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    Repair Tenant Routing Drift

    1

    Diagnose and repair tenant routing, shard/region mapping, stale route caches, migrations, and asynchronous work.

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    Repair Tenant Routing Drift

    Repair Tenant Routing Drift

    Example session with this skill installed

    We are seeing intermittent 404s for Tenant A during our migration from us-east-1 to us-west-2. Requests hitting the API gateway seem to have stale shard mappings. Explain the drift.

    • Read your context and instructions
    • Compiled the repair tenant routing

    I have analyzed the reported intermittent 404s during your regional migration. The evidence suggests a cache-invalidation lag where the API Gateway's local route cache is not synchronized with the authoritative Shard Mapping Service during the migration state transition.

    Tenant Routing Drift Diagnosis

    ComponentState ObservedExpected StateDiscrepancy
    Shard Mapping DBMIGRATED (us-west-2)MIGRATED (us-west-2)None (Authoritative)
    API Gateway CacheACTIVE (us-east-1)MIGRATED (us-west-2)Stale Cache Entry (TTL not expired)
    Background JobsPENDING (us-east-1)MIGRATED (us-west-2)Snapshot captured mid-migration

    Invariant

    A tenant route resolution must query the authoritative Shard Mapping Service or a strictly versioned cache entry that matches the current migration epoch.

    Recommended Repair Pattern

    Implement a "Soft Fallback" during the migration window. If a request hits a shard and returns a 404, the gateway must force a cache refresh against the authoritative store before returning a failure to the client.

    // Proposed Guard Logic for Route Resolver
    async function resolveTenantRoute(tenantId: string): Promise<Route> {
      let route = await cache.get(`route:${tenantId}`);
      
      if (!route || route.status === 'MIGRATING') {
        // Force authoritative fetch if cache is stale or in transition
        route = await shardService.fetchAuthoritative(tenantId);
        await cache.set(`route:${tenantId}`, route, { ttl: 60 });
      }
      
      return route;
    }
    

    Next steps

    1. Reduce the TTL for the route:{tenantId} cache key to 30 seconds during the migration window.
    2. Add a Migration-Epoch header to internal requests to detect mismatched snapshots in background workers.
    3. Verify the fix by simulating a shard failover in the staging environment using the provided resolver logic.

    Connects securely to your tools. The creator never sees your data.

    What you get

    Identify stale cache keys causing incorrect tenant routing.Debug race conditions in multi-region shard migrations.Restore tenant isolation invariants in distributed architectures.Draft deterministic tests for concurrent route resolution bugs.

    About this skill

    Repair Tenant Routing Drift targets production and repository defects around diagnose and repair tenant routing, shard/region mapping, stale route caches, migrations, and asynchronous work.. It examines authoritative tenant-to-location mapping, request-time route resolution, cache keys and invalidation, background job route snapshots, migration generation/version binding, fallback and missing-tenant behavior, cross-tenant/shard safety checks, mixed-version rollout and observability, then establishes one explicit repair contract and focused deterministic validation.

    The skill works from repository access or partial evidence such as snippets, logs, configuration, traces, and architecture notes. It preserves existing product/security policy, avoids invented execution claims, and keeps production systems, real credentials, and deployment outside the validation path.

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