docs(webapp): trim hot-path comment, note region must stay whereTransform-free

Author: nicktrn

apps/webapp/app/runEngine/services/triggerTask.server.ts

@@ -361,10 +361,10 @@ export class RunEngineTriggerTaskService {
           const baseWorkerQueue = workerQueueResult?.masterQueue;
           const enableFastPath = workerQueueResult?.enableFastPath ?? false;
 
-          // Plan-aware compute migration: rewrite the resolved region to its
-          // compute backing for enrolled orgs. Reads the in-memory global-flags
-          // snapshot (no DB query). Gate the first read on the registry so a cold
-          // replica never serves a default over a real flag value.
+          // Rewrite the region to its compute backing for migration-enrolled orgs,
+          // from the in-memory flag snapshot (no DB query). The isLoaded gates only
+          // block during cold start so the first request can't serve a default over
+          // a real flag; once warm they're a synchronous no-op.
           if (!globalFlagsRegistry.isLoaded) {
             await globalFlagsRegistry.waitUntilReady(env.GLOBAL_FLAGS_READY_TIMEOUT_MS);
           }

apps/webapp/app/v3/querySchemas.ts

@@ -197,6 +197,7 @@ export const runsSchema: TableSchema = {
         description: "Region",
         example: "us-east-1",
       }),
+      // No whereTransform: the expression drives WHERE too, so pre-region rows still match.
       expression: "multiIf(region != '', region, startsWith(worker_queue, 'cm'), NULL, worker_queue)",
     },