diff --git a/apps/gateway/src/federation/enrollment.service.ts b/apps/gateway/src/federation/enrollment.service.ts
index 03b89f7..27a84ce 100644
--- a/apps/gateway/src/federation/enrollment.service.ts
+++ b/apps/gateway/src/federation/enrollment.service.ts
@@ -256,8 +256,8 @@ export class EnrollmentService {
           .insert(federationAuditLog)
           .values({
             requestId: crypto.randomUUID(),
-            peerId: row?.peerId ?? 'unknown',
-            grantId: row?.grantId ?? 'unknown',
+            peerId: row?.peerId ?? null,
+            grantId: row?.grantId ?? null,
             verb: 'enrollment',
             resource: 'federation_grant',
             statusCode: