diff --git a/migrations/20230623-rename-submissions-to-posts.sql b/migrations/20230623-rename-submissions-to-posts.sql
index 9e027b15cf..c062783931 100644
--- a/migrations/20230623-rename-submissions-to-posts.sql
+++ b/migrations/20230623-rename-submissions-to-posts.sql
@@ -14,3 +14,15 @@ alter table subactions rename constraint subactions_submission_fkey to subaction
 alter table subscriptions rename constraint subscription_submission_fkey to subscription_post_fkey;
 alter table post_option_votes rename constraint vote_submission_fkey to vote_post_fkey;
 alter table votes rename constraint vote_submission_key to vote_post_key;
+
+drop function bump_utc;
+
+CREATE FUNCTION public.bump_utc(public.posts) RETURNS integer
+    LANGUAGE sql IMMUTABLE STRICT
+    AS $_$
+      SELECT CREATED_UTC
+      FROM comments
+      WHERE parent_post = $1.id
+      ORDER BY created_utc desc
+      LIMIT 1
+      $_$;