays;
+        this.isPreferred = isPreferred;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getProductId() {
+        return productId;
+    }
+
+    public void setProductId(Long productId) {
+        this.productId = productId;
+    }
+
+    public String getProductName() {
+        return productName;
+    }
+
+    public void setProductName(String productName) {
+        this.productName = productName;
+    }
+
+    public Long getSupplierId() {
+        return supplierId;
+    }
+
+    public void setSupplierId(Long supplierId) {
+        this.supplierId = supplierId;
+    }
+
+    public String getSupplierName() {
+        return supplierName;
+    }
+
+    public void setSupplierName(String supplierName) {
+        this.supplierName = supplierName;
+    }
+
+    public BigDecimal getCostPrice() {
+        return costPrice;
+    }
+
+    public void setCostPrice(BigDecimal costPrice) {
+        this.costPrice = costPrice;
+    }
+
+    public Integer getLeadTimeDays() {
+        return leadTimeDays;
+    }
+
+    public void setLeadTimeDays(Integer leadTimeDays) {
+        this.leadTimeDays = leadTimeDays;
+    }
+
+    public Boolean getIsPreferred() {
+        return isPreferred;
+    }
+
+    public void setIsPreferred(Boolean isPreferred) {
+        this.isPreferred = isPreferred;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ProductSupplierResponse that = (ProductSupplierResponse) o;
+        return Objects.equals(productId, that.productId) && Objects.equals(productName, that.productName) && Objects.equals(supplierId, that.supplierId) && Objects.equals(supplierName, that.supplierName) && Objects.equals(costPrice, that.costPrice) && Objects.equals(leadTimeDays, that.leadTimeDays) && Objects.equals(isPreferred, that.isPreferred) && Objects.equals(createdAt, that.createdAt) && Objects.equals(updatedAt, that.updatedAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(productId, productName, supplierId, supplierName, costPrice, leadTimeDays, isPreferred, createdAt, updatedAt);
+    }
+
+    @Override
+    public String toString() {
+        return "ProductSupplierResponse{" +
+                "productId=" + productId +
+                ", productName='" + productName + '\'' +
+                ", supplierId=" + supplierId +
+                ", supplierName='" + supplierName + '\'' +
+                ", costPrice=" + costPrice +
+                ", leadTimeDays=" + leadTimeDays +
+                ", isPreferred=" + isPreferred +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/purchaseorder/PurchaseOrderResponse.java

@@ -1,13 +1,10 @@
 package com.petshop.backend.dto.purchaseorder;
 
-
 import java.math.BigDecimal;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.util.List;
-
-
-
+import java.util.Objects;
 
 public class PurchaseOrderResponse {
     private Long id;
@@ -22,9 +19,141 @@ public class PurchaseOrderResponse {
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
 
-    
-    
-    
+    public PurchaseOrderResponse() {
+    }
+
+    public PurchaseOrderResponse(Long id, Long supplierId, String supplierName, LocalDate orderDate, LocalDate expectedDelivery, String status, BigDecimal totalAmount, String notes, List<PurchaseOrderItemResponse> items, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.supplierId = supplierId;
+        this.supplierName = supplierName;
+        this.orderDate = orderDate;
+        this.expectedDelivery = expectedDelivery;
+        this.status = status;
+        this.totalAmount = totalAmount;
+        this.notes = notes;
+        this.items = items;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getSupplierId() {
+        return supplierId;
+    }
+
+    public void setSupplierId(Long supplierId) {
+        this.supplierId = supplierId;
+    }
+
+    public String getSupplierName() {
+        return supplierName;
+    }
+
+    public void setSupplierName(String supplierName) {
+        this.supplierName = supplierName;
+    }
+
+    public LocalDate getOrderDate() {
+        return orderDate;
+    }
+
+    public void setOrderDate(LocalDate orderDate) {
+        this.orderDate = orderDate;
+    }
+
+    public LocalDate getExpectedDelivery() {
+        return expectedDelivery;
+    }
+
+    public void setExpectedDelivery(LocalDate expectedDelivery) {
+        this.expectedDelivery = expectedDelivery;
+    }
+
+    public String getStatus() {
+        return status;
+    }
+
+    public void setStatus(String status) {
+        this.status = status;
+    }
+
+    public BigDecimal getTotalAmount() {
+        return totalAmount;
+    }
+
+    public void setTotalAmount(BigDecimal totalAmount) {
+        this.totalAmount = totalAmount;
+    }
+
+    public String getNotes() {
+        return notes;
+    }
+
+    public void setNotes(String notes) {
+        this.notes = notes;
+    }
+
+    public List<PurchaseOrderItemResponse> getItems() {
+        return items;
+    }
+
+    public void setItems(List<PurchaseOrderItemResponse> items) {
+        this.items = items;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        PurchaseOrderResponse that = (PurchaseOrderResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(supplierId, that.supplierId) && Objects.equals(supplierName, that.supplierName) && Objects.equals(orderDate, that.orderDate) && Objects.equals(expectedDelivery, that.expectedDelivery) && Objects.equals(status, that.status) && Objects.equals(totalAmount, that.totalAmount) && Objects.equals(notes, that.notes) && Objects.equals(items, that.items) && Objects.equals(createdAt, that.createdAt) && Objects.equals(updatedAt, that.updatedAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, supplierId, supplierName, orderDate, expectedDelivery, status, totalAmount, notes, items, createdAt, updatedAt);
+    }
+
+    @Override
+    public String toString() {
+        return "PurchaseOrderResponse{" +
+                "id=" + id +
+                ", supplierId=" + supplierId +
+                ", supplierName='" + supplierName + '\'' +
+                ", orderDate=" + orderDate +
+                ", expectedDelivery=" + expectedDelivery +
+                ", status='" + status + '\'' +
+                ", totalAmount=" + totalAmount +
+                ", notes='" + notes + '\'' +
+                ", items=" + items +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
+
     public static class PurchaseOrderItemResponse {
         private Long id;
         private Long productId;
@@ -32,5 +161,90 @@ public class PurchaseOrderResponse {
         private Integer quantity;
         private BigDecimal unitCost;
         private BigDecimal subtotal;
+
+        public PurchaseOrderItemResponse() {
+        }
+
+        public PurchaseOrderItemResponse(Long id, Long productId, String productName, Integer quantity, BigDecimal unitCost, BigDecimal subtotal) {
+            this.id = id;
+            this.productId = productId;
+            this.productName = productName;
+            this.quantity = quantity;
+            this.unitCost = unitCost;
+            this.subtotal = subtotal;
+        }
+
+        public Long getId() {
+            return id;
+        }
+
+        public void setId(Long id) {
+            this.id = id;
+        }
+
+        public Long getProductId() {
+            return productId;
+        }
+
+        public void setProductId(Long productId) {
+            this.productId = productId;
+        }
+
+        public String getProductName() {
+            return productName;
+        }
+
+        public void setProductName(String productName) {
+            this.productName = productName;
+        }
+
+        public Integer getQuantity() {
+            return quantity;
+        }
+
+        public void setQuantity(Integer quantity) {
+            this.quantity = quantity;
+        }
+
+        public BigDecimal getUnitCost() {
+            return unitCost;
+        }
+
+        public void setUnitCost(BigDecimal unitCost) {
+            this.unitCost = unitCost;
+        }
+
+        public BigDecimal getSubtotal() {
+            return subtotal;
+        }
+
+        public void setSubtotal(BigDecimal subtotal) {
+            this.subtotal = subtotal;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            PurchaseOrderItemResponse that = (PurchaseOrderItemResponse) o;
+            return Objects.equals(id, that.id) && Objects.equals(productId, that.productId) && Objects.equals(productName, that.productName) && Objects.equals(quantity, that.quantity) && Objects.equals(unitCost, that.unitCost) && Objects.equals(subtotal, that.subtotal);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(id, productId, productName, quantity, unitCost, subtotal);
+        }
+
+        @Override
+        public String toString() {
+            return "PurchaseOrderItemResponse{" +
+                    "id=" + id +
+                    ", productId=" + productId +
+                    ", productName='" + productName + '\'' +
+                    ", quantity=" + quantity +
+                    ", unitCost=" + unitCost +
+                    ", subtotal=" + subtotal +
+                    '}';
+        }
     }
 }

src/main/java/com/petshop/backend/dto/refund/RefundItemRequest.java

@@ -2,7 +2,7 @@ package com.petshop.backend.dto.refund;
 
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Positive;
-
+import java.util.Objects;
 
 public class RefundItemRequest {
     @NotNull(message = "Sale item ID is required")
@@ -11,4 +11,42 @@ public class RefundItemRequest {
     @NotNull(message = "Quantity is required")
     @Positive(message = "Quantity must be positive")
     private Integer quantity;
+
+    public Long getSaleItemId() {
+        return saleItemId;
+    }
+
+    public void setSaleItemId(Long saleItemId) {
+        this.saleItemId = saleItemId;
+    }
+
+    public Integer getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(Integer quantity) {
+        this.quantity = quantity;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        RefundItemRequest that = (RefundItemRequest) o;
+        return Objects.equals(saleItemId, that.saleItemId) &&
+                Objects.equals(quantity, that.quantity);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(saleItemId, quantity);
+    }
+
+    @Override
+    public String toString() {
+        return "RefundItemRequest{" +
+                "saleItemId=" + saleItemId +
+                ", quantity=" + quantity +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/refund/RefundRequest.java

@@ -2,11 +2,8 @@ package com.petshop.backend.dto.refund;
 
 import jakarta.validation.Valid;
 import jakarta.validation.constraints.NotEmpty;
-import jakarta.validation.constraints.NotNull;
-import jakarta.validation.constraints.Positive;
-
 import java.util.List;
-
+import java.util.Objects;
 
 public class RefundRequest {
     @NotEmpty(message = "At least one item is required")
@@ -14,4 +11,42 @@ public class RefundRequest {
     private List<RefundItemRequest> items;
 
     private String refundReason;
+
+    public List<RefundItemRequest> getItems() {
+        return items;
+    }
+
+    public void setItems(List<RefundItemRequest> items) {
+        this.items = items;
+    }
+
+    public String getRefundReason() {
+        return refundReason;
+    }
+
+    public void setRefundReason(String refundReason) {
+        this.refundReason = refundReason;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        RefundRequest that = (RefundRequest) o;
+        return Objects.equals(items, that.items) &&
+                Objects.equals(refundReason, that.refundReason);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(items, refundReason);
+    }
+
+    @Override
+    public String toString() {
+        return "RefundRequest{" +
+                "items=" + items +
+                ", refundReason='" + refundReason + '\'' +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/refund/RefundResponse.java

@@ -1,12 +1,9 @@
 package com.petshop.backend.dto.refund;
 
-
 import java.math.BigDecimal;
 import java.time.LocalDateTime;
 import java.util.List;
-
-
-
+import java.util.Objects;
 
 public class RefundResponse {
     private Long id;
@@ -19,9 +16,121 @@ public class RefundResponse {
     private List<RefundItemResponse> items;
     private LocalDateTime createdAt;
 
