Review all code in packages/mongodb

[Copilot]

Comprehensive code review of the MongoDB World implementation for the Workflow DevKit.

Summary

The implementation is production-ready and follows CLAUDE.md patterns correctly. No code changes required.

Findings

✅ Correct Patterns

• ULID generation with prefixes (wrun_, wevt_, msg_, chnk_)
• WorkflowAPIError with proper status codes (404, 409)
• Timestamp idempotency (startedAt only set once)
• cleanMongoDoc() null → undefined conversion
• Atomic upsert for idempotent step creation
• Events sorted ascending (oldest first) for replay

✅ Production Queue

• Lock management with token verification
• Exponential backoff with jitter
• Graceful shutdown with in-flight tracking
• Stuck message recovery
• Dual-mode: Change Streams + polling fallback

✅ Security

• Credential masking in logs
• Zod input validation
• No injection vulnerabilities

⚠️ Minor (Non-blocking)

• Unnecessary dynamic import of mongodb in queue.ts (already statically imported)
• any types in filter objects (could use Filter<T>)
• 60s idempotency TTL vs CLAUDE.md's 5s (intentional, documented in README)

Original prompt

review all the code in packages/mongodb

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