diff --git a/apps/rebreak-native/hooks/useDomainSubmissionRealtime.ts b/apps/rebreak-native/hooks/useDomainSubmissionRealtime.ts
index 7557f7e..62d2adb 100644
--- a/apps/rebreak-native/hooks/useDomainSubmissionRealtime.ts
+++ b/apps/rebreak-native/hooks/useDomainSubmissionRealtime.ts
@@ -37,7 +37,7 @@ export function useDomainSubmissionRealtime(
             event: "*",
             schema: "rebreak",
             table: "domain_submissions",
-            filter: `submitter_id=eq.${myId}`,
+            filter: `user_id=eq.${myId}`,
           },
           () => onChange(),
         )
diff --git a/backend/prisma/migrations/20260511_fix_realtime_user_custom_domains/migration.sql b/backend/prisma/migrations/20260511_fix_realtime_user_custom_domains/migration.sql
new file mode 100644
index 0000000..3406319
--- /dev/null
+++ b/backend/prisma/migrations/20260511_fix_realtime_user_custom_domains/migration.sql
@@ -0,0 +1,9 @@
+-- Enable Supabase Realtime for user_custom_domains table.
+-- Fixes the remaining CHANNEL_ERROR in the domainRealtime subscription:
+-- useDomainSubmissionRealtime.ts subscribes to rebreak.user_custom_domains, but
+-- that table was never added to the supabase_realtime publication — so the whole
+-- channel (which also covers domain_submissions + notifications) failed with
+-- CHANNEL_ERROR and reconnect-looped every 3s.
+-- (Companion fix in the RN code: the domain_submissions filter used a non-existent
+-- column `submitter_id` — corrected to `user_id`.)
+ALTER PUBLICATION supabase_realtime ADD TABLE rebreak.user_custom_domains;