Fix backend warnings

src/main/java/com/petshop/backend/BackendApplication.java

@@ -2,8 +2,10 @@ package com.petshop.backend;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.data.web.config.EnableSpringDataWebSupport;
 
 @SpringBootApplication
+@EnableSpringDataWebSupport(pageSerializationMode = EnableSpringDataWebSupport.PageSerializationMode.VIA_DTO)
 public class BackendApplication {
     public static void main(String[] args) {
         SpringApplication.run(BackendApplication.class, args);

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

@@ -4,7 +4,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.HttpMethod;
 import org.springframework.security.authentication.AuthenticationManager;
-import org.springframework.security.authentication.AuthenticationProvider;
+import org.springframework.security.authentication.ProviderManager;
 import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
 import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
 import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
@@ -48,14 +48,13 @@ public class SecurityConfig {
                         .anyRequest().authenticated()
                 )
                 .sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
-                .authenticationProvider(authenticationProvider())
+                .authenticationProvider(daoAuthenticationProvider())
                 .addFilterBefore(jwtAuthFilter, UsernamePasswordAuthenticationFilter.class);
 
         return http.build();
     }
 
-    @Bean
-    public AuthenticationProvider authenticationProvider() {
+    private DaoAuthenticationProvider daoAuthenticationProvider() {
         DaoAuthenticationProvider authProvider = new DaoAuthenticationProvider(userDetailsService);
         authProvider.setPasswordEncoder(passwordEncoder());
         return authProvider;
@@ -63,7 +62,7 @@ public class SecurityConfig {
 
     @Bean
     public AuthenticationManager authenticationManager(AuthenticationConfiguration config) throws Exception {
-        return config.getAuthenticationManager();
+        return new ProviderManager(daoAuthenticationProvider());
     }
 
     @Bean

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

@@ -8,6 +8,7 @@ import com.petshop.backend.repository.InventoryRepository;
 import com.petshop.backend.repository.ProductRepository;
 import com.petshop.backend.repository.SaleRepository;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
 
 import java.math.BigDecimal;
 import java.time.LocalDate;
@@ -30,6 +31,7 @@ public class AnalyticsService {
         this.productRepository = productRepository;
     }
 
+    @Transactional(readOnly = true)
     public DashboardResponse getDashboardData(int days, int top) {
         LocalDateTime startDate = LocalDateTime.now().minusDays(days);
 

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

@@ -58,6 +58,7 @@ public class AppointmentService {
         this.employeeStoreRepository = employeeStoreRepository;
     }
 
+    @Transactional(readOnly = true)
     public Page<AppointmentResponse> getAllAppointments(String query, Pageable pageable, Long customerId) {
         Page<Appointment> appointments;
 
@@ -78,6 +79,7 @@ public class AppointmentService {
         return appointments.map(this::mapToResponse);
     }
 
+    @Transactional(readOnly = true)
     public AppointmentResponse getAppointmentById(Long id, Long customerId) {
         Appointment appointment = appointmentRepository.findById(id)
                 .orElseThrow(() -> new ResourceNotFoundException("Appointment not found with id: " + id));
@@ -166,6 +168,7 @@ public class AppointmentService {
         appointmentRepository.deleteAllById(request.getIds());
     }
 
+    @Transactional(readOnly = true)
     public List<String> checkAvailability(Long storeId, Long serviceId, LocalDate date) {
         storeRepository.findById(storeId)
                 .orElseThrow(() -> new ResourceNotFoundException("Store not found with id: " + storeId));

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

@@ -40,6 +40,7 @@ public class SaleService {
         this.customerRepository = customerRepository;
     }
 
+    @Transactional(readOnly = true)
     public Page<SaleResponse> getAllSales(String query, Pageable pageable) {
         Page<Sale> sales;
         if (query != null && !query.trim().isEmpty()) {
@@ -50,6 +51,7 @@ public class SaleService {
         return sales.map(this::mapToResponse);
     }
 
+    @Transactional(readOnly = true)
     public SaleResponse getSaleById(Long id) {
         Sale sale = saleRepository.findById(id)
                 .orElseThrow(() -> new ResourceNotFoundException("Sale not found with id: " + id));

src/main/resources/application.yml

@@ -27,7 +27,7 @@ spring:
     properties:
       hibernate:
         format_sql: true
-        dialect: org.hibernate.dialect.MySQLDialect
+    open-in-view: false
 
   flyway:
     enabled: true
@@ -53,3 +53,4 @@ logging:
   level:
     com.petshop: ${LOG_LEVEL:INFO}
     org.springframework.security: ${LOG_LEVEL_SECURITY:WARN}
+    org.springdoc.core.events.SpringDocAppInitializer: ERROR

src/test/java/com/petshop/backend/config/RunConfigValidationTest.java

@@ -64,18 +64,17 @@ class RunConfigValidationTest {
     }
 
     @Test
-    void databaseSchemaFileExists() {
-        File schemaFile = new File("src/main/resources/schema.sql");
-        assertTrue(schemaFile.exists(), "schema.sql should exist in src/main/resources/");
+    void flywayBaselineMigrationExists() {
+        File migrationFile = new File("src/main/resources/db/migration/V1__baseline_schema.sql");
+        assertTrue(migrationFile.exists(), "Flyway baseline migration should exist in src/main/resources/db/migration/");
     }
 
     @Test
-    void schemaContainsActiveColumn() throws Exception {
-        File schemaFile = new File("src/main/resources/schema.sql");
-        String schemaContent = new String(java.nio.file.Files.readAllBytes(schemaFile.toPath()));
+    void flywayBaselineContainsActiveColumn() throws Exception {
+        File migrationFile = new File("src/main/resources/db/migration/V1__baseline_schema.sql");
+        String migrationContent = new String(java.nio.file.Files.readAllBytes(migrationFile.toPath()));
 
-        assertTrue(schemaContent.contains("active BOOLEAN") || schemaContent.contains("active boolean"),
-            "schema.sql should contain 'active' column definition in users table. " +
-            "If you see 'Unknown column active' error, run 'Reset Database Only' configuration.");
+        assertTrue(migrationContent.contains("active BOOLEAN") || migrationContent.contains("active boolean"),
+            "Baseline migration should contain the users.active column definition.");
     }
 }