diff --git a/dirs/ecommerce/migrations/20241114131226.sql b/dirs/ecommerce/migrations/20241114131226.sql
new file mode 100644
index 0000000..52b5e5a
--- /dev/null
+++ b/dirs/ecommerce/migrations/20241114131226.sql
@@ -0,0 +1,2 @@
+-- Modify "inventory" table
+ALTER TABLE `inventory` ADD CONSTRAINT `inventory_chk_1` CHECK (`quantity` >= 0);
diff --git a/dirs/ecommerce/migrations/atlas.sum b/dirs/ecommerce/migrations/atlas.sum
index 11320e0..5e69258 100644
--- a/dirs/ecommerce/migrations/atlas.sum
+++ b/dirs/ecommerce/migrations/atlas.sum
@@ -1,4 +1,4 @@
-h1:mQ4os5dvdZVxq9ucRsiEYty95umfc04MMDQfT68e+VI=
+h1:NpEy8HM4ZGHgJAWhU65tAJQPaSHCaaEipRBHfZzkY64=
 20230316085611.sql h1:br6W6LPEnnsejlz/7hRm9zthwStCzjN2vZkqVPxlmvo=
 20230316090502.sql h1:GfeRjkSeoCt3JVRtLQNa/r50lRfpAPXS7AqTU2ZNFgY=
 20230531091333_products_categories.sql h1:59q2M59dV5dJNv4Lyb2TAJz8V6HekgkLn9z4DoL98jA=
@@ -59,3 +59,4 @@ h1:mQ4os5dvdZVxq9ucRsiEYty95umfc04MMDQfT68e+VI=
 20241105131055.sql h1:Pa43oRSXYgYlTyRPmz+ifOUdjC37MBxXty/y6GLCaqk=
 20241107131023.sql h1:ZCiG0I6S1KZRirv89U4894V9ZBuG6ChLYDuPyWC098c=
 20241110130904.sql h1:qRQ+S6KPxiFyp8VxRMkZIFVop3rO1qrS3EJpKz2gjhw=
+20241114131226.sql h1:kQjVyuZaEewk+qpzGzSpj2Pwm6mJ6XWci4kBCXXdIY0=
diff --git a/dirs/ecommerce/schema.sql b/dirs/ecommerce/schema.sql
index b28a8c0..2259bab 100644
--- a/dirs/ecommerce/schema.sql
+++ b/dirs/ecommerce/schema.sql
@@ -88,7 +88,8 @@ CREATE TABLE `inventory` (
     INDEX `fulfillment_center_id` (`fulfillment_center_id`),
     INDEX `product_id` (`product_id`),
     CONSTRAINT `inventory_ibfk_1` FOREIGN KEY (`product_id`) REFERENCES `products` (`id`) ON UPDATE NO ACTION ON DELETE CASCADE,
-    CONSTRAINT `inventory_ibfk_2` FOREIGN KEY (`fulfillment_center_id`) REFERENCES `fulfillment_centers` (`id`) ON UPDATE NO ACTION ON DELETE CASCADE
+    CONSTRAINT `inventory_ibfk_2` FOREIGN KEY (`fulfillment_center_id`) REFERENCES `fulfillment_centers` (`id`) ON UPDATE NO ACTION ON DELETE CASCADE,
+    CHECK (`quantity` >= 0)
 ) CHARSET utf8mb4 COLLATE utf8mb4_0900_ai_ci COMMENT 'Table for managing inventory levels of products at various fulfillment centers';
 
 -- Create 'orders' table