[EDIT] categoryテーブルにUser・削除フラグを追加しました

src/main/java/com/example/demo/app/domain/model/CategoryModel.java

@@ -3,6 +3,7 @@ package com.example.demo.app.domain.model;
 import java.util.List;
 
 import com.example.demo.app.infra.entity.CategoryEntity;
+import com.example.demo.app.infra.entity.UserEntity;
 
 import lombok.AllArgsConstructor;
 import lombok.Getter;
@@ -27,4 +28,15 @@ public class CategoryModel {
 		return categoryEntityList.stream().map(CategoryModel::convertFrom).toList();
 	}
 	
+	public static CategoryEntity convertTo(CategoryModel categoryModel, UserEntity userEntity) {
+		return new CategoryEntity(
+				categoryModel.getCategoryId(),
+				categoryModel.getCategoryName(),
+				categoryModel.getTransactionType(),
+				userEntity,
+				0,
+				null,
+				null);
+	}
+	
 }

src/main/java/com/example/demo/app/infra/entity/CategoryEntity.java

@@ -4,9 +4,12 @@ import java.util.List;
 
 import jakarta.persistence.Column;
 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.OneToMany;
 import jakarta.persistence.Table;
 
@@ -32,6 +35,13 @@ public class CategoryEntity {
 	@Column(name = "transaction_type", nullable = false)
 	private Integer transactionType;
 	
+	@ManyToOne(fetch = FetchType.LAZY)
+	@JoinColumn(name = "user_id")
+	private UserEntity userEntity;
+	
+	@Column(name = "delete_flag")
+	private Integer deleteFlag;
+	
 	@OneToMany(mappedBy = "categoryEntity")
 	private List<TransactionEntity> transactionEntity;
 	

src/main/java/com/example/demo/app/presentation/form/CategoryForm.java

@@ -25,4 +25,11 @@ public class CategoryForm {
 		return categoryModelList.stream().map(CategoryForm::convertFrom).toList();
 	}
 	
+	public static CategoryModel convertTo(CategoryForm categoryForm) {
+		return new CategoryModel(
+				categoryForm.getCategoryId(),
+				categoryForm.getCategoryName(),
+				categoryForm.getTransactionType());
+	}
+	
 }