Use PositiveSmallIntegerField

src/documents/migrations/1050_customfield_extra_data_and_more.py

@@ -23,7 +23,7 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name="customfieldinstance",
             name="value_select",
-            field=models.IntegerField(null=True),
+            field=models.PositiveSmallIntegerField(null=True),
         ),
         migrations.AlterField(
             model_name="customfield",

src/documents/models.py

@@ -898,7 +898,7 @@ class CustomFieldInstance(models.Model):
 
     value_document_ids = models.JSONField(null=True)
 
-    value_select = models.IntegerField(null=True)
+    value_select = models.PositiveSmallIntegerField(null=True)
 
     class Meta:
         ordering = ("created",)