-    
-    
-    
+    public RefundResponse() {
+    }
+
+    public RefundResponse(Long id, Long saleId, LocalDateTime refundDate, BigDecimal refundAmount, String refundReason, Long processedBy, String processedByName, List<RefundItemResponse> items, LocalDateTime createdAt) {
+        this.id = id;
+        this.saleId = saleId;
+        this.refundDate = refundDate;
+        this.refundAmount = refundAmount;
+        this.refundReason = refundReason;
+        this.processedBy = processedBy;
+        this.processedByName = processedByName;
+        this.items = items;
+        this.createdAt = createdAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getSaleId() {
+        return saleId;
+    }
+
+    public void setSaleId(Long saleId) {
+        this.saleId = saleId;
+    }
+
+    public LocalDateTime getRefundDate() {
+        return refundDate;
+    }
+
+    public void setRefundDate(LocalDateTime refundDate) {
+        this.refundDate = refundDate;
+    }
+
+    public BigDecimal getRefundAmount() {
+        return refundAmount;
+    }
+
+    public void setRefundAmount(BigDecimal refundAmount) {
+        this.refundAmount = refundAmount;
+    }
+
+    public String getRefundReason() {
+        return refundReason;
+    }
+
+    public void setRefundReason(String refundReason) {
+        this.refundReason = refundReason;
+    }
+
+    public Long getProcessedBy() {
+        return processedBy;
+    }
+
+    public void setProcessedBy(Long processedBy) {
+        this.processedBy = processedBy;
+    }
+
+    public String getProcessedByName() {
+        return processedByName;
+    }
+
+    public void setProcessedByName(String processedByName) {
+        this.processedByName = processedByName;
+    }
+
+    public List<RefundItemResponse> getItems() {
+        return items;
+    }
+
+    public void setItems(List<RefundItemResponse> items) {
+        this.items = items;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        RefundResponse that = (RefundResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(saleId, that.saleId) && Objects.equals(refundDate, that.refundDate) && Objects.equals(refundAmount, that.refundAmount) && Objects.equals(refundReason, that.refundReason) && Objects.equals(processedBy, that.processedBy) && Objects.equals(processedByName, that.processedByName) && Objects.equals(items, that.items) && Objects.equals(createdAt, that.createdAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, saleId, refundDate, refundAmount, refundReason, processedBy, processedByName, items, createdAt);
+    }
+
+    @Override
+    public String toString() {
+        return "RefundResponse{" +
+                "id=" + id +
+                ", saleId=" + saleId +
+                ", refundDate=" + refundDate +
+                ", refundAmount=" + refundAmount +
+                ", refundReason='" + refundReason + '\'' +
+                ", processedBy=" + processedBy +
+                ", processedByName='" + processedByName + '\'' +
+                ", items=" + items +
+                ", createdAt=" + createdAt +
+                '}';
+    }
+
     public static class RefundItemResponse {
         private Long id;
         private Long saleItemId;
@@ -29,5 +138,90 @@ public class RefundResponse {
         private String productName;
         private Integer quantity;
         private BigDecimal refundAmount;
+
+        public RefundItemResponse() {
+        }
+
+        public RefundItemResponse(Long id, Long saleItemId, Long productId, String productName, Integer quantity, BigDecimal refundAmount) {
+            this.id = id;
+            this.saleItemId = saleItemId;
+            this.productId = productId;
+            this.productName = productName;
+            this.quantity = quantity;
+            this.refundAmount = refundAmount;
+        }
+
+        public Long getId() {
+            return id;
+        }
+
+        public void setId(Long id) {
+            this.id = id;
+        }
+
+        public Long getSaleItemId() {
+            return saleItemId;
+        }
+
+        public void setSaleItemId(Long saleItemId) {
+            this.saleItemId = saleItemId;
+        }
+
+        public Long getProductId() {
+            return productId;
+        }
+
+        public void setProductId(Long productId) {
+            this.productId = productId;
+        }
+
+        public String getProductName() {
+            return productName;
+        }
+
+        public void setProductName(String productName) {
+            this.productName = productName;
+        }
+
+        public Integer getQuantity() {
+            return quantity;
+        }
+
+        public void setQuantity(Integer quantity) {
+            this.quantity = quantity;
+        }
+
+        public BigDecimal getRefundAmount() {
+            return refundAmount;
+        }
+
+        public void setRefundAmount(BigDecimal refundAmount) {
+            this.refundAmount = refundAmount;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            RefundItemResponse that = (RefundItemResponse) o;
+            return Objects.equals(id, that.id) && Objects.equals(saleItemId, that.saleItemId) && Objects.equals(productId, that.productId) && Objects.equals(productName, that.productName) && Objects.equals(quantity, that.quantity) && Objects.equals(refundAmount, that.refundAmount);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(id, saleItemId, productId, productName, quantity, refundAmount);
+        }
+
+        @Override
+        public String toString() {
+            return "RefundItemResponse{" +
+                    "id=" + id +
+                    ", saleItemId=" + saleItemId +
+                    ", productId=" + productId +
+                    ", productName='" + productName + '\'' +
+                    ", quantity=" + quantity +
+                    ", refundAmount=" + refundAmount +
+                    '}';
+        }
     }
 }

src/main/java/com/petshop/backend/dto/sale/SaleItemRequest.java

@@ -2,7 +2,7 @@ package com.petshop.backend.dto.sale;
 
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Positive;
-
+import java.util.Objects;
 
 public class SaleItemRequest {
     @NotNull(message = "Product ID is required")
@@ -11,4 +11,42 @@ public class SaleItemRequest {
     @NotNull(message = "Quantity is required")
     @Positive(message = "Quantity must be positive")
     private Integer quantity;
+
+    public Long getProductId() {
+        return productId;
+    }
+
+    public void setProductId(Long productId) {
+        this.productId = productId;
+    }
+
+    public Integer getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(Integer quantity) {
+        this.quantity = quantity;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        SaleItemRequest that = (SaleItemRequest) o;
+        return Objects.equals(productId, that.productId) &&
+                Objects.equals(quantity, that.quantity);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(productId, quantity);
+    }
+
+    @Override
+    public String toString() {
+        return "SaleItemRequest{" +
+                "productId=" + productId +
+                ", quantity=" + quantity +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/sale/SaleRequest.java

@@ -3,11 +3,9 @@ package com.petshop.backend.dto.sale;
 import jakarta.validation.Valid;
 import jakarta.validation.constraints.NotEmpty;
 import jakarta.validation.constraints.NotNull;
-import jakarta.validation.constraints.Positive;
-
 import java.math.BigDecimal;
 import java.util.List;
-
+import java.util.Objects;
 
 public class SaleRequest {
     private Long customerId;
@@ -24,4 +22,82 @@ public class SaleRequest {
     private List<SaleItemRequest> items;
 
     private String notes;
+
+    public Long getCustomerId() {
+        return customerId;
+    }
+
+    public void setCustomerId(Long customerId) {
+        this.customerId = customerId;
+    }
+
+    public Long getStoreId() {
+        return storeId;
+    }
+
+    public void setStoreId(Long storeId) {
+        this.storeId = storeId;
+    }
+
+    public String getPaymentMethod() {
+        return paymentMethod;
+    }
+
+    public void setPaymentMethod(String paymentMethod) {
+        this.paymentMethod = paymentMethod;
+    }
+
+    public BigDecimal getTax() {
+        return tax;
+    }
+
+    public void setTax(BigDecimal tax) {
+        this.tax = tax;
+    }
+
+    public List<SaleItemRequest> getItems() {
+        return items;
+    }
+
+    public void setItems(List<SaleItemRequest> items) {
+        this.items = items;
+    }
+
+    public String getNotes() {
+        return notes;
+    }
+
+    public void setNotes(String notes) {
+        this.notes = notes;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        SaleRequest that = (SaleRequest) o;
+        return Objects.equals(customerId, that.customerId) &&
+                Objects.equals(storeId, that.storeId) &&
+                Objects.equals(paymentMethod, that.paymentMethod) &&
+                Objects.equals(tax, that.tax) &&
+                Objects.equals(items, that.items) &&
+                Objects.equals(notes, that.notes);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(customerId, storeId, paymentMethod, tax, items, notes);
+    }
+
+    @Override
+    public String toString() {
+        return "SaleRequest{" +
+                "customerId=" + customerId +
+                ", storeId=" + storeId +
+                ", paymentMethod='" + paymentMethod + '\'' +
+                ", tax=" + tax +
+                ", items=" + items +
+                ", notes='" + notes + '\'' +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/sale/SaleResponse.java

@@ -1,12 +1,9 @@
 package com.petshop.backend.dto.sale;
 
-
 import java.math.BigDecimal;
 import java.time.LocalDateTime;
 import java.util.List;
-
-
-
+import java.util.Objects;
 
 public class SaleResponse {
     private Long id;
@@ -25,9 +22,181 @@ public class SaleResponse {
     private List<SaleItemResponse> items;
     private LocalDateTime createdAt;
 
