Adding ability to update / patch by sku, adding uniqueness constraint violation checks

app/api/roles.py

@@ -81,6 +81,12 @@ async def update_role(
             status_code=status.HTTP_404_NOT_FOUND, detail="Role not found"
         )
     changes = payload.model_dump(exclude_unset=True)
+    if "name" in changes:
+        existing = await role_crud.get_by_name(db, changes["name"])
+        if existing is not None and existing.id != role.id:
+            raise HTTPException(
+                status_code=status.HTTP_409_CONFLICT, detail="Role already exists"
+            )
     role = await role_crud.update(db, role, changes)
     await audit_crud.log(
         db,