first commit

api/src/entities/Merchant.ts

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+import { Column, CreateDateColumn, Entity, ManyToOne, PrimaryGeneratedColumn, UpdateDateColumn } from 'typeorm';
+import { User } from './User.js';
+
+@Entity('merchants')
+export class Merchant {
+  @PrimaryGeneratedColumn('uuid')
+  id!: string;
+
+  @Column({ type: 'varchar', length: 120 })
+  name!: string;
+
+  @Column({ type: 'varchar', length: 30, default: 'MERCHANT' })
+  kind!: 'MERCHANT' | 'SERVICE_PROVIDER' | 'OTHER';
+
+  @Column({ type: 'text', nullable: true })
+  notes!: string | null;
+
+  @Column({ type: 'boolean', default: true })
+  isActive!: boolean;
+
+  @CreateDateColumn({ type: 'datetime' })
+  createdAt!: Date;
+
+  @UpdateDateColumn({ type: 'datetime' })
+  updatedAt!: Date;
+
+  @ManyToOne(() => User, { onDelete: 'CASCADE' })
+  user!: User;
+}