fix(backend): prevent org deletion from setting current_org_id to NULL (#12817)

enterprise/server/routes/org_models.py

@@ -45,6 +45,16 @@ class OrgAuthorizationError(OrgDeletionError):
         super().__init__(message)
 
 
+class OrphanedUserError(OrgDeletionError):
+    """Raised when deleting an org would leave users without any organization."""
+
+    def __init__(self, user_ids: list[str]):
+        self.user_ids = user_ids
+        super().__init__(
+            f'Cannot delete organization: {len(user_ids)} user(s) would have no remaining organization'
+        )
+
+
 class OrgNotFoundError(Exception):
     """Raised when organization is not found or user doesn't have access."""
 

enterprise/server/routes/orgs.py

@@ -23,6 +23,7 @@ from server.routes.org_models import (
     OrgPage,
     OrgResponse,
     OrgUpdate,
+    OrphanedUserError,
     RoleNotFoundError,
 )
 from server.services.org_member_service import OrgMemberService
@@ -304,7 +305,7 @@ async def get_me(
 @org_router.delete('/{org_id}', status_code=status.HTTP_200_OK)
 async def delete_org(
     org_id: UUID,
-    user_id: str = Depends(get_admin_user_id),
+    user_id: str = Depends(get_user_id),
 ) -> dict:
     """Delete an organization.
 
@@ -376,6 +377,19 @@ async def delete_org(
             status_code=status.HTTP_403_FORBIDDEN,
             detail=str(e),
         )
+    except OrphanedUserError as e:
+        logger.warning(
+            'Cannot delete organization: users would be orphaned',
+            extra={
+                'user_id': user_id,
+                'org_id': str(org_id),
+                'orphaned_users': e.user_ids,
+            },
+        )
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=str(e),
+        )
     except OrgDatabaseError as e:
         logger.error(
             'Database error during organization deletion',