diff --git a/common/apps/organization/handler.py b/common/apps/organization/handler.py
index eb2be3e..3cbf2c7 100644
--- a/common/apps/organization/handler.py
+++ b/common/apps/organization/handler.py
@@ -14,17 +14,3 @@ def __init__(self, organization, owner):
     @abstractmethod
     def handle(self):
         pass
-
-
-class DeleteOrganizationHandlerBase:
-    """
-    The base class for Delete Organization Handler
-    Use by set DELETE_ORGANIZATION_HANDLER in Django setting file
-    """
-
-    def __init__(self, organization):
-        self._organization = organization
-
-    @abstractmethod
-    def handle(self):
-        pass
diff --git a/common/apps/organization/tasks.py b/common/apps/organization/tasks.py
index 2c13c78..b695092 100644
--- a/common/apps/organization/tasks.py
+++ b/common/apps/organization/tasks.py
@@ -51,15 +51,3 @@ def create_organization(id, name, slug_name, is_active, owner, created_at, updat
 
     if NewOrganizationHandler is not None:
         NewOrganizationHandler(organization, owner).handle()
-
-
-@task(name="spacedf.tasks.delete_organization", max_retries=3)
-@transaction.atomic
-def delete_organization(slug_name):
-    logger.info(f"delete_organization({slug_name})")
-    DeleteOrganizationHandler = get_delete_organization_handler()
-
-    organization = Organization.objects.get(schema_name=slug_name)
-    if DeleteOrganizationHandler is not None:
-        DeleteOrganizationHandler(organization).handle()
-    organization.delete(force_drop=True)
diff --git a/common/apps/organization_user/migrations/0002_organizationuser_avatar_and_more.py b/common/apps/organization_user/migrations/0002_organizationuser_avatar_and_more.py
index 7f6b020..b0d3775 100644
--- a/common/apps/organization_user/migrations/0002_organizationuser_avatar_and_more.py
+++ b/common/apps/organization_user/migrations/0002_organizationuser_avatar_and_more.py
@@ -5,7 +5,6 @@
 
 
 class Migration(migrations.Migration):
-
     dependencies = [
         ("organization_user", "0001_initial"),
     ]
diff --git a/common/apps/space/migrations/0002_space_is_default.py b/common/apps/space/migrations/0002_space_is_default.py
index 092c874..ec961ad 100644
--- a/common/apps/space/migrations/0002_space_is_default.py
+++ b/common/apps/space/migrations/0002_space_is_default.py
@@ -4,7 +4,6 @@
 
 
 class Migration(migrations.Migration):
-
     dependencies = [
         ("space", "0001_initial"),
     ]
diff --git a/common/apps/space_role/migrations/0003_spaceroleuser_is_default.py b/common/apps/space_role/migrations/0003_spaceroleuser_is_default.py
index 1adcdf7..85ebade 100644
--- a/common/apps/space_role/migrations/0003_spaceroleuser_is_default.py
+++ b/common/apps/space_role/migrations/0003_spaceroleuser_is_default.py
@@ -4,7 +4,6 @@
 
 
 class Migration(migrations.Migration):
-
     dependencies = [
         ("space_role", "0002_create_default_policies"),
     ]
diff --git a/common/utils/custom_fields.py b/common/utils/custom_fields.py
new file mode 100644
index 0000000..a2767f1
--- /dev/null
+++ b/common/utils/custom_fields.py
@@ -0,0 +1,31 @@
+import re
+
+from rest_framework import serializers
+from rest_framework.validators import UniqueValidator
+
+
+class HexCharField(serializers.CharField):
+    def __init__(self, length, unique=False, **kwargs):
+        self.length = length
+        self.format = re.compile(rf"^[a-fA-F0-9]{{{length}}}$")
+        self.unique = unique
+        super().__init__(**kwargs)
+
+    def bind(self, field_name, parent):
+        super().bind(field_name, parent)
+        if self.unique and hasattr(parent.Meta, "model"):
+            model = parent.Meta.model
+            self.validators.append(
+                UniqueValidator(
+                    queryset=model.objects.all(),
+                    message=f"Device with this {field_name} already exists.",
+                )
+            )
+
+    def to_internal_value(self, data):
+        value = super().to_internal_value(data)
+        if value and not self.format.fullmatch(value):
+            raise serializers.ValidationError(
+                f"Value must be {self.length} hex characters"
+            )
+        return value