by descending post id

db/migrate/20250813000020_create_index_on_posts_posted_at_nulls_last.rb

@@ -0,0 +1,15 @@
+class CreateIndexOnPostsPostedAtNullsLast < ActiveRecord::Migration[7.2]
+  def up
+    execute <<-SQL
+      CREATE INDEX index_domain_posts_on_posted_at_desc_nulls_last
+      ON domain_posts
+      USING BTREE
+      (posted_at DESC NULLS LAST)
+    SQL
+  end
+  def down
+    execute <<-SQL
+      DROP INDEX index_domain_posts_on_posted_at_desc_nulls_last
+    SQL
+  end
+end

db/structure.sql

@@ -4453,6 +4453,13 @@ CREATE INDEX index_domain_posts_ib_aux_on_ib_id ON public.domain_posts_ib_aux US
 CREATE INDEX index_domain_posts_on_posted_at ON public.domain_posts USING btree (posted_at);
 
 
+--
+-- Name: index_domain_posts_on_posted_at_desc_nulls_last; Type: INDEX; Schema: public; Owner: -
+--
+
+CREATE INDEX index_domain_posts_on_posted_at_desc_nulls_last ON public.domain_posts USING btree (posted_at DESC NULLS LAST);
+
+
 --
 -- Name: index_domain_posts_on_type; Type: INDEX; Schema: public; Owner: -
 --
@@ -5885,6 +5892,7 @@ ALTER TABLE ONLY public.domain_twitter_tweets
 SET search_path TO "$user", public;
 
 INSERT INTO "schema_migrations" (version) VALUES
+('20250813000020'),
 ('20250812215907'),
 ('20250812214902'),
 ('20250812214415'),