-    
-    
-    
+    public SaleResponse() {
+    }
+
+    public SaleResponse(Long id, LocalDateTime saleDate, Long employeeId, String employeeName, Long customerId, String customerName, Long storeId, String storeName, BigDecimal subtotal, BigDecimal tax, BigDecimal total, String paymentMethod, String notes, List<SaleItemResponse> items, LocalDateTime createdAt) {
+        this.id = id;
+        this.saleDate = saleDate;
+        this.employeeId = employeeId;
+        this.employeeName = employeeName;
+        this.customerId = customerId;
+        this.customerName = customerName;
+        this.storeId = storeId;
+        this.storeName = storeName;
+        this.subtotal = subtotal;
+        this.tax = tax;
+        this.total = total;
+        this.paymentMethod = paymentMethod;
+        this.notes = notes;
+        this.items = items;
+        this.createdAt = createdAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public LocalDateTime getSaleDate() {
+        return saleDate;
+    }
+
+    public void setSaleDate(LocalDateTime saleDate) {
+        this.saleDate = saleDate;
+    }
+
+    public Long getEmployeeId() {
+        return employeeId;
+    }
+
+    public void setEmployeeId(Long employeeId) {
+        this.employeeId = employeeId;
+    }
+
+    public String getEmployeeName() {
+        return employeeName;
+    }
+
+    public void setEmployeeName(String employeeName) {
+        this.employeeName = employeeName;
+    }
+
+    public Long getCustomerId() {
+        return customerId;
+    }
+
+    public void setCustomerId(Long customerId) {
+        this.customerId = customerId;
+    }
+
+    public String getCustomerName() {
+        return customerName;
+    }
+
+    public void setCustomerName(String customerName) {
+        this.customerName = customerName;
+    }
+
+    public Long getStoreId() {
+        return storeId;
+    }
+
+    public void setStoreId(Long storeId) {
+        this.storeId = storeId;
+    }
+
+    public String getStoreName() {
+        return storeName;
+    }
+
+    public void setStoreName(String storeName) {
+        this.storeName = storeName;
+    }
+
+    public BigDecimal getSubtotal() {
+        return subtotal;
+    }
+
+    public void setSubtotal(BigDecimal subtotal) {
+        this.subtotal = subtotal;
+    }
+
+    public BigDecimal getTax() {
+        return tax;
+    }
+
+    public void setTax(BigDecimal tax) {
+        this.tax = tax;
+    }
+
+    public BigDecimal getTotal() {
+        return total;
+    }
+
+    public void setTotal(BigDecimal total) {
+        this.total = total;
+    }
+
+    public String getPaymentMethod() {
+        return paymentMethod;
+    }
+
+    public void setPaymentMethod(String paymentMethod) {
+        this.paymentMethod = paymentMethod;
+    }
+
+    public String getNotes() {
+        return notes;
+    }
+
+    public void setNotes(String notes) {
+        this.notes = notes;
+    }
+
+    public List<SaleItemResponse> getItems() {
+        return items;
+    }
+
+    public void setItems(List<SaleItemResponse> items) {
+        this.items = items;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        SaleResponse that = (SaleResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(saleDate, that.saleDate) && Objects.equals(employeeId, that.employeeId) && Objects.equals(employeeName, that.employeeName) && Objects.equals(customerId, that.customerId) && Objects.equals(customerName, that.customerName) && Objects.equals(storeId, that.storeId) && Objects.equals(storeName, that.storeName) && Objects.equals(subtotal, that.subtotal) && Objects.equals(tax, that.tax) && Objects.equals(total, that.total) && Objects.equals(paymentMethod, that.paymentMethod) && Objects.equals(notes, that.notes) && Objects.equals(items, that.items) && Objects.equals(createdAt, that.createdAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, saleDate, employeeId, employeeName, customerId, customerName, storeId, storeName, subtotal, tax, total, paymentMethod, notes, items, createdAt);
+    }
+
+    @Override
+    public String toString() {
+        return "SaleResponse{" +
+                "id=" + id +
+                ", saleDate=" + saleDate +
+                ", employeeId=" + employeeId +
+                ", employeeName='" + employeeName + '\'' +
+                ", customerId=" + customerId +
+                ", customerName='" + customerName + '\'' +
+                ", storeId=" + storeId +
+                ", storeName='" + storeName + '\'' +
+                ", subtotal=" + subtotal +
+                ", tax=" + tax +
+                ", total=" + total +
+                ", paymentMethod='" + paymentMethod + '\'' +
+                ", notes='" + notes + '\'' +
+                ", items=" + items +
+                ", createdAt=" + createdAt +
+                '}';
+    }
+
     public static class SaleItemResponse {
         private Long id;
         private Long productId;
@@ -35,5 +204,90 @@ public class SaleResponse {
         private Integer quantity;
         private BigDecimal unitPrice;
         private BigDecimal subtotal;
+
+        public SaleItemResponse() {
+        }
+
+        public SaleItemResponse(Long id, Long productId, String productName, Integer quantity, BigDecimal unitPrice, BigDecimal subtotal) {
+            this.id = id;
+            this.productId = productId;
+            this.productName = productName;
+            this.quantity = quantity;
+            this.unitPrice = unitPrice;
+            this.subtotal = subtotal;
+        }
+
+        public Long getId() {
+            return id;
+        }
+
+        public void setId(Long id) {
+            this.id = id;
+        }
+
+        public Long getProductId() {
+            return productId;
+        }
+
+        public void setProductId(Long productId) {
+            this.productId = productId;
+        }
+
+        public String getProductName() {
+            return productName;
+        }
+
+        public void setProductName(String productName) {
+            this.productName = productName;
+        }
+
+        public Integer getQuantity() {
+            return quantity;
+        }
+
+        public void setQuantity(Integer quantity) {
+            this.quantity = quantity;
+        }
+
+        public BigDecimal getUnitPrice() {
+            return unitPrice;
+        }
+
+        public void setUnitPrice(BigDecimal unitPrice) {
+            this.unitPrice = unitPrice;
+        }
+
+        public BigDecimal getSubtotal() {
+            return subtotal;
+        }
+
+        public void setSubtotal(BigDecimal subtotal) {
+            this.subtotal = subtotal;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            SaleItemResponse that = (SaleItemResponse) o;
+            return Objects.equals(id, that.id) && Objects.equals(productId, that.productId) && Objects.equals(productName, that.productName) && Objects.equals(quantity, that.quantity) && Objects.equals(unitPrice, that.unitPrice) && Objects.equals(subtotal, that.subtotal);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(id, productId, productName, quantity, unitPrice, subtotal);
+        }
+
+        @Override
+        public String toString() {
+            return "SaleItemResponse{" +
+                    "id=" + id +
+                    ", productId=" + productId +
+                    ", productName='" + productName + '\'' +
+                    ", quantity=" + quantity +
+                    ", unitPrice=" + unitPrice +
+                    ", subtotal=" + subtotal +
+                    '}';
+        }
     }
 }

src/main/java/com/petshop/backend/dto/service/ServiceRequest.java

@@ -3,9 +3,8 @@ package com.petshop.backend.dto.service;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Positive;
-
 import java.math.BigDecimal;
-
+import java.util.Objects;
 
 public class ServiceRequest {
     @NotBlank(message = "Service name is required")
@@ -21,4 +20,72 @@ public class ServiceRequest {
     private Integer serviceDurationMinutes;
 
     private Boolean active = true;
+
+    public String getServiceName() {
+        return serviceName;
+    }
+
+    public void setServiceName(String serviceName) {
+        this.serviceName = serviceName;
+    }
+
+    public String getServiceDescription() {
+        return serviceDescription;
+    }
+
+    public void setServiceDescription(String serviceDescription) {
+        this.serviceDescription = serviceDescription;
+    }
+
+    public BigDecimal getServicePrice() {
+        return servicePrice;
+    }
+
+    public void setServicePrice(BigDecimal servicePrice) {
+        this.servicePrice = servicePrice;
+    }
+
+    public Integer getServiceDurationMinutes() {
+        return serviceDurationMinutes;
+    }
+
+    public void setServiceDurationMinutes(Integer serviceDurationMinutes) {
+        this.serviceDurationMinutes = serviceDurationMinutes;
+    }
+
+    public Boolean getActive() {
+        return active;
+    }
+
+    public void setActive(Boolean active) {
+        this.active = active;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ServiceRequest that = (ServiceRequest) o;
+        return Objects.equals(serviceName, that.serviceName) &&
+                Objects.equals(serviceDescription, that.serviceDescription) &&
+                Objects.equals(servicePrice, that.servicePrice) &&
+                Objects.equals(serviceDurationMinutes, that.serviceDurationMinutes) &&
+                Objects.equals(active, that.active);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(serviceName, serviceDescription, servicePrice, serviceDurationMinutes, active);
+    }
+
+    @Override
+    public String toString() {
+        return "ServiceRequest{" +
+                "serviceName='" + serviceName + '\'' +
+                ", serviceDescription='" + serviceDescription + '\'' +
+                ", servicePrice=" + servicePrice +
+                ", serviceDurationMinutes=" + serviceDurationMinutes +
+                ", active=" + active +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/service/ServiceResponse.java

@@ -1,11 +1,8 @@
 package com.petshop.backend.dto.service;
 
-
 import java.math.BigDecimal;
 import java.time.LocalDateTime;
-
-
-
+import java.util.Objects;
 
 public class ServiceResponse {
     private Long id;
@@ -16,4 +13,109 @@ public class ServiceResponse {
     private Boolean active;
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
+
+    public ServiceResponse() {
+    }
+
+    public ServiceResponse(Long id, String serviceName, String serviceDescription, BigDecimal servicePrice, Integer serviceDurationMinutes, Boolean active, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.serviceName = serviceName;
+        this.serviceDescription = serviceDescription;
+        this.servicePrice = servicePrice;
+        this.serviceDurationMinutes = serviceDurationMinutes;
+        this.active = active;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getServiceName() {
+        return serviceName;
+    }
+
+    public void setServiceName(String serviceName) {
+        this.serviceName = serviceName;
+    }
+
+    public String getServiceDescription() {
+        return serviceDescription;
+    }
+
+    public void setServiceDescription(String serviceDescription) {
+        this.serviceDescription = serviceDescription;
+    }
+
+    public BigDecimal getServicePrice() {
+        return servicePrice;
+    }
+
+    public void setServicePrice(BigDecimal servicePrice) {
+        this.servicePrice = servicePrice;
+    }
+
+    public Integer getServiceDurationMinutes() {
+        return serviceDurationMinutes;
+    }
+
+    public void setServiceDurationMinutes(Integer serviceDurationMinutes) {
+        this.serviceDurationMinutes = serviceDurationMinutes;
+    }
+
+    public Boolean getActive() {
+        return active;
+    }
+
+    public void setActive(Boolean active) {
+        this.active = active;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ServiceResponse that = (ServiceResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(serviceName, that.serviceName) && Objects.equals(serviceDescription, that.serviceDescription) && Objects.equals(servicePrice, that.servicePrice) && Objects.equals(serviceDurationMinutes, that.serviceDurationMinutes) && Objects.equals(active, that.active) && Objects.equals(createdAt, that.createdAt) && Objects.equals(updatedAt, that.updatedAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, serviceName, serviceDescription, servicePrice, serviceDurationMinutes, active, createdAt, updatedAt);
+    }
+
+    @Override
+    public String toString() {
+        return "ServiceResponse{" +
+                "id=" + id +
+                ", serviceName='" + serviceName + '\'' +
+                ", serviceDescription='" + serviceDescription + '\'' +
+                ", servicePrice=" + servicePrice +
+                ", serviceDurationMinutes=" + serviceDurationMinutes +
+                ", active=" + active +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/supplier/SupplierRequest.java

@@ -2,7 +2,7 @@ package com.petshop.backend.dto.supplier;
 
 import jakarta.validation.constraints.Email;
 import jakarta.validation.constraints.NotBlank;
-
+import java.util.Objects;
 
 public class SupplierRequest {
     @NotBlank(message = "Supplier name is required")
@@ -16,4 +16,82 @@ public class SupplierRequest {
     private String supplierPhone;
     private String supplierAddress;
     private Boolean active = true;
+
+    public String getSupplierName() {
+        return supplierName;
+    }
+
+    public void setSupplierName(String supplierName) {
+        this.supplierName = supplierName;
+    }
+
+    public String getSupplierContact() {
+        return supplierContact;
+    }
+
+    public void setSupplierContact(String supplierContact) {
+        this.supplierContact = supplierContact;
+    }
+
+    public String getSupplierEmail() {
+        return supplierEmail;
+    }
+
+    public void setSupplierEmail(String supplierEmail) {
+        this.supplierEmail = supplierEmail;
+    }
+
+    public String getSupplierPhone() {
+        return supplierPhone;
+    }
+
+    public void setSupplierPhone(String supplierPhone) {
+        this.supplierPhone = supplierPhone;
+    }
+
+    public String getSupplierAddress() {
+        return supplierAddress;
+    }
+
+    public void setSupplierAddress(String supplierAddress) {
+        this.supplierAddress = supplierAddress;
+    }
+
+    public Boolean getActive() {
+        return active;
+    }
+
+    public void setActive(Boolean active) {
+        this.active = active;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        SupplierRequest that = (SupplierRequest) o;
+        return Objects.equals(supplierName, that.supplierName) &&
+                Objects.equals(supplierContact, that.supplierContact) &&
+                Objects.equals(supplierEmail, that.supplierEmail) &&
+                Objects.equals(supplierPhone, that.supplierPhone) &&
+                Objects.equals(supplierAddress, that.supplierAddress) &&
+                Objects.equals(active, that.active);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(supplierName, supplierContact, supplierEmail, supplierPhone, supplierAddress, active);
+    }
+
+    @Override
+    public String toString() {
+        return "SupplierRequest{" +
+                "supplierName='" + supplierName + '\'' +
+                ", supplierContact='" + supplierContact + '\'' +
+                ", supplierEmail='" + supplierEmail + '\'' +
+                ", supplierPhone='" + supplierPhone + '\'' +
+                ", supplierAddress='" + supplierAddress + '\'' +
+                ", active=" + active +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/supplier/SupplierResponse.java

