add message group id for post archives

app/models/pool_archive.rb

@@ -59,7 +59,7 @@ class PoolArchive < ActiveRecord::Base
       category: pool.category
     }
     msg = "add pool version\n#{json.to_json}"
-    sqs_service.send_message(msg)
+    sqs_service.send_message(msg, message_group_id: "#{pool.id}")
   end
 
   def build_diff(other = nil)

app/models/post_archive.rb

@@ -74,7 +74,7 @@ class PostArchive < ActiveRecord::Base
           "tags" => post.tag_string
         }
         msg = "add post version\n#{json.to_json}"
-        sqs_service.send_message(msg)
+        sqs_service.send_message(msg, message_group_id: "#{post.id}")
       end
     end
   end