chore: add invoice and subscription entities

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

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+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;
+}

src/modules/invoices/enums/invoice-status.enum.ts

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+export enum InvoiceStatus {
+  PENDING = "PENDING",
+  PAID = "PAID",
+  CANCELED = "CANCELED",
+}

src/modules/invoices/invoices.controller.ts

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+import { Controller } from "@nestjs/common";
+
+@Controller("invoices")
+export class InvoicesController {}

src/modules/invoices/invoices.module.ts

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+import { Module } from "@nestjs/common";
+import { TypeOrmModule } from "@nestjs/typeorm";
+
+import { Invoice } from "./entities/invoice.entity";
+import { InvoicesController } from "./invoices.controller";
+import { InvoicesService } from "./providers/invoices.service";
+import { InvoicesRepository } from "./repositories/invoices.repository";
+
+@Module({
+  imports: [TypeOrmModule.forFeature([Invoice])],
+  providers: [InvoicesService, InvoicesRepository],
+  controllers: [InvoicesController],
+  exports: [InvoicesService],
+})
+export class InvoicesModule {}

src/modules/invoices/providers/invoices.service.ts

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+import { Injectable } from "@nestjs/common";
+
+@Injectable()
+export class InvoicesService {}

src/modules/invoices/repositories/invoices.repository.ts

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+import { Injectable } from "@nestjs/common";
+import { InjectRepository } from "@nestjs/typeorm";
+import { Repository } from "typeorm";
+
+import { Invoice } from "../entities/invoice.entity";
+
+@Injectable()
+export class InvoicesRepository extends Repository<Invoice> {
+  constructor(@InjectRepository(Invoice) invoicesRepository: Repository<Invoice>) {
+    super(invoicesRepository.target, invoicesRepository.manager, invoicesRepository.queryRunner);
+  }
+}