chore: add invoice and subscription entities

src/modules/invoices/entities/invoice.entity.ts

@@ -0,0 +1,24 @@
+import { Column, Entity, ManyToOne } from "typeorm";
+
+import { BaseEntity } from "../../../common/entities/base.entity";
+import { SubscriptionPlan } from "../../subscriptions/entities/subscription.entity";
+import { User } from "../../users/entities/user.entity";
+import { InvoiceStatus } from "../enums/invoice-status.enum";
+
+@Entity()
+export class Invoice extends BaseEntity {
+  @ManyToOne(() => User, (user) => user.invoices, { nullable: true, onDelete: "RESTRICT" })
+  user: User;
+
+  @ManyToOne(() => SubscriptionPlan, { nullable: true, onDelete: "SET NULL" })
+  subscriptionPlan?: SubscriptionPlan;
+
+  @Column({ type: "decimal", precision: 10, scale: 2, nullable: false })
+  amount: number;
+
+  @Column({ type: "enum", enum: InvoiceStatus, default: InvoiceStatus.PENDING })
+  status: InvoiceStatus;
+
+  @Column({ type: "timestamp", nullable: true })
+  paidAt?: Date;
+}