diff --git a/liquibase/changelog_user.xml b/liquibase/changelog_user.xml
index 55a569b13..e23defb24 100644
--- a/liquibase/changelog_user.xml
+++ b/liquibase/changelog_user.xml
@@ -15,4 +15,6 @@
     <include file="changes_user/feat_1684.sql" relativeToChangelogFile="true"/>
     <!-- Add feature_flag and user_feature_flag tables -->
     <include file="changes_user/feat_1694.sql" relativeToChangelogFile="true"/>
+    <!-- Seed 'api.announcements' notification type (issue #1729). -->
+    <include file="changes_user/feat_1729.sql" relativeToChangelogFile="true"/>
 </databaseChangeLog>
diff --git a/liquibase/changes_user/feat_1729.sql b/liquibase/changes_user/feat_1729.sql
new file mode 100644
index 000000000..6feb381c6
--- /dev/null
+++ b/liquibase/changes_user/feat_1729.sql
@@ -0,0 +1,15 @@
+-- Seed 'api.announcements' notification type (idempotent).
+INSERT INTO notification_type (id, description)
+VALUES ('api.announcements', 'API announcements')
+ON CONFLICT (id) DO NOTHING;
+
+-- Backfill subscriptions for users already opted in (idempotent).
+INSERT INTO notification_subscription (id, user_id, notification_type_id)
+SELECT gen_random_uuid()::text, u.id, 'api.announcements'
+FROM app_user u
+WHERE u.is_registered_to_receive_api_announcements
+  AND NOT EXISTS (
+      SELECT 1 FROM notification_subscription s
+      WHERE s.user_id = u.id
+        AND s.notification_type_id = 'api.announcements'
+  );