Add all database tables with relations

software/backend/models/categories.model.ts

@@ -1,7 +1,14 @@
-import { Table, Column, Model, PrimaryKey, AutoIncrement } from 'sequelize-typescript';
+import { Table, Column, Model, BelongsTo, ForeignKey } from 'sequelize-typescript';
+import { Products } from './products.model';
 
 @Table
 export class Categories extends Model {
   @Column
   name: string
+
+  @ForeignKey(() => Products)
+  productId: number
+
+  @BelongsTo(() => Products)
+  product: Products
 }