diff --git a/src/modules/cart/providers/cart.service.ts b/src/modules/cart/providers/cart.service.ts
index 464f5e2..d6cb382 100644
--- a/src/modules/cart/providers/cart.service.ts
+++ b/src/modules/cart/providers/cart.service.ts
@@ -19,6 +19,7 @@ import { Cart, CartItem } from '../interfaces/cart.interface';
 import { CouponService } from 'src/modules/coupons/providers/coupon.service';
 import { OrderCouponDetail } from 'src/modules/orders/interface/order-status';
 import { CouponType } from 'src/modules/coupons/interface/coupon';
+import { Order } from '../../orders/entities/order.entity';
 
 @Injectable()
 export class CartService {
@@ -399,17 +400,19 @@ export class CartService {
 
     // Check maxUsesPerUser limit by counting how many orders this user has with this coupon
     if (coupon.maxUsesPerUser) {
-      const result = await this.em.getConnection().execute<{ count: string }>(
-        `SELECT COUNT(*) as count 
+      // Use native query for JSONB field access with proper parameter binding
+      const knex = this.em.getKnex();
+      const result = await knex.raw(
+        `SELECT COUNT(*)::int as count 
          FROM orders 
-         WHERE user_id = $1 
+         WHERE user_id = ? 
          AND coupon_detail IS NOT NULL 
-         AND coupon_detail->>'couponId' = $2 
+         AND coupon_detail->>'couponId' = ? 
          AND deleted_at IS NULL`,
         [userId, coupon.id],
       );
 
-      const userCouponUsageCount = parseInt((result[0] as { count: string })?.count || '0', 10);
+      const userCouponUsageCount = result.rows?.[0]?.count ?? result[0]?.count ?? 0;
 
       if (userCouponUsageCount >= coupon.maxUsesPerUser) {
         throw new BadRequestException(
@@ -594,11 +597,7 @@ export class CartService {
   /**
    * Set description for cart
    */
-  async setDescription(
-    userId: string,
-    restaurantId: string,
-    setDescriptionDto: SetDescriptionDto,
-  ): Promise<Cart> {
+  async setDescription(userId: string, restaurantId: string, setDescriptionDto: SetDescriptionDto): Promise<Cart> {
     const cart = await this.findOneOrFail(userId, restaurantId);
 
     cart.description = setDescriptionDto.description;