@@ -1,10 +1,7 @@
 package com.petshop.backend.dto.supplier;
 
-
 import java.time.LocalDateTime;
-
-
-
+import java.util.Objects;
 
 public class SupplierResponse {
     private Long id;
@@ -16,4 +13,119 @@ public class SupplierResponse {
     private Boolean active;
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
+
+    public SupplierResponse() {
+    }
+
+    public SupplierResponse(Long id, String supplierName, String supplierContact, String supplierEmail, String supplierPhone, String supplierAddress, Boolean active, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.supplierName = supplierName;
+        this.supplierContact = supplierContact;
+        this.supplierEmail = supplierEmail;
+        this.supplierPhone = supplierPhone;
+        this.supplierAddress = supplierAddress;
+        this.active = active;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getSupplierName() {
+        return supplierName;
+    }
+
+    public void setSupplierName(String supplierName) {
+        this.supplierName = supplierName;
+    }
+
+    public String getSupplierContact() {
+        return supplierContact;
+    }
+
+    public void setSupplierContact(String supplierContact) {
+        this.supplierContact = supplierContact;
+    }
+
+    public String getSupplierEmail() {
+        return supplierEmail;
+    }
+
+    public void setSupplierEmail(String supplierEmail) {
+        this.supplierEmail = supplierEmail;
+    }
+
+    public String getSupplierPhone() {
+        return supplierPhone;
+    }
+
+    public void setSupplierPhone(String supplierPhone) {
+        this.supplierPhone = supplierPhone;
+    }
+
+    public String getSupplierAddress() {
+        return supplierAddress;
+    }
+
+    public void setSupplierAddress(String supplierAddress) {
+        this.supplierAddress = supplierAddress;
+    }
+
+    public Boolean getActive() {
+        return active;
+    }
+
+    public void setActive(Boolean active) {
+        this.active = active;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        SupplierResponse that = (SupplierResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(supplierName, that.supplierName) && Objects.equals(supplierContact, that.supplierContact) && Objects.equals(supplierEmail, that.supplierEmail) && Objects.equals(supplierPhone, that.supplierPhone) && Objects.equals(supplierAddress, that.supplierAddress) && Objects.equals(active, that.active) && Objects.equals(createdAt, that.createdAt) && Objects.equals(updatedAt, that.updatedAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, supplierName, supplierContact, supplierEmail, supplierPhone, supplierAddress, active, createdAt, updatedAt);
+    }
+
+    @Override
+    public String toString() {
+        return "SupplierResponse{" +
+                "id=" + id +
+                ", supplierName='" + supplierName + '\'' +
+                ", supplierContact='" + supplierContact + '\'' +
+                ", supplierEmail='" + supplierEmail + '\'' +
+                ", supplierPhone='" + supplierPhone + '\'' +
+                ", supplierAddress='" + supplierAddress + '\'' +
+                ", active=" + active +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/user/UserRequest.java

@@ -5,7 +5,7 @@ import jakarta.validation.constraints.Email;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Size;
-
+import java.util.Objects;
 
 public class UserRequest {
     @NotBlank(message = "Username is required")
@@ -25,4 +25,82 @@ public class UserRequest {
     private User.Role role;
 
     private Boolean active = true;
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public String getFullName() {
+        return fullName;
+    }
+
+    public void setFullName(String fullName) {
+        this.fullName = fullName;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public User.Role getRole() {
+        return role;
+    }
+
+    public void setRole(User.Role role) {
+        this.role = role;
+    }
+
+    public Boolean getActive() {
+        return active;
+    }
+
+    public void setActive(Boolean active) {
+        this.active = active;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        UserRequest that = (UserRequest) o;
+        return Objects.equals(username, that.username) &&
+                Objects.equals(password, that.password) &&
+                Objects.equals(fullName, that.fullName) &&
+                Objects.equals(email, that.email) &&
+                role == that.role &&
+                Objects.equals(active, that.active);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(username, password, fullName, email, role, active);
+    }
+
+    @Override
+    public String toString() {
+        return "UserRequest{" +
+                "username='" + username + '\'' +
+                ", password='" + password + '\'' +
+                ", fullName='" + fullName + '\'' +
+                ", email='" + email + '\'' +
+                ", role=" + role +
+                ", active=" + active +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/dto/user/UserResponse.java

@@ -1,10 +1,7 @@
 package com.petshop.backend.dto.user;
 
-
 import java.time.LocalDateTime;
-
-
-
+import java.util.Objects;
 
 public class UserResponse {
     private Long id;
@@ -15,4 +12,109 @@ public class UserResponse {
     private Boolean active;
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
+
+    public UserResponse() {
+    }
+
+    public UserResponse(Long id, String username, String fullName, String email, String role, Boolean active, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.username = username;
+        this.fullName = fullName;
+        this.email = email;
+        this.role = role;
+        this.active = active;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getFullName() {
+        return fullName;
+    }
+
+    public void setFullName(String fullName) {
+        this.fullName = fullName;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public String getRole() {
+        return role;
+    }
+
+    public void setRole(String role) {
+        this.role = role;
+    }
+
+    public Boolean getActive() {
+        return active;
+    }
+
+    public void setActive(Boolean active) {
+        this.active = active;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        UserResponse that = (UserResponse) o;
+        return Objects.equals(id, that.id) && Objects.equals(username, that.username) && Objects.equals(fullName, that.fullName) && Objects.equals(email, that.email) && Objects.equals(role, that.role) && Objects.equals(active, that.active) && Objects.equals(createdAt, that.createdAt) && Objects.equals(updatedAt, that.updatedAt);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, username, fullName, email, role, active, createdAt, updatedAt);
+    }
+
+    @Override
+    public String toString() {
+        return "UserResponse{" +
+                "id=" + id +
+                ", username='" + username + '\'' +
+                ", fullName='" + fullName + '\'' +
+                ", email='" + email + '\'' +
+                ", role='" + role + '\'' +
+                ", active=" + active +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/Adoption.java

@@ -7,12 +7,10 @@ import org.hibernate.annotations.UpdateTimestamp;
 import java.math.BigDecimal;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
+import java.util.Objects;
 
 @Entity
 @Table(name = "adoptions")
-
-
-
 public class Adoption {
 
     @Id
@@ -43,4 +41,109 @@ public class Adoption {
     @UpdateTimestamp
     @Column(name = "updated_at")
     private LocalDateTime updatedAt;
+
+    public Adoption() {
+    }
+
+    public Adoption(Long id, Pet pet, Customer customer, LocalDate adoptionDate, BigDecimal adoptionFee, String notes, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.pet = pet;
+        this.customer = customer;
+        this.adoptionDate = adoptionDate;
+        this.adoptionFee = adoptionFee;
+        this.notes = notes;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Pet getPet() {
+        return pet;
+    }
+
+    public void setPet(Pet pet) {
+        this.pet = pet;
+    }
+
+    public Customer getCustomer() {
+        return customer;
+    }
+
+    public void setCustomer(Customer customer) {
+        this.customer = customer;
+    }
+
+    public LocalDate getAdoptionDate() {
+        return adoptionDate;
+    }
+
+    public void setAdoptionDate(LocalDate adoptionDate) {
+        this.adoptionDate = adoptionDate;
+    }
+
+    public BigDecimal getAdoptionFee() {
+        return adoptionFee;
+    }
+
+    public void setAdoptionFee(BigDecimal adoptionFee) {
+        this.adoptionFee = adoptionFee;
+    }
+
+    public String getNotes() {
+        return notes;
+    }
+
+    public void setNotes(String notes) {
+        this.notes = notes;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Adoption adoption = (Adoption) o;
+        return Objects.equals(id, adoption.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Adoption{" +
+                "id=" + id +
+                ", pet=" + pet +
+                ", customer=" + customer +
+                ", adoptionDate=" + adoptionDate +
+                ", adoptionFee=" + adoptionFee +
+                ", notes='" + notes + '\'' +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/Appointment.java

@@ -8,13 +8,11 @@ import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.time.LocalTime;
 import java.util.HashSet;
+import java.util.Objects;
 import java.util.Set;
 
 @Entity
 @Table(name = "appointments")
-
-
-
 public class Appointment {
 
     @Id
@@ -61,4 +59,129 @@ public class Appointment {
     public enum AppointmentStatus {
         Scheduled, Completed, Cancelled
     }
+
+    public Appointment() {
+    }
+
+    public Appointment(Long id, Customer customer, Service service, LocalDate appointmentDate, LocalTime appointmentTime, AppointmentStatus status, String notes, Set<Pet> pets, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.customer = customer;
+        this.service = service;
+        this.appointmentDate = appointmentDate;
+        this.appointmentTime = appointmentTime;
+        this.status = status;
+        this.notes = notes;
+        this.pets = pets;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Customer getCustomer() {
+        return customer;
+    }
+
+    public void setCustomer(Customer customer) {
+        this.customer = customer;
+    }
+
+    public Service getService() {
+        return service;
+    }
+
+    public void setService(Service service) {
+        this.service = service;
+    }
+
+    public LocalDate getAppointmentDate() {
+        return appointmentDate;
+    }
+
+    public void setAppointmentDate(LocalDate appointmentDate) {
+        this.appointmentDate = appointmentDate;
+    }
+
+    public LocalTime getAppointmentTime() {
+        return appointmentTime;
+    }
+
+    public void setAppointmentTime(LocalTime appointmentTime) {
+        this.appointmentTime = appointmentTime;
+    }
+
+    public AppointmentStatus getStatus() {
+        return status;
+    }
+
+    public void setStatus(AppointmentStatus status) {
+        this.status = status;
+    }
+
+    public String getNotes() {
+        return notes;
+    }
+
+    public void setNotes(String notes) {
+        this.notes = notes;
+    }
+
+    public Set<Pet> getPets() {
+        return pets;
+    }
+
+    public void setPets(Set<Pet> pets) {
+        this.pets = pets;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Appointment that = (Appointment) o;
+        return Objects.equals(id, that.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Appointment{" +
+                "id=" + id +
+                ", customer=" + customer +
+                ", service=" + service +
+                ", appointmentDate=" + appointmentDate +
+                ", appointmentTime=" + appointmentTime +
+                ", status=" + status +
+                ", notes='" + notes + '\'' +
+                ", pets=" + pets +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/Category.java

@@ -5,12 +5,10 @@ import org.hibernate.annotations.CreationTimestamp;
 import org.hibernate.annotations.UpdateTimestamp;
 
 import java.time.LocalDateTime;
+import java.util.Objects;
 
