Rework Expenses resource (#3)

Co-authored-by: Joe Arndt <jmarndt@users.noreply.github.com>
Reviewed-on: #3

src/expenses/entities/expense.entity.ts

@@ -0,0 +1,39 @@
+import { Column, Entity, JoinTable, ManyToMany, ManyToOne, PrimaryGeneratedColumn } from 'typeorm';
+import { Tag } from '../../tags/entities/tag.entity';
+import { SubCategory } from '../../sub-categories/entities/sub-category.entity';
+import { Category } from '../../categories/entities/category.entity';
+import { Merchant } from '../../merchants/entities/merchant.entity';
+
+@Entity()
+export class Expense {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  year: string;
+
+  @Column()
+  month: string;
+
+  @Column()
+  day: string;
+
+  @Column()
+  cents: number;
+
+  @Column({ nullable: true })
+  description: string;
+
+  @ManyToOne(() => Category, { eager: true })
+  category: Category;
+
+  @ManyToOne(() => SubCategory, { nullable: true, eager: true })
+  subCategory: SubCategory;
+
+  @ManyToOne(() => Merchant, { nullable: true, eager: true })
+  merchant: Merchant;
+
+  @ManyToMany(() => Tag, { nullable: true, eager: true })
+  @JoinTable()
+  tags: Tag[];
+}