feat: register suggestion feedback

src/main/java/ac/knu/likeknu/controller/SuggestionController.java

@@ -0,0 +1,27 @@
+package ac.knu.likeknu.controller;
+
+import ac.knu.likeknu.controller.dto.base.ResponseDto;
+import ac.knu.likeknu.controller.dto.suggestion.request.SuggestionRequest;
+import ac.knu.likeknu.service.SuggestionService;
+import jakarta.validation.Valid;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RequestMapping("/api/suggestions")
+@RestController
+public class SuggestionController {
+
+    private final SuggestionService suggestionService;
+
+    public SuggestionController(SuggestionService suggestionService) {
+        this.suggestionService = suggestionService;
+    }
+
+    @PostMapping
+    public ResponseDto<String> registerSuggestion(@RequestBody @Valid SuggestionRequest request) {
+        suggestionService.createNewSuggestion(request);
+        return ResponseDto.of("Your offer has been registered.");
+    }
+}

src/main/java/ac/knu/likeknu/controller/dto/suggestion/request/SuggestionRequest.java

@@ -0,0 +1,10 @@
+package ac.knu.likeknu.controller.dto.suggestion.request;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
+public record SuggestionRequest(
+        @NotBlank String deviceId,
+        @NotBlank @Size(min = 1, max = 500) String content
+) {
+}

src/main/java/ac/knu/likeknu/domain/Suggestion.java

@@ -0,0 +1,46 @@
+package ac.knu.likeknu.domain;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import lombok.Builder;
+import lombok.Getter;
+
+import java.time.LocalDateTime;
+
+@Getter
+@Table(name = "suggestion")
+@Entity
+public class Suggestion {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    private String content;
+
+    private LocalDateTime createdAt;
+
+    @JoinColumn(name = "device")
+    @ManyToOne(fetch = FetchType.LAZY)
+    private Device device;
+
+    protected Suggestion() {
+    }
+
+    @Builder
+    public Suggestion(String content, LocalDateTime createdAt, Device device) {
+        this.content = content;
+        this.createdAt = createdAt;
+        this.device = device;
+    }
+
+    public static Suggestion of(Device device, String content) {
+        return new Suggestion(content, LocalDateTime.now(), device);
+    }
+}

src/main/java/ac/knu/likeknu/repository/SuggestionRepository.java

@@ -0,0 +1,7 @@
+package ac.knu.likeknu.repository;
+
+import ac.knu.likeknu.domain.Suggestion;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface SuggestionRepository extends JpaRepository<Suggestion, Long> {
+}

src/main/java/ac/knu/likeknu/service/SuggestionService.java

@@ -0,0 +1,31 @@
+package ac.knu.likeknu.service;
+
+import ac.knu.likeknu.controller.dto.suggestion.request.SuggestionRequest;
+import ac.knu.likeknu.domain.Device;
+import ac.knu.likeknu.domain.Suggestion;
+import ac.knu.likeknu.exception.BusinessException;
+import ac.knu.likeknu.repository.DeviceRepository;
+import ac.knu.likeknu.repository.SuggestionRepository;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Transactional
+@Service
+public class SuggestionService {
+
+    private final DeviceRepository deviceRepository;
+    private final SuggestionRepository suggestionRepository;
+
+    public SuggestionService(DeviceRepository deviceRepository, SuggestionRepository suggestionRepository) {
+        this.deviceRepository = deviceRepository;
+        this.suggestionRepository = suggestionRepository;
+    }
+
+    public void createNewSuggestion(SuggestionRequest request) {
+        String deviceId = request.deviceId();
+        Device device = deviceRepository.findById(deviceId)
+                .orElseThrow(() -> new BusinessException(String.format("Device not found! [%s]", deviceId)));
+        Suggestion suggestion = Suggestion.of(device, request.content());
+        suggestionRepository.save(suggestion);
+    }
+}

src/main/resources/db/migration/mysql/V11__add_suggestion_table.sql

@@ -0,0 +1,8 @@
+CREATE TABLE IF NOT EXISTS suggestion
+(
+    id         BIGINT       NOT NULL AUTO_INCREMENT PRIMARY KEY,
+    content    VARCHAR(500) NOT NULL,
+    created_at DATETIME     NOT NULL,
+    device     VARCHAR(60),
+    FOREIGN KEY (device) REFERENCES device (id) ON DELETE SET NULL ON UPDATE SET NULL
+);