feat(itam): device serial number must be unique

!13

app/itam/migrations/0012_alter_device_serial_number_alter_device_uuid.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.0.6 on 2024-05-28 06:33
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('itam', '0011_software_publisher'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='device',
+            name='serial_number',
+            field=models.CharField(blank=True, default=None, max_length=50, null=True, unique=True, verbose_name='Serial Number'),
+        ),
+    ]

app/itam/models/device.py

@@ -39,7 +39,8 @@ class Device(DeviceCommonFieldsName, SaveHistory):
         max_length = 50,
         default = None,
         null = True,
-        blank = True
+        blank = True,
+        unique = True,
         
     )