feat: nullable projectId, new ticket categories, improved create form

backend/src/main/java/com/srsystem/dto/CreateTicketRequest.java

@@ -2,11 +2,12 @@ package com.srsystem.dto;
 
 import com.srsystem.entity.enums.TicketCategory;
 import com.srsystem.entity.enums.TicketPriority;
+import jakarta.annotation.Nullable;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
 
 public record CreateTicketRequest(
-        @NotNull Long projectId,
+        @Nullable Long projectId,
         @NotNull TicketCategory category,
         @NotNull TicketPriority priority,
         @NotBlank String title,

backend/src/main/java/com/srsystem/entity/Ticket.java

@@ -28,7 +28,7 @@ public class Ticket extends BaseEntity {
     private Long ticketId;
 
     @ManyToOne(fetch = FetchType.LAZY)
-    @JoinColumn(name = "project_id", nullable = false)
+    @JoinColumn(name = "project_id")
     private Project project;
 
     @ManyToOne(fetch = FetchType.LAZY)

backend/src/main/java/com/srsystem/entity/enums/TicketCategory.java

@@ -4,5 +4,9 @@ public enum TicketCategory {
     BUG,
     FEATURE,
     SUPPORT,
-    QA
+    QA,
+    VACATION,
+    EXPENSE,
+    EQUIPMENT_REQUEST,
+    GENERAL
 }

backend/src/main/java/com/srsystem/service/TicketService.java

@@ -59,21 +59,22 @@ public class TicketService {
         Employee requester = employeeRepository.findById(requesterId)
                 .orElseThrow(() -> new BusinessException(ErrorCode.EMPLOYEE_NOT_FOUND));
         
-        Project project = projectRepository.findById(request.projectId())
-                .orElseThrow(() -> new BusinessException(ErrorCode.PROJECT_NOT_FOUND));
-
-        Ticket ticket = Ticket.builder()
-                .project(project)
+        Ticket.TicketBuilder builder = Ticket.builder()
                 .requester(requester)
                 .category(request.category())
                 .priority(request.priority())
                 .title(request.title())
                 .description(request.description())
                 .status(TicketStatus.OPEN)
-                .slaWarnFlag('N')
-                .build();
+                .slaWarnFlag('N');
 
-        Ticket saved = ticketRepository.save(ticket);
+        if (request.projectId() != null) {
+            Project project = projectRepository.findById(request.projectId())
+                    .orElseThrow(() -> new BusinessException(ErrorCode.PROJECT_NOT_FOUND));
+            builder.project(project);
+        }
+
+        Ticket saved = ticketRepository.save(builder.build());
         return toIssueTicket(saved);
     }
 

backend/src/main/resources/db/migration/V18__ticket_nullable_project.sql

@@ -0,0 +1,21 @@
+ALTER TABLE tb_ticket ALTER COLUMN project_id DROP NOT NULL;
+
+INSERT INTO tb_common_code (id, group_code, code_value, code_name, sort_order, is_active, created_at, updated_at)
+SELECT nextval('sq_common_codes'), 'TICKET_CATEGORY', 'FEATURE', '기능 요청', 2, 'Y', NOW(), NOW()
+WHERE NOT EXISTS (SELECT 1 FROM tb_common_code WHERE group_code = 'TICKET_CATEGORY' AND code_value = 'FEATURE');
+
+INSERT INTO tb_common_code (id, group_code, code_value, code_name, sort_order, is_active, created_at, updated_at)
+SELECT nextval('sq_common_codes'), 'TICKET_CATEGORY', 'VACATION', '휴가 신청', 5, 'Y', NOW(), NOW()
+WHERE NOT EXISTS (SELECT 1 FROM tb_common_code WHERE group_code = 'TICKET_CATEGORY' AND code_value = 'VACATION');
+
+INSERT INTO tb_common_code (id, group_code, code_value, code_name, sort_order, is_active, created_at, updated_at)
+SELECT nextval('sq_common_codes'), 'TICKET_CATEGORY', 'EXPENSE', '비용 청구', 6, 'Y', NOW(), NOW()
+WHERE NOT EXISTS (SELECT 1 FROM tb_common_code WHERE group_code = 'TICKET_CATEGORY' AND code_value = 'EXPENSE');
+
+INSERT INTO tb_common_code (id, group_code, code_value, code_name, sort_order, is_active, created_at, updated_at)
+SELECT nextval('sq_common_codes'), 'TICKET_CATEGORY', 'EQUIPMENT_REQUEST', '장비 요청', 7, 'Y', NOW(), NOW()
+WHERE NOT EXISTS (SELECT 1 FROM tb_common_code WHERE group_code = 'TICKET_CATEGORY' AND code_value = 'EQUIPMENT_REQUEST');
+
+INSERT INTO tb_common_code (id, group_code, code_value, code_name, sort_order, is_active, created_at, updated_at)
+SELECT nextval('sq_common_codes'), 'TICKET_CATEGORY', 'GENERAL', '일반 문의', 8, 'Y', NOW(), NOW()
+WHERE NOT EXISTS (SELECT 1 FROM tb_common_code WHERE group_code = 'TICKET_CATEGORY' AND code_value = 'GENERAL');