Fix payment enrollment validator query formatting

src/payments/services/payment-enrollment-validator.service.ts

@@ -0,0 +1,26 @@
+import { Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { Payment } from '../entities/payment.entity';
+
+@Injectable()
+export class PaymentEnrollmentValidatorService {
+  constructor(
+    @InjectRepository(Payment)
+    private readonly paymentRepo: Repository<Payment>,
+  ) {}
+
+  async validateEnrollmentExists(enrollmentId: string): Promise<boolean> {
+    if (!enrollmentId) return true;
+    const result = await this.paymentRepo.query('SELECT id FROM enrollments WHERE id = $1', [
+      enrollmentId,
+    ]);
+    return result.length > 0;
+  }
+
+  async findOrphanedPayments(): Promise<Payment[]> {
+    return this.paymentRepo.query(
+      'SELECT p.* FROM payments p LEFT JOIN enrollments e ON e.id = p."enrollmentId" WHERE p."enrollmentId" IS NOT NULL AND e.id IS NULL',
+    );
+  }
+}