diff --git a/services/catarse/db/migrate/20221209104357_update_notification_count_functions.rb b/services/catarse/db/migrate/20221209104357_update_notification_count_functions.rb
new file mode 100644
index 000000000..892129dd6
--- /dev/null
+++ b/services/catarse/db/migrate/20221209104357_update_notification_count_functions.rb
@@ -0,0 +1,34 @@
+class UpdateNotificationCountFunctions < ActiveRecord::Migration[6.1]
+  def up
+  def change
+    execute <<-SQL
+      CREATE OR REPLACE FUNCTION public.delivered_count(project_post project_posts) RETURNS bigint
+      LANGUAGE sql AS $$
+       select count(distinct notification_user) from sendgrid_events where notification_type = 'ProjectPostNotification' and notification_id IN
+       (select ppn.id from project_post_notifications ppn join project_posts pp on pp.id = ppn.project_post_id where pp.id = project_post.id) and event = 'delivered';
+      $$;
+
+      CREATE OR REPLACE FUNCTION public.open_count(project_post project_posts) RETURNS bigint
+      LANGUAGE sql AS $$
+       select count(distinct notification_user) from sendgrid_events where notification_type = 'ProjectPostNotification' and notification_id IN
+       (select ppn.id from project_post_notifications ppn join project_posts pp on pp.id = ppn.project_post_id where pp.id = project_post.id) and event = 'open';
+      $$;
+    SQL
+  end
+
+  def down
+    execute <<-SQL
+      CREATE OR REPLACE FUNCTION public.delivered_count(project_post project_posts) RETURNS bigint
+      LANGUAGE sql AS $$
+       select count(distinct notification_user) from sendgrid_events where notification_id IN
+       (select ppn.id from project_post_notifications ppn join project_posts pp on pp.id = ppn.project_post_id where pp.id = project_post.id) and event = 'delivered';
+      $$;
+
+      CREATE OR REPLACE FUNCTION public.open_count(project_post project_posts) RETURNS bigint
+      LANGUAGE sql AS $$
+       select count(distinct notification_user) from sendgrid_events where notification_id IN
+       (select ppn.id from project_post_notifications ppn join project_posts pp on pp.id = ppn.project_post_id where pp.id = project_post.id) and event = 'open';
+      $$;
+    SQL
+  end
+end