spring-boot

@RestController
@RequestMapping("/api/notifications")
public class NotificationController {

    private final SseEmitterRegistry registry;
    private final NotificationService service;

@Entity
@Table(name = "idempotency_records",
       uniqueConstraints = @UniqueConstraint(columnNames = "idempotency_key"))
public class IdempotencyRecord {

    public enum Status { IN_PROGRESS, COMPLETED }

import org.springframework.hateoas.RepresentationModel;
import java.math.BigDecimal;

public class ProductModel extends RepresentationModel<ProductModel> {

    private final Long id;

package com.example.health;

import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.actuate.health.HealthIndicator;
import org.springframework.stereotype.Component;

package com.example.demo.controller;

import com.example.demo.dto.UserDTO;
import com.example.demo.dto.v2.UserDTOV2;
import com.example.demo.service.UserService;
import org.springframework.web.bind.annotation.*;

@Configuration
public class TxConfig {

    @Bean
    public PlatformTransactionManager transactionManager(DataSource dataSource) {
        DataSourceTransactionManager tm = new DataSourceTransactionManager(dataSource);