 @Entity
 @Table(name = "categories")
-
-
-
 public class Category {
 
     @Id
@@ -30,4 +28,79 @@ public class Category {
     @UpdateTimestamp
     @Column(name = "updated_at")
     private LocalDateTime updatedAt;
+
+    public Category() {
+    }
+
+    public Category(Long id, String categoryName, String categoryDescription, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.categoryName = categoryName;
+        this.categoryDescription = categoryDescription;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getCategoryName() {
+        return categoryName;
+    }
+
+    public void setCategoryName(String categoryName) {
+        this.categoryName = categoryName;
+    }
+
+    public String getCategoryDescription() {
+        return categoryDescription;
+    }
+
+    public void setCategoryDescription(String categoryDescription) {
+        this.categoryDescription = categoryDescription;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Category category = (Category) o;
+        return Objects.equals(id, category.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Category{" +
+                "id=" + id +
+                ", categoryName='" + categoryName + '\'' +
+                ", categoryDescription='" + categoryDescription + '\'' +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/Customer.java

@@ -5,12 +5,10 @@ import org.hibernate.annotations.CreationTimestamp;
 import org.hibernate.annotations.UpdateTimestamp;
 
 import java.time.LocalDateTime;
+import java.util.Objects;
 
 @Entity
 @Table(name = "customers")
-
-
-
 public class Customer {
 
     @Id
@@ -36,4 +34,99 @@ public class Customer {
     @UpdateTimestamp
     @Column(name = "updated_at")
     private LocalDateTime updatedAt;
+
+    public Customer() {
+    }
+
+    public Customer(Long id, String customerName, String customerEmail, String customerPhone, String customerAddress, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.customerName = customerName;
+        this.customerEmail = customerEmail;
+        this.customerPhone = customerPhone;
+        this.customerAddress = customerAddress;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getCustomerName() {
+        return customerName;
+    }
+
+    public void setCustomerName(String customerName) {
+        this.customerName = customerName;
+    }
+
+    public String getCustomerEmail() {
+        return customerEmail;
+    }
+
+    public void setCustomerEmail(String customerEmail) {
+        this.customerEmail = customerEmail;
+    }
+
+    public String getCustomerPhone() {
+        return customerPhone;
+    }
+
+    public void setCustomerPhone(String customerPhone) {
+        this.customerPhone = customerPhone;
+    }
+
+    public String getCustomerAddress() {
+        return customerAddress;
+    }
+
+    public void setCustomerAddress(String customerAddress) {
+        this.customerAddress = customerAddress;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Customer customer = (Customer) o;
+        return Objects.equals(id, customer.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Customer{" +
+                "id=" + id +
+                ", customerName='" + customerName + '\'' +
+                ", customerEmail='" + customerEmail + '\'' +
+                ", customerPhone='" + customerPhone + '\'' +
+                ", customerAddress='" + customerAddress + '\'' +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/Inventory.java

@@ -5,14 +5,12 @@ import org.hibernate.annotations.CreationTimestamp;
 import org.hibernate.annotations.UpdateTimestamp;
 
 import java.time.LocalDateTime;
+import java.util.Objects;
 
 @Entity
 @Table(name = "inventory", uniqueConstraints = {
     @UniqueConstraint(name = "unique_product_store", columnNames = {"product_id", "store_id"})
 })
-
-
-
 public class Inventory {
 
     @Id
@@ -43,4 +41,109 @@ public class Inventory {
     @UpdateTimestamp
     @Column(name = "updated_at")
     private LocalDateTime updatedAt;
+
+    public Inventory() {
+    }
+
+    public Inventory(Long id, Product product, Store store, Integer quantity, Integer reorderLevel, LocalDateTime lastRestocked, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.product = product;
+        this.store = store;
+        this.quantity = quantity;
+        this.reorderLevel = reorderLevel;
+        this.lastRestocked = lastRestocked;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Product getProduct() {
+        return product;
+    }
+
+    public void setProduct(Product product) {
+        this.product = product;
+    }
+
+    public Store getStore() {
+        return store;
+    }
+
+    public void setStore(Store store) {
+        this.store = store;
+    }
+
+    public Integer getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(Integer quantity) {
+        this.quantity = quantity;
+    }
+
+    public Integer getReorderLevel() {
+        return reorderLevel;
+    }
+
+    public void setReorderLevel(Integer reorderLevel) {
+        this.reorderLevel = reorderLevel;
+    }
+
+    public LocalDateTime getLastRestocked() {
+        return lastRestocked;
+    }
+
+    public void setLastRestocked(LocalDateTime lastRestocked) {
+        this.lastRestocked = lastRestocked;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Inventory inventory = (Inventory) o;
+        return Objects.equals(id, inventory.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Inventory{" +
+                "id=" + id +
+                ", product=" + product +
+                ", store=" + store +
+                ", quantity=" + quantity +
+                ", reorderLevel=" + reorderLevel +
+                ", lastRestocked=" + lastRestocked +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/Pet.java

@@ -6,12 +6,10 @@ import org.hibernate.annotations.UpdateTimestamp;
 
 import java.math.BigDecimal;
 import java.time.LocalDateTime;
+import java.util.Objects;
 
 @Entity
 @Table(name = "pets")
-
-
-
 public class Pet {
 
     @Id
@@ -48,4 +46,119 @@ public class Pet {
     public enum PetStatus {
         Available, Adopted, Under_Care
     }
+
+    public Pet() {
+    }
+
+    public Pet(Long id, String petName, String petSpecies, String petBreed, Integer petAge, PetStatus petStatus, BigDecimal petPrice, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.petName = petName;
+        this.petSpecies = petSpecies;
+        this.petBreed = petBreed;
+        this.petAge = petAge;
+        this.petStatus = petStatus;
+        this.petPrice = petPrice;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getPetName() {
+        return petName;
+    }
+
+    public void setPetName(String petName) {
+        this.petName = petName;
+    }
+
+    public String getPetSpecies() {
+        return petSpecies;
+    }
+
+    public void setPetSpecies(String petSpecies) {
+        this.petSpecies = petSpecies;
+    }
+
+    public String getPetBreed() {
+        return petBreed;
+    }
+
+    public void setPetBreed(String petBreed) {
+        this.petBreed = petBreed;
+    }
+
+    public Integer getPetAge() {
+        return petAge;
+    }
+
+    public void setPetAge(Integer petAge) {
+        this.petAge = petAge;
+    }
+
+    public PetStatus getPetStatus() {
+        return petStatus;
+    }
+
+    public void setPetStatus(PetStatus petStatus) {
+        this.petStatus = petStatus;
+    }
+
+    public BigDecimal getPetPrice() {
+        return petPrice;
+    }
+
+    public void setPetPrice(BigDecimal petPrice) {
+        this.petPrice = petPrice;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Pet pet = (Pet) o;
+        return Objects.equals(id, pet.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Pet{" +
+                "id=" + id +
+                ", petName='" + petName + '\'' +
+                ", petSpecies='" + petSpecies + '\'' +
+                ", petBreed='" + petBreed + '\'' +
+                ", petAge=" + petAge +
+                ", petStatus=" + petStatus +
+                ", petPrice=" + petPrice +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/Product.java

@@ -6,12 +6,10 @@ import org.hibernate.annotations.UpdateTimestamp;
 
 import java.math.BigDecimal;
 import java.time.LocalDateTime;
+import java.util.Objects;
 
 @Entity
 @Table(name = "products")
-
-
-
 public class Product {
 
     @Id
@@ -41,4 +39,109 @@ public class Product {
     @UpdateTimestamp
     @Column(name = "updated_at")
     private LocalDateTime updatedAt;
+
+    public Product() {
+    }
+
+    public Product(Long id, String productName, Category category, String productDescription, BigDecimal productPrice, Boolean active, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.productName = productName;
+        this.category = category;
+        this.productDescription = productDescription;
+        this.productPrice = productPrice;
+        this.active = active;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getProductName() {
+        return productName;
+    }
+
+    public void setProductName(String productName) {
+        this.productName = productName;
+    }
+
+    public Category getCategory() {
+        return category;
+    }
+
+    public void setCategory(Category category) {
+        this.category = category;
+    }
+
+    public String getProductDescription() {
+        return productDescription;
+    }
+
+    public void setProductDescription(String productDescription) {
+        this.productDescription = productDescription;
+    }
+
+    public BigDecimal getProductPrice() {
+        return productPrice;
+    }
+
+    public void setProductPrice(BigDecimal productPrice) {
+        this.productPrice = productPrice;
+    }
+
+    public Boolean getActive() {
+        return active;
+    }
+
+    public void setActive(Boolean active) {
+        this.active = active;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Product product = (Product) o;
+        return Objects.equals(id, product.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Product{" +
+                "id=" + id +
+                ", productName='" + productName + '\'' +
+                ", category=" + category +
+                ", productDescription='" + productDescription + '\'' +
+                ", productPrice=" + productPrice +
+                ", active=" + active +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/ProductSupplier.java

@@ -7,12 +7,10 @@ import org.hibernate.annotations.UpdateTimestamp;
 import java.io.Serializable;
 import java.math.BigDecimal;
 import java.time.LocalDateTime;
+import java.util.Objects;
 
 @Entity
 @Table(name = "product_suppliers")
-
-
-
 @IdClass(ProductSupplier.ProductSupplierId.class)
 public class ProductSupplier {
 
@@ -43,11 +41,148 @@ public class ProductSupplier {
     @Column(name = "updated_at")
     private LocalDateTime updatedAt;
 
-    
-    
-    
+    public ProductSupplier() {
+    }
+
+    public ProductSupplier(Product product, Supplier supplier, BigDecimal costPrice, Integer leadTimeDays, Boolean isPreferred, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.product = product;
+        this.supplier = supplier;
+        this.costPrice = costPrice;
+        this.leadTimeDays = leadTimeDays;
+        this.isPreferred = isPreferred;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Product getProduct() {
+        return product;
+    }
+
+    public void setProduct(Product product) {
+        this.product = product;
+    }
+
+    public Supplier getSupplier() {
+        return supplier;
+    }
+
+    public void setSupplier(Supplier supplier) {
+        this.supplier = supplier;
+    }
+
+    public BigDecimal getCostPrice() {
+        return costPrice;
+    }
+
+    public void setCostPrice(BigDecimal costPrice) {
+        this.costPrice = costPrice;
+    }
+
+    public Integer getLeadTimeDays() {
+        return leadTimeDays;
+    }
+
+    public void setLeadTimeDays(Integer leadTimeDays) {
+        this.leadTimeDays = leadTimeDays;
+    }
+
+    public Boolean getIsPreferred() {
+        return isPreferred;
+    }
+
+    public void setIsPreferred(Boolean isPreferred) {
+        this.isPreferred = isPreferred;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        ProductSupplier that = (ProductSupplier) o;
+        return Objects.equals(product, that.product) && Objects.equals(supplier, that.supplier);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(product, supplier);
+    }
+
+    @Override
+    public String toString() {
+        return "ProductSupplier{" +
+                "product=" + product +
+                ", supplier=" + supplier +
+                ", costPrice=" + costPrice +
+                ", leadTimeDays=" + leadTimeDays +
+                ", isPreferred=" + isPreferred +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
+
     public static class ProductSupplierId implements Serializable {
         private Long product;
         private Long supplier;
+
+        public ProductSupplierId() {
+        }
+
+        public ProductSupplierId(Long product, Long supplier) {
+            this.product = product;
+            this.supplier = supplier;
+        }
+
+        public Long getProduct() {
+            return product;
+        }
+
+        public void setProduct(Long product) {
+            this.product = product;
+        }
+
+        public Long getSupplier() {
+            return supplier;
+        }
+
+        public void setSupplier(Long supplier) {
+            this.supplier = supplier;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            ProductSupplierId that = (ProductSupplierId) o;
+            return Objects.equals(product, that.product) && Objects.equals(supplier, that.supplier);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(product, supplier);
+        }
+
+        @Override
+        public String toString() {
+            return "ProductSupplierId{" +
+                    "product=" + product +
+                    ", supplier=" + supplier +
+                    '}';
+        }
     }
 }

