fix(newsletter): Improve newsletter sending route error handling and configuration

[codeunia-dev]

• Add validation for Resend API key before initializing client
• Move Resend client initialization inside the route handler
• Add explicit error response for missing API key configuration
• Improve error handling and configuration checks
• Ensure secure and robust newsletter sending process

Summary by CodeRabbit

• Bug Fixes
  • Improved error handling for newsletter sending. The system now validates required API credentials when needed and returns an appropriate error response if configuration is missing.

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
codeunia	Building	Preview	Comment	Nov 1, 2025 9:16am

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Resend email client initialization moved from module scope into the POST handler with a guard clause that validates RESEND_API_KEY presence before instantiation, returning a 500 error if the key is missing.

Changes

Cohort / File(s)	Summary
Lazy Resend initialization with validation app/api/admin/newsletter/send/route.ts	Relocate Resend client instantiation into POST handler with RESEND_API_KEY environment variable check; return 500 error response if key absent

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

• Verify the guard clause correctly prevents instantiation when RESEND_API_KEY is undefined
• Confirm error response format and status code alignment with API contract
• Check that no initialization side effects are lost by moving from module scope to handler scope

Poem

🐰 A rabbit hops with care,
Lazy init declares,
Guard the key so none beware,
Error caught in mid-air! 🎯

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/newsletter

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between a98b071 and b58b82f.

📒 Files selected for processing (1)

• app/api/admin/newsletter/send/route.ts (3 hunks)

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