DEV: Add dates

Author: keegangeorge

app/controllers/discourse_ai/sentiment/sentiment_controller.rb

@@ -41,6 +41,7 @@ def posts
             p.cooked as post_cooked,
             p.user_id,
             p.post_number,
+            p.created_at AS created_at,
             u.username,
             u.name,
             u.uploaded_avatar_id,

app/serializers/ai_sentiment_post_serializer.rb

@@ -11,7 +11,8 @@ class AiSentimentPostSerializer < ApplicationSerializer
              :excerpt,
              :sentiment,
              :truncated,
-             :category
+             :category,
+             :created_at
 
   def avatar_template
     User.avatar_template(object.username, object.uploaded_avatar_id)