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Java Code Implementation

    Restaurant Entity (JPA Entity):

@Entity
public class Restaurant {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;
    private String address;
    private String contactNumber;
    private String status;

    @OneToMany(mappedBy = "restaurant")
    private List<Contact> contacts;

    @OneToMany(mappedBy = "restaurant")
    private List<Interaction> interactions;

    @OneToMany(mappedBy = "restaurant")
    private List<Order> orders;

    // Getters and Setters
}

    Contact Entity (JPA Entity):

@Entity
public class Contact {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;
    private String role;
    private String email;
    private String phoneNumber;

    @ManyToOne
    @JoinColumn(name = "restaurant_id")
    private Restaurant restaurant;

    // Getters and Setters
}

    Interaction Entity (JPA Entity):

@Entity
public class Interaction {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private LocalDateTime interactionDate;
    private String interactionType;  // e.g., "Call", "Meeting"
    private String notes;

    @ManyToOne
    @JoinColumn(name = "restaurant_id")
    private Restaurant restaurant;

    // Getters and Setters
}

    Order Entity (JPA Entity):

@Entity
public class Order {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private LocalDateTime orderDate;
    private String orderDetails;
    private String status;

    @ManyToOne
    @JoinColumn(name = "restaurant_id")
    private Restaurant restaurant;

    // Getters and Setters
}

    Repository Layer (Spring Data JPA Repositories):

@Repository
public interface RestaurantRepository extends JpaRepository<Restaurant, Long> {}

@Repository
public interface ContactRepository extends JpaRepository<Contact, Long> {}

@Repository
public interface InteractionRepository extends JpaRepository<Interaction, Long> {}

@Repository
public interface OrderRepository extends JpaRepository<Order, Long> {}

    Service Layer (Business Logic):

@Service
public class KAMService {

    @Autowired
    private RestaurantRepository restaurantRepository;

    @Autowired
    private InteractionRepository interactionRepository;

    @Autowired
    private OrderRepository orderRepository;

    // Add a new restaurant lead
    public Restaurant addRestaurantLead(Restaurant restaurant) {
        return restaurantRepository.save(restaurant);
    }

    // Record an interaction with a restaurant lead
    public Interaction recordInteraction(Interaction interaction) {
        return interactionRepository.save(interaction);
    }

    // Track order placement for a restaurant
    public Order trackOrder(Order order) {
        return orderRepository.save(order);
    }
}

    Controller Layer (REST API Endpoints):

@RestController
@RequestMapping("/api/kam")
public class KAMController {

    @Autowired
    private KAMService kamService;

    // Add a new restaurant lead
    @PostMapping("/leads")
    public ResponseEntity<Restaurant> addRestaurantLead(@RequestBody Restaurant restaurant) {
        Restaurant savedRestaurant = kamService.addRestaurantLead(restaurant);
        return ResponseEntity.status(HttpStatus.CREATED).body(savedRestaurant);
    }

    // Record an interaction
    @PostMapping("/interactions")
    public ResponseEntity<Interaction> recordInteraction(@RequestBody Interaction interaction) {
        Interaction savedInteraction = kamService.recordInteraction(interaction);
        return ResponseEntity.status(HttpStatus.CREATED).body(savedInteraction);
    }

    // Track an order
    @PostMapping("/orders")
    public ResponseEntity<Order> trackOrder(@RequestBody Order order) {
        Order savedOrder = kamService.trackOrder(order);
        return ResponseEntity.status(HttpStatus.CREATED).body(savedOrder);
    }
}