src/main/java/com/petshop/backend/entity/PurchaseOrder.java

@@ -9,12 +9,10 @@ import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
 
 @Entity
 @Table(name = "purchase_orders")
-
-
-
 public class PurchaseOrder {
 
     @Id
@@ -55,4 +53,129 @@ public class PurchaseOrder {
     public enum OrderStatus {
         Pending, Delivered, Cancelled
     }
+
+    public PurchaseOrder() {
+    }
+
+    public PurchaseOrder(Long id, Supplier supplier, LocalDate orderDate, LocalDate expectedDelivery, OrderStatus status, BigDecimal totalAmount, String notes, List<PurchaseOrderItem> items, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.supplier = supplier;
+        this.orderDate = orderDate;
+        this.expectedDelivery = expectedDelivery;
+        this.status = status;
+        this.totalAmount = totalAmount;
+        this.notes = notes;
+        this.items = items;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Supplier getSupplier() {
+        return supplier;
+    }
+
+    public void setSupplier(Supplier supplier) {
+        this.supplier = supplier;
+    }
+
+    public LocalDate getOrderDate() {
+        return orderDate;
+    }
+
+    public void setOrderDate(LocalDate orderDate) {
+        this.orderDate = orderDate;
+    }
+
+    public LocalDate getExpectedDelivery() {
+        return expectedDelivery;
+    }
+
+    public void setExpectedDelivery(LocalDate expectedDelivery) {
+        this.expectedDelivery = expectedDelivery;
+    }
+
+    public OrderStatus getStatus() {
+        return status;
+    }
+
+    public void setStatus(OrderStatus status) {
+        this.status = status;
+    }
+
+    public BigDecimal getTotalAmount() {
+        return totalAmount;
+    }
+
+    public void setTotalAmount(BigDecimal totalAmount) {
+        this.totalAmount = totalAmount;
+    }
+
+    public String getNotes() {
+        return notes;
+    }
+
+    public void setNotes(String notes) {
+        this.notes = notes;
+    }
+
+    public List<PurchaseOrderItem> getItems() {
+        return items;
+    }
+
+    public void setItems(List<PurchaseOrderItem> items) {
+        this.items = items;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        PurchaseOrder that = (PurchaseOrder) o;
+        return Objects.equals(id, that.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "PurchaseOrder{" +
+                "id=" + id +
+                ", supplier=" + supplier +
+                ", orderDate=" + orderDate +
+                ", expectedDelivery=" + expectedDelivery +
+                ", status=" + status +
+                ", totalAmount=" + totalAmount +
+                ", notes='" + notes + '\'' +
+                ", items=" + items +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/PurchaseOrderItem.java

@@ -3,12 +3,10 @@ package com.petshop.backend.entity;
 import jakarta.persistence.*;
 
 import java.math.BigDecimal;
+import java.util.Objects;
 
 @Entity
 @Table(name = "purchase_order_items")
-
-
-
 public class PurchaseOrderItem {
 
     @Id
@@ -31,4 +29,89 @@ public class PurchaseOrderItem {
 
     @Column(nullable = false, precision = 10, scale = 2)
     private BigDecimal subtotal;
+
+    public PurchaseOrderItem() {
+    }
+
+    public PurchaseOrderItem(Long id, PurchaseOrder purchaseOrder, Product product, Integer quantity, BigDecimal unitCost, BigDecimal subtotal) {
+        this.id = id;
+        this.purchaseOrder = purchaseOrder;
+        this.product = product;
+        this.quantity = quantity;
+        this.unitCost = unitCost;
+        this.subtotal = subtotal;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public PurchaseOrder getPurchaseOrder() {
+        return purchaseOrder;
+    }
+
+    public void setPurchaseOrder(PurchaseOrder purchaseOrder) {
+        this.purchaseOrder = purchaseOrder;
+    }
+
+    public Product getProduct() {
+        return product;
+    }
+
+    public void setProduct(Product product) {
+        this.product = product;
+    }
+
+    public Integer getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(Integer quantity) {
+        this.quantity = quantity;
+    }
+
+    public BigDecimal getUnitCost() {
+        return unitCost;
+    }
+
+    public void setUnitCost(BigDecimal unitCost) {
+        this.unitCost = unitCost;
+    }
+
+    public BigDecimal getSubtotal() {
+        return subtotal;
+    }
+
+    public void setSubtotal(BigDecimal subtotal) {
+        this.subtotal = subtotal;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        PurchaseOrderItem that = (PurchaseOrderItem) o;
+        return Objects.equals(id, that.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "PurchaseOrderItem{" +
+                "id=" + id +
+                ", purchaseOrder=" + purchaseOrder +
+                ", product=" + product +
+                ", quantity=" + quantity +
+                ", unitCost=" + unitCost +
+                ", subtotal=" + subtotal +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/Refund.java

@@ -7,12 +7,10 @@ import java.math.BigDecimal;
 import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
 
 @Entity
 @Table(name = "refunds")
-
-
-
 public class Refund {
 
     @Id
@@ -42,4 +40,109 @@ public class Refund {
     @CreationTimestamp
     @Column(name = "created_at", updatable = false)
     private LocalDateTime createdAt;
+
+    public Refund() {
+    }
+
+    public Refund(Long id, Sale sale, LocalDateTime refundDate, BigDecimal refundAmount, String refundReason, User processedBy, List<RefundItem> items, LocalDateTime createdAt) {
+        this.id = id;
+        this.sale = sale;
+        this.refundDate = refundDate;
+        this.refundAmount = refundAmount;
+        this.refundReason = refundReason;
+        this.processedBy = processedBy;
+        this.items = items;
+        this.createdAt = createdAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Sale getSale() {
+        return sale;
+    }
+
+    public void setSale(Sale sale) {
+        this.sale = sale;
+    }
+
+    public LocalDateTime getRefundDate() {
+        return refundDate;
+    }
+
+    public void setRefundDate(LocalDateTime refundDate) {
+        this.refundDate = refundDate;
+    }
+
+    public BigDecimal getRefundAmount() {
+        return refundAmount;
+    }
+
+    public void setRefundAmount(BigDecimal refundAmount) {
+        this.refundAmount = refundAmount;
+    }
+
+    public String getRefundReason() {
+        return refundReason;
+    }
+
+    public void setRefundReason(String refundReason) {
+        this.refundReason = refundReason;
+    }
+
+    public User getProcessedBy() {
+        return processedBy;
+    }
+
+    public void setProcessedBy(User processedBy) {
+        this.processedBy = processedBy;
+    }
+
+    public List<RefundItem> getItems() {
+        return items;
+    }
+
+    public void setItems(List<RefundItem> items) {
+        this.items = items;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Refund refund = (Refund) o;
+        return Objects.equals(id, refund.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Refund{" +
+                "id=" + id +
+                ", sale=" + sale +
+                ", refundDate=" + refundDate +
+                ", refundAmount=" + refundAmount +
+                ", refundReason='" + refundReason + '\'' +
+                ", processedBy=" + processedBy +
+                ", items=" + items +
+                ", createdAt=" + createdAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/RefundItem.java

@@ -3,12 +3,10 @@ package com.petshop.backend.entity;
 import jakarta.persistence.*;
 
 import java.math.BigDecimal;
+import java.util.Objects;
 
 @Entity
 @Table(name = "refund_items")
-
-
-
 public class RefundItem {
 
     @Id
@@ -28,4 +26,79 @@ public class RefundItem {
 
     @Column(name = "refund_amount", nullable = false, precision = 10, scale = 2)
     private BigDecimal refundAmount;
+
+    public RefundItem() {
+    }
+
+    public RefundItem(Long id, Refund refund, SaleItem saleItem, Integer quantity, BigDecimal refundAmount) {
+        this.id = id;
+        this.refund = refund;
+        this.saleItem = saleItem;
+        this.quantity = quantity;
+        this.refundAmount = refundAmount;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Refund getRefund() {
+        return refund;
+    }
+
+    public void setRefund(Refund refund) {
+        this.refund = refund;
+    }
+
+    public SaleItem getSaleItem() {
+        return saleItem;
+    }
+
+    public void setSaleItem(SaleItem saleItem) {
+        this.saleItem = saleItem;
+    }
+
+    public Integer getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(Integer quantity) {
+        this.quantity = quantity;
+    }
+
+    public BigDecimal getRefundAmount() {
+        return refundAmount;
+    }
+
+    public void setRefundAmount(BigDecimal refundAmount) {
+        this.refundAmount = refundAmount;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        RefundItem that = (RefundItem) o;
+        return Objects.equals(id, that.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "RefundItem{" +
+                "id=" + id +
+                ", refund=" + refund +
+                ", saleItem=" + saleItem +
+                ", quantity=" + quantity +
+                ", refundAmount=" + refundAmount +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/Sale.java

@@ -7,12 +7,10 @@ import java.math.BigDecimal;
 import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Objects;
 
