- feat: make username field unique for users

Author: koladev32

api/user/models.py

@@ -41,7 +41,7 @@ def create_superuser(self, username, email, password):
 
 
 class User(AbstractBaseUser, PermissionsMixin):
-    username = models.CharField(db_index=True, max_length=255)
+    username = models.CharField(db_index=True, max_length=255, unique=True)
     email = models.EmailField(db_index=True, unique=True)
     is_active = models.BooleanField(default=True)
     is_staff = models.BooleanField(default=False)