first commit

api/src/entities/Expense.ts

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+import { Column, CreateDateColumn, Entity, ManyToOne, OneToMany, PrimaryGeneratedColumn, UpdateDateColumn } from 'typeorm';
+import { Category } from './Category.js';
+import { Proof } from './Proof.js';
+import { User } from './User.js';
+import { decimalTransformer } from '../utils/decimal.js';
+
+@Entity('expenses')
+export class Expense {
+  @PrimaryGeneratedColumn('uuid')
+  id!: string;
+
+  @Column({ type: 'varchar', length: 140 })
+  title!: string;
+
+  @Column({ type: 'text', nullable: true })
+  description!: string | null;
+
+  @Column({ type: 'decimal', precision: 12, scale: 2, transformer: decimalTransformer })
+  amount!: number;
+
+  @Column({ type: 'date' })
+  expenseDate!: string;
+
+  @Column({ type: 'varchar', length: 80, nullable: true })
+  merchant!: string | null;
+
+  @Column({ type: 'varchar', length: 50, nullable: true })
+  paymentMethod!: string | null;
+
+  @Column({ type: 'varchar', length: 12, default: 'PLN' })
+  currency!: string;
+
+  @Column({ type: 'boolean', default: false })
+  possibleDuplicate!: boolean;
+
+  @CreateDateColumn({ type: 'datetime' })
+  createdAt!: Date;
+
+  @UpdateDateColumn({ type: 'datetime' })
+  updatedAt!: Date;
+
+  @ManyToOne(() => User, (user) => user.expenses, { onDelete: 'CASCADE' })
+  user!: User;
+
+  @ManyToOne(() => Category, (category) => category.expenses, { eager: true, onDelete: 'RESTRICT' })
+  category!: Category;
+
+  @OneToMany(() => Proof, (proof) => proof.expense, { eager: true, cascade: true })
+  proofs!: Proof[];
+}