 @Entity
 @Table(name = "sales")
-
-
-
 public class Sale {
 
     @Id
@@ -55,4 +53,149 @@ public class Sale {
     @CreationTimestamp
     @Column(name = "created_at", updatable = false)
     private LocalDateTime createdAt;
+
+    public Sale() {
+    }
+
+    public Sale(Long id, LocalDateTime saleDate, User employee, Customer customer, Store store, BigDecimal subtotal, BigDecimal tax, BigDecimal total, String paymentMethod, String notes, List<SaleItem> items, LocalDateTime createdAt) {
+        this.id = id;
+        this.saleDate = saleDate;
+        this.employee = employee;
+        this.customer = customer;
+        this.store = store;
+        this.subtotal = subtotal;
+        this.tax = tax;
+        this.total = total;
+        this.paymentMethod = paymentMethod;
+        this.notes = notes;
+        this.items = items;
+        this.createdAt = createdAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public LocalDateTime getSaleDate() {
+        return saleDate;
+    }
+
+    public void setSaleDate(LocalDateTime saleDate) {
+        this.saleDate = saleDate;
+    }
+
+    public User getEmployee() {
+        return employee;
+    }
+
+    public void setEmployee(User employee) {
+        this.employee = employee;
+    }
+
+    public Customer getCustomer() {
+        return customer;
+    }
+
+    public void setCustomer(Customer customer) {
+        this.customer = customer;
+    }
+
+    public Store getStore() {
+        return store;
+    }
+
+    public void setStore(Store store) {
+        this.store = store;
+    }
+
+    public BigDecimal getSubtotal() {
+        return subtotal;
+    }
+
+    public void setSubtotal(BigDecimal subtotal) {
+        this.subtotal = subtotal;
+    }
+
+    public BigDecimal getTax() {
+        return tax;
+    }
+
+    public void setTax(BigDecimal tax) {
+        this.tax = tax;
+    }
+
+    public BigDecimal getTotal() {
+        return total;
+    }
+
+    public void setTotal(BigDecimal total) {
+        this.total = total;
+    }
+
+    public String getPaymentMethod() {
+        return paymentMethod;
+    }
+
+    public void setPaymentMethod(String paymentMethod) {
+        this.paymentMethod = paymentMethod;
+    }
+
+    public String getNotes() {
+        return notes;
+    }
+
+    public void setNotes(String notes) {
+        this.notes = notes;
+    }
+
+    public List<SaleItem> getItems() {
+        return items;
+    }
+
+    public void setItems(List<SaleItem> items) {
+        this.items = items;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Sale sale = (Sale) o;
+        return Objects.equals(id, sale.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Sale{" +
+                "id=" + id +
+                ", saleDate=" + saleDate +
+                ", employee=" + employee +
+                ", customer=" + customer +
+                ", store=" + store +
+                ", subtotal=" + subtotal +
+                ", tax=" + tax +
+                ", total=" + total +
+                ", paymentMethod='" + paymentMethod + '\'' +
+                ", notes='" + notes + '\'' +
+                ", items=" + items +
+                ", createdAt=" + createdAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/SaleItem.java

@@ -3,12 +3,10 @@ package com.petshop.backend.entity;
 import jakarta.persistence.*;
 
 import java.math.BigDecimal;
+import java.util.Objects;
 
 @Entity
 @Table(name = "sale_items")
-
-
-
 public class SaleItem {
 
     @Id
@@ -31,4 +29,89 @@ public class SaleItem {
 
     @Column(nullable = false, precision = 10, scale = 2)
     private BigDecimal subtotal;
+
+    public SaleItem() {
+    }
+
+    public SaleItem(Long id, Sale sale, Product product, Integer quantity, BigDecimal unitPrice, BigDecimal subtotal) {
+        this.id = id;
+        this.sale = sale;
+        this.product = product;
+        this.quantity = quantity;
+        this.unitPrice = unitPrice;
+        this.subtotal = subtotal;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Sale getSale() {
+        return sale;
+    }
+
+    public void setSale(Sale sale) {
+        this.sale = sale;
+    }
+
+    public Product getProduct() {
+        return product;
+    }
+
+    public void setProduct(Product product) {
+        this.product = product;
+    }
+
+    public Integer getQuantity() {
+        return quantity;
+    }
+
+    public void setQuantity(Integer quantity) {
+        this.quantity = quantity;
+    }
+
+    public BigDecimal getUnitPrice() {
+        return unitPrice;
+    }
+
+    public void setUnitPrice(BigDecimal unitPrice) {
+        this.unitPrice = unitPrice;
+    }
+
+    public BigDecimal getSubtotal() {
+        return subtotal;
+    }
+
+    public void setSubtotal(BigDecimal subtotal) {
+        this.subtotal = subtotal;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        SaleItem saleItem = (SaleItem) o;
+        return Objects.equals(id, saleItem.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "SaleItem{" +
+                "id=" + id +
+                ", sale=" + sale +
+                ", product=" + product +
+                ", quantity=" + quantity +
+                ", unitPrice=" + unitPrice +
+                ", subtotal=" + subtotal +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/Service.java

@@ -6,12 +6,10 @@ import org.hibernate.annotations.UpdateTimestamp;
 
 import java.math.BigDecimal;
 import java.time.LocalDateTime;
+import java.util.Objects;
 
 @Entity
 @Table(name = "services")
-
-
-
 public class Service {
 
     @Id
@@ -40,4 +38,109 @@ public class Service {
     @UpdateTimestamp
     @Column(name = "updated_at")
     private LocalDateTime updatedAt;
+
+    public Service() {
+    }
+
+    public Service(Long id, String serviceName, String serviceDescription, BigDecimal servicePrice, Integer serviceDurationMinutes, Boolean active, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.serviceName = serviceName;
+        this.serviceDescription = serviceDescription;
+        this.servicePrice = servicePrice;
+        this.serviceDurationMinutes = serviceDurationMinutes;
+        this.active = active;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getServiceName() {
+        return serviceName;
+    }
+
+    public void setServiceName(String serviceName) {
+        this.serviceName = serviceName;
+    }
+
+    public String getServiceDescription() {
+        return serviceDescription;
+    }
+
+    public void setServiceDescription(String serviceDescription) {
+        this.serviceDescription = serviceDescription;
+    }
+
+    public BigDecimal getServicePrice() {
+        return servicePrice;
+    }
+
+    public void setServicePrice(BigDecimal servicePrice) {
+        this.servicePrice = servicePrice;
+    }
+
+    public Integer getServiceDurationMinutes() {
+        return serviceDurationMinutes;
+    }
+
+    public void setServiceDurationMinutes(Integer serviceDurationMinutes) {
+        this.serviceDurationMinutes = serviceDurationMinutes;
+    }
+
+    public Boolean getActive() {
+        return active;
+    }
+
+    public void setActive(Boolean active) {
+        this.active = active;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Service service = (Service) o;
+        return Objects.equals(id, service.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Service{" +
+                "id=" + id +
+                ", serviceName='" + serviceName + '\'' +
+                ", serviceDescription='" + serviceDescription + '\'' +
+                ", servicePrice=" + servicePrice +
+                ", serviceDurationMinutes=" + serviceDurationMinutes +
+                ", active=" + active +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/Store.java

@@ -4,12 +4,10 @@ import jakarta.persistence.*;
 import org.hibernate.annotations.CreationTimestamp;
 
 import java.time.LocalDateTime;
+import java.util.Objects;
 
 @Entity
 @Table(name = "stores")
-
-
-
 public class Store {
 
     @Id
@@ -25,4 +23,69 @@ public class Store {
     @CreationTimestamp
     @Column(name = "created_at", updatable = false)
     private LocalDateTime createdAt;
+
+    public Store() {
+    }
+
+    public Store(Long id, String storeName, String storeLocation, LocalDateTime createdAt) {
+        this.id = id;
+        this.storeName = storeName;
+        this.storeLocation = storeLocation;
+        this.createdAt = createdAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getStoreName() {
+        return storeName;
+    }
+
+    public void setStoreName(String storeName) {
+        this.storeName = storeName;
+    }
+
+    public String getStoreLocation() {
+        return storeLocation;
+    }
+
+    public void setStoreLocation(String storeLocation) {
+        this.storeLocation = storeLocation;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Store store = (Store) o;
+        return Objects.equals(id, store.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Store{" +
+                "id=" + id +
+                ", storeName='" + storeName + '\'' +
+                ", storeLocation='" + storeLocation + '\'' +
+                ", createdAt=" + createdAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/Supplier.java

@@ -5,12 +5,10 @@ import org.hibernate.annotations.CreationTimestamp;
 import org.hibernate.annotations.UpdateTimestamp;
 
 import java.time.LocalDateTime;
+import java.util.Objects;
 
 @Entity
 @Table(name = "suppliers")
-
-
-
 public class Supplier {
 
     @Id
@@ -42,4 +40,119 @@ public class Supplier {
     @UpdateTimestamp
     @Column(name = "updated_at")
     private LocalDateTime updatedAt;
+
+    public Supplier() {
+    }
+
+    public Supplier(Long id, String supplierName, String supplierContact, String supplierEmail, String supplierPhone, String supplierAddress, Boolean active, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.supplierName = supplierName;
+        this.supplierContact = supplierContact;
+        this.supplierEmail = supplierEmail;
+        this.supplierPhone = supplierPhone;
+        this.supplierAddress = supplierAddress;
+        this.active = active;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getSupplierName() {
+        return supplierName;
+    }
+
+    public void setSupplierName(String supplierName) {
+        this.supplierName = supplierName;
+    }
+
+    public String getSupplierContact() {
+        return supplierContact;
+    }
+
+    public void setSupplierContact(String supplierContact) {
+        this.supplierContact = supplierContact;
+    }
+
+    public String getSupplierEmail() {
+        return supplierEmail;
+    }
+
+    public void setSupplierEmail(String supplierEmail) {
+        this.supplierEmail = supplierEmail;
+    }
+
+    public String getSupplierPhone() {
+        return supplierPhone;
+    }
+
+    public void setSupplierPhone(String supplierPhone) {
+        this.supplierPhone = supplierPhone;
+    }
+
+    public String getSupplierAddress() {
+        return supplierAddress;
+    }
+
+    public void setSupplierAddress(String supplierAddress) {
+        this.supplierAddress = supplierAddress;
+    }
+
+    public Boolean getActive() {
+        return active;
+    }
+
+    public void setActive(Boolean active) {
+        this.active = active;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Supplier supplier = (Supplier) o;
+        return Objects.equals(id, supplier.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "Supplier{" +
+                "id=" + id +
+                ", supplierName='" + supplierName + '\'' +
+                ", supplierContact='" + supplierContact + '\'' +
+                ", supplierEmail='" + supplierEmail + '\'' +
+                ", supplierPhone='" + supplierPhone + '\'' +
+                ", supplierAddress='" + supplierAddress + '\'' +
+                ", active=" + active +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/entity/User.java

@@ -5,12 +5,10 @@ import org.hibernate.annotations.CreationTimestamp;
 import org.hibernate.annotations.UpdateTimestamp;
 
 import java.time.LocalDateTime;
+import java.util.Objects;
 
 @Entity
 @Table(name = "users")
-
-
-
 public class User {
 
     @Id
@@ -47,4 +45,119 @@ public class User {
     public enum Role {
         STAFF, ADMIN
     }
+
+    public User() {
+    }
+
+    public User(Long id, String username, String password, String fullName, String email, Role role, Boolean active, LocalDateTime createdAt, LocalDateTime updatedAt) {
+        this.id = id;
+        this.username = username;
+        this.password = password;
+        this.fullName = fullName;
+        this.email = email;
+        this.role = role;
+        this.active = active;
+        this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public String getFullName() {
+        return fullName;
+    }
+
+    public void setFullName(String fullName) {
+        this.fullName = fullName;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public Role getRole() {
+        return role;
+    }
+
+    public void setRole(Role role) {
+        this.role = role;
+    }
+
+    public Boolean getActive() {
+        return active;
+    }
+
+    public void setActive(Boolean active) {
+        this.active = active;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(LocalDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(LocalDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        User user = (User) o;
+        return Objects.equals(id, user.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
+    @Override
+    public String toString() {
+        return "User{" +
+                "id=" + id +
+                ", username='" + username + '\'' +
+                ", password='" + password + '\'' +
+                ", fullName='" + fullName + '\'' +
+                ", email='" + email + '\'' +
+                ", role=" + role +
+                ", active=" + active +
+                ", createdAt=" + createdAt +
+                ", updatedAt=" + updatedAt +
+                '}';
+    }
 }

src/main/java/com/petshop/backend/security/JwtAuthenticationFilter.java

@@ -16,12 +16,16 @@ import org.springframework.web.filter.OncePerRequestFilter;
 import java.io.IOException;
 
