Fix mobile validation, cascade delete for businesses/categories, and DB error handling.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/common/utils/business-cascade.util.ts

@@ -0,0 +1,43 @@
+import { NotFoundException } from '@nestjs/common';
+import { EntityManager } from 'typeorm';
+import { AttributeDefinitionEntity } from '../../entities/attribute-definition.entity';
+import { BookingEntity } from '../../entities/booking.entity';
+import { BusinessAttributeValueEntity } from '../../entities/business-attribute-value.entity';
+import { BusinessCategoryEntity } from '../../entities/business-category.entity';
+import { BusinessServiceEntity } from '../../entities/business-service.entity';
+import { BusinessEntity } from '../../entities/business.entity';
+import { ServiceTemplateEntity } from '../../entities/service-template.entity';
+
+/** Remove a business and all rows that block FK deletes in production DB. */
+export async function deleteBusinessCascade(
+  manager: EntityManager,
+  businessId: string,
+): Promise<void> {
+  await manager.delete(BookingEntity, { businessId });
+  await manager.delete(BusinessServiceEntity, { businessId });
+  await manager.delete(BusinessAttributeValueEntity, { businessId });
+
+  const result = await manager.delete(BusinessEntity, businessId);
+  if (!result.affected) {
+    throw new NotFoundException('Business not found');
+  }
+}
+
+/** Remove a category after all its businesses and catalog rows are cleared. */
+export async function deleteCategoryCascade(
+  manager: EntityManager,
+  categoryId: string,
+  businessIds: string[],
+): Promise<void> {
+  for (const businessId of businessIds) {
+    await deleteBusinessCascade(manager, businessId);
+  }
+
+  await manager.delete(ServiceTemplateEntity, { categoryId });
+  await manager.delete(AttributeDefinitionEntity, { categoryId });
+
+  const result = await manager.delete(BusinessCategoryEntity, categoryId);
+  if (!result.affected) {
+    throw new NotFoundException('Business category not found');
+  }
+}