first commit

api/src/entities/Category.ts

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+import { Column, CreateDateColumn, Entity, ManyToOne, OneToMany, PrimaryGeneratedColumn } from 'typeorm';
+import { Expense } from './Expense.js';
+import { User } from './User.js';
+
+@Entity('categories')
+export class Category {
+  @PrimaryGeneratedColumn('uuid')
+  id!: string;
+
+  @Column({ type: 'varchar', length: 80 })
+  name!: string;
+
+  @Column({ type: 'varchar', length: 32, default: '#0d6efd' })
+  color!: string;
+
+  @Column({ type: 'boolean', default: false })
+  isSystem!: boolean;
+
+  @CreateDateColumn({ type: 'datetime' })
+  createdAt!: Date;
+
+  @ManyToOne(() => User, (user) => user.categories, { nullable: true, onDelete: 'CASCADE' })
+  user!: User | null;
+
+  @OneToMany(() => Expense, (expense) => expense.category)
+  expenses!: Expense[];
+}