 @Component
-
 public class JwtAuthenticationFilter extends OncePerRequestFilter {
 
     private final JwtUtil jwtUtil;
     private final UserDetailsService userDetailsService;
 
+    public JwtAuthenticationFilter(JwtUtil jwtUtil, UserDetailsService userDetailsService) {
+        this.jwtUtil = jwtUtil;
+        this.userDetailsService = userDetailsService;
+    }
+
     @Override
     protected void doFilterInternal(
             @NonNull HttpServletRequest request,

src/main/java/com/petshop/backend/security/SecurityConfig.java

@@ -21,12 +21,16 @@ import org.springframework.security.web.authentication.UsernamePasswordAuthentic
 @Configuration
 @EnableWebSecurity
 @EnableMethodSecurity
-
 public class SecurityConfig {
 
     private final JwtAuthenticationFilter jwtAuthFilter;
     private final UserDetailsService userDetailsService;
 
+    public SecurityConfig(JwtAuthenticationFilter jwtAuthFilter, UserDetailsService userDetailsService) {
+        this.jwtAuthFilter = jwtAuthFilter;
+        this.userDetailsService = userDetailsService;
+    }
+
     @Bean
     public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
         http

src/main/java/com/petshop/backend/security/UserDetailsServiceImpl.java

@@ -11,11 +11,14 @@ import org.springframework.stereotype.Service;
 import java.util.Collections;
 
 @Service
-
 public class UserDetailsServiceImpl implements UserDetailsService {
 
     private final UserRepository userRepository;
 
+    public UserDetailsServiceImpl(UserRepository userRepository) {
+        this.userRepository = userRepository;
+    }
+
     @Override
     public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
         User user = userRepository.findByUsername(username)

src/main/java/com/petshop/backend/service/AdoptionService.java

@@ -16,13 +16,18 @@ import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 @Service
-
 public class AdoptionService {
 
     private final AdoptionRepository adoptionRepository;
     private final PetRepository petRepository;
     private final CustomerRepository customerRepository;
 
+    public AdoptionService(AdoptionRepository adoptionRepository, PetRepository petRepository, CustomerRepository customerRepository) {
+        this.adoptionRepository = adoptionRepository;
+        this.petRepository = petRepository;
+        this.customerRepository = customerRepository;
+    }
+
     public Page<AdoptionResponse> getAllAdoptions(Pageable pageable) {
         return adoptionRepository.findAll(pageable).map(this::mapToResponse);
     }

src/main/java/com/petshop/backend/service/AppointmentService.java

@@ -22,7 +22,6 @@ import java.util.Set;
 import java.util.stream.Collectors;
 
 @Service
-
 public class AppointmentService {
 
     private final AppointmentRepository appointmentRepository;
@@ -30,6 +29,13 @@ public class AppointmentService {
     private final ServiceRepository serviceRepository;
     private final PetRepository petRepository;
 
+    public AppointmentService(AppointmentRepository appointmentRepository, CustomerRepository customerRepository, ServiceRepository serviceRepository, PetRepository petRepository) {
+        this.appointmentRepository = appointmentRepository;
+        this.customerRepository = customerRepository;
+        this.serviceRepository = serviceRepository;
+        this.petRepository = petRepository;
+    }
+
     public Page<AppointmentResponse> getAllAppointments(Pageable pageable) {
         return appointmentRepository.findAll(pageable).map(this::mapToResponse);
     }

src/main/java/com/petshop/backend/service/CategoryService.java

@@ -12,11 +12,14 @@ import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 @Service
-
 public class CategoryService {
 
     private final CategoryRepository categoryRepository;
 
+    public CategoryService(CategoryRepository categoryRepository) {
+        this.categoryRepository = categoryRepository;
+    }
+
     public Page<CategoryResponse> getAllCategories(String query, Pageable pageable) {
         Page<Category> categories;
         if (query != null && !query.trim().isEmpty()) {

src/main/java/com/petshop/backend/service/CustomerService.java

@@ -12,11 +12,14 @@ import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 @Service
-
 public class CustomerService {
 
     private final CustomerRepository customerRepository;
 
+    public CustomerService(CustomerRepository customerRepository) {
+        this.customerRepository = customerRepository;
+    }
+
     public Page<CustomerResponse> getAllCustomers(String query, Pageable pageable) {
         Page<Customer> customers;
         if (query != null && !query.trim().isEmpty()) {

src/main/java/com/petshop/backend/service/InventoryService.java

@@ -18,13 +18,18 @@ import org.springframework.transaction.annotation.Transactional;
 import java.time.LocalDateTime;
 
 @Service
-
 public class InventoryService {
 
     private final InventoryRepository inventoryRepository;
     private final ProductRepository productRepository;
     private final StoreRepository storeRepository;
 
+    public InventoryService(InventoryRepository inventoryRepository, ProductRepository productRepository, StoreRepository storeRepository) {
+        this.inventoryRepository = inventoryRepository;
+        this.productRepository = productRepository;
+        this.storeRepository = storeRepository;
+    }
+
     public Page<InventoryResponse> getAllInventory(Pageable pageable) {
         return inventoryRepository.findAll(pageable).map(this::mapToResponse);
     }

src/main/java/com/petshop/backend/service/PetService.java

@@ -12,11 +12,14 @@ import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 @Service
-
 public class PetService {
 
     private final PetRepository petRepository;
 
+    public PetService(PetRepository petRepository) {
+        this.petRepository = petRepository;
+    }
+
     public Page<PetResponse> getAllPets(String query, Pageable pageable) {
         Page<Pet> pets;
         if (query != null && !query.trim().isEmpty()) {

src/main/java/com/petshop/backend/service/ProductService.java

@@ -14,12 +14,16 @@ import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 @Service
-
 public class ProductService {
 
     private final ProductRepository productRepository;
     private final CategoryRepository categoryRepository;
 
+    public ProductService(ProductRepository productRepository, CategoryRepository categoryRepository) {
+        this.productRepository = productRepository;
+        this.categoryRepository = categoryRepository;
+    }
+
     public Page<ProductResponse> getAllProducts(String query, Pageable pageable) {
         Page<Product> products;
         if (query != null && !query.trim().isEmpty()) {

src/main/java/com/petshop/backend/service/ProductSupplierService.java

@@ -16,13 +16,18 @@ import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 @Service
-
 public class ProductSupplierService {
 
     private final ProductSupplierRepository productSupplierRepository;
     private final ProductRepository productRepository;
     private final SupplierRepository supplierRepository;
 
+    public ProductSupplierService(ProductSupplierRepository productSupplierRepository, ProductRepository productRepository, SupplierRepository supplierRepository) {
+        this.productSupplierRepository = productSupplierRepository;
+        this.productRepository = productRepository;
+        this.supplierRepository = supplierRepository;
+    }
+
     public Page<ProductSupplierResponse> getAllProductSuppliers(Pageable pageable) {
         return productSupplierRepository.findAll(pageable).map(this::mapToResponse);
     }

src/main/java/com/petshop/backend/service/PurchaseOrderService.java

@@ -14,11 +14,14 @@ import java.util.List;
 import java.util.stream.Collectors;
 
 @Service
-
 public class PurchaseOrderService {
 
     private final PurchaseOrderRepository purchaseOrderRepository;
 
+    public PurchaseOrderService(PurchaseOrderRepository purchaseOrderRepository) {
+        this.purchaseOrderRepository = purchaseOrderRepository;
+    }
+
     public Page<PurchaseOrderResponse> getAllPurchaseOrders(Pageable pageable) {
         return purchaseOrderRepository.findAll(pageable).map(this::mapToResponse);
     }

src/main/java/com/petshop/backend/service/RefundService.java

@@ -16,7 +16,6 @@ import java.util.ArrayList;
 import java.util.List;
 
 @Service
-
 public class RefundService {
 
     private final RefundRepository refundRepository;
@@ -25,6 +24,14 @@ public class RefundService {
     private final InventoryRepository inventoryRepository;
     private final UserRepository userRepository;
 
+    public RefundService(RefundRepository refundRepository, SaleRepository saleRepository, SaleItemRepository saleItemRepository, InventoryRepository inventoryRepository, UserRepository userRepository) {
+        this.refundRepository = refundRepository;
+        this.saleRepository = saleRepository;
+        this.saleItemRepository = saleItemRepository;
+        this.inventoryRepository = inventoryRepository;
+        this.userRepository = userRepository;
+    }
+
     @Transactional
     public RefundResponse createRefund(Long saleId, RefundRequest request) {
         String username = SecurityContextHolder.getContext().getAuthentication().getName();

src/main/java/com/petshop/backend/service/SaleService.java

@@ -18,7 +18,6 @@ import java.util.ArrayList;
 import java.util.List;
 
 @Service
-
 public class SaleService {
 
     private final SaleRepository saleRepository;
@@ -28,6 +27,15 @@ public class SaleService {
     private final InventoryRepository inventoryRepository;
     private final UserRepository userRepository;
 
+    public SaleService(SaleRepository saleRepository, ProductRepository productRepository, CustomerRepository customerRepository, StoreRepository storeRepository, InventoryRepository inventoryRepository, UserRepository userRepository) {
+        this.saleRepository = saleRepository;
+        this.productRepository = productRepository;
+        this.customerRepository = customerRepository;
+        this.storeRepository = storeRepository;
+        this.inventoryRepository = inventoryRepository;
+        this.userRepository = userRepository;
+    }
+
     public Page<SaleResponse> getAllSales(Pageable pageable) {
         return saleRepository.findAll(pageable).map(this::mapToResponse);
     }

src/main/java/com/petshop/backend/service/ServiceService.java

@@ -11,11 +11,14 @@ import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 @Service
-
 public class ServiceService {
 
     private final ServiceRepository serviceRepository;
 
+    public ServiceService(ServiceRepository serviceRepository) {
+        this.serviceRepository = serviceRepository;
+    }
+
     public Page<ServiceResponse> getAllServices(String query, Pageable pageable) {
         Page<com.petshop.backend.entity.Service> services;
         if (query != null && !query.trim().isEmpty()) {

src/main/java/com/petshop/backend/service/SupplierService.java

@@ -12,11 +12,14 @@ import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 @Service
-
 public class SupplierService {
 
     private final SupplierRepository supplierRepository;
 
+    public SupplierService(SupplierRepository supplierRepository) {
+        this.supplierRepository = supplierRepository;
+    }
+
     public Page<SupplierResponse> getAllSuppliers(String query, Pageable pageable) {
         Page<Supplier> suppliers;
         if (query != null && !query.trim().isEmpty()) {

src/main/java/com/petshop/backend/service/UserService.java

@@ -13,12 +13,16 @@ import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 @Service
-
 public class UserService {
 
     private final UserRepository userRepository;
     private final PasswordEncoder passwordEncoder;
 
+    public UserService(UserRepository userRepository, PasswordEncoder passwordEncoder) {
+        this.userRepository = userRepository;
+        this.passwordEncoder = passwordEncoder;
+    }
+
     public Page<UserResponse> getAllUsers(Pageable pageable) {
         return userRepository.findAll(pageable).map(this::mapToResponse);
     }