feat(routes,email): persist system DNS routes with runtime hydration and add reusable email ops DNS helpers

ts_migrations/index.ts

@@ -45,6 +45,33 @@ async function migrateTargetProfileTargetHosts(ctx: {
   ctx.log.log('info', `rename-target-profile-host-to-ip: migrated ${migrated} profile(s)`);
 }
 
+async function backfillSystemRouteKeys(ctx: {
+  mongo?: { collection: (name: string) => any };
+  log: { log: (level: 'info', message: string) => void };
+}): Promise<void> {
+  const collection = ctx.mongo!.collection('RouteDoc');
+  const cursor = collection.find({
+    origin: { $in: ['config', 'email', 'dns'] },
+    systemKey: { $exists: false },
+    'route.name': { $type: 'string' },
+  });
+  let migrated = 0;
+
+  for await (const doc of cursor) {
+    const origin = typeof (doc as any).origin === 'string' ? (doc as any).origin : undefined;
+    const routeName = typeof (doc as any).route?.name === 'string' ? (doc as any).route.name.trim() : '';
+    if (!origin || !routeName) continue;
+
+    await collection.updateOne(
+      { _id: (doc as any)._id },
+      { $set: { systemKey: `${origin}:${routeName}` } },
+    );
+    migrated++;
+  }
+
+  ctx.log.log('info', `backfill-system-route-keys: migrated ${migrated} route(s)`);
+}
+
 /**
  * Create a configured SmartMigration runner with all dcrouter migration steps registered.
  *
@@ -134,6 +161,12 @@ export async function createMigrationRunner(
     .description('Repair TargetProfileDoc.targets host→ip migration for already-upgraded installs')
     .up(async (ctx) => {
       await migrateTargetProfileTargetHosts(ctx);
+    })
+    .step('backfill-system-route-keys')
+    .from('13.17.4').to('13.18.0')
+    .description('Backfill RouteDoc.systemKey for persisted config/email/dns routes')
+    .up(async (ctx) => {
+      await backfillSystemRouteKeys(ctx);
     });
 
   return migration;