diff --git a/dirs/ecommerce/migrations/20240801083707.sql b/dirs/ecommerce/migrations/20240801083707.sql
new file mode 100644
index 0000000..5388b90
--- /dev/null
+++ b/dirs/ecommerce/migrations/20240801083707.sql
@@ -0,0 +1,2 @@
+-- Modify "users" table
+ALTER TABLE `users` ADD UNIQUE INDEX `user_name` (`user_name`);
diff --git a/dirs/ecommerce/migrations/atlas.sum b/dirs/ecommerce/migrations/atlas.sum
index 2c5f53c..5b651cc 100644
--- a/dirs/ecommerce/migrations/atlas.sum
+++ b/dirs/ecommerce/migrations/atlas.sum
@@ -1,4 +1,4 @@
-h1:ag/hSSF2oVKFPE9F/IplLMOPlyvQd0gXcpVyLHhXv0U=
+h1:Ap7xMN9V1zyLgjBJwn9epFduJ1QnnCkyJgTxoacsNjc=
 20230316085611.sql h1:br6W6LPEnnsejlz/7hRm9zthwStCzjN2vZkqVPxlmvo=
 20230316090502.sql h1:GfeRjkSeoCt3JVRtLQNa/r50lRfpAPXS7AqTU2ZNFgY=
 20230531091333_products_categories.sql h1:59q2M59dV5dJNv4Lyb2TAJz8V6HekgkLn9z4DoL98jA=
@@ -28,3 +28,4 @@ h1:ag/hSSF2oVKFPE9F/IplLMOPlyvQd0gXcpVyLHhXv0U=
 20240723130918.sql h1:7UFf+5hmmm/hJZdmF1lvHCz+GYQKbSkxAUK6Q41kVXs=
 20240725130853.sql h1:8wHRNNINenYDpavChvcXopJj7i2i88dKydkPoZ+3biE=
 20240728130515.sql h1:f32S9I3rYZ1KIUsnLpIyCMc/nxv2U8AqCmpA/95S8ls=
+20240801083707.sql h1:87RLzlaeNBXjfXtSlg3G/IAPqye2IeKogJCJTvpPTXA=
diff --git a/dirs/ecommerce/schema.sql b/dirs/ecommerce/schema.sql
index 7b50534..988fde7 100644
--- a/dirs/ecommerce/schema.sql
+++ b/dirs/ecommerce/schema.sql
@@ -12,7 +12,8 @@ CREATE TABLE `users` (
 `last_login` timestamp NULL,
 `address` varchar(255) NULL,
 PRIMARY KEY (`id`),
-UNIQUE INDEX `email` (`email`)
+UNIQUE INDEX `email` (`email`),
+UNIQUE INDEX `user_name` (`user_name`)
 ) CHARSET utf8mb4 COLLATE utf8mb4_0900_ai_ci;
 
 -- Create 'categories' table