feat: add credits migration script to migrate legacy key credits to credits table

[Flo4604]

What does this PR do?

Adds a new migration command into our cli to migrate the keys from the old schema to the new schema.
This can be run whenever we want, worst case we just rollback the code without too many issues.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Chore (refactoring code, technical debt, workflow improvements)
• Enhancement (small improvements)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How should this be tested?

Create keys using our old structure best case in main before switching to this branch.

Then run the script and check if you can validate the key and use all the endpoints and see the correct credit data in all endpoints e.g listKeys getKey whoAmi verifyKey and so on.

Checklist

Required

• Filled out the "How to test" section in this PR
• Read Contributing Guide
• Self-reviewed my own code
• Commented on my code in hard-to-understand areas
• Ran pnpm build
• Ran pnpm fmt
• Checked for warnings, there are none
• Removed all console.logs
• Merged the latest changes from main onto my branch with git pull origin main
• My changes don't cause any responsiveness issues

Appreciated

• If a UI change was made: Added a screen recording or screenshots to this PR
• Updated the Unkey Docs if changes were necessary

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Project	Deployment	Preview	Comments	Updated (UTC)
dashboard	Ready	Preview	Comment	Nov 4, 2025 5:16pm

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
engineering	Ignored	Preview		Nov 4, 2025 5:16pm

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⚠️ No Changeset found

Latest commit: 34b0fb2

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[Flo4604]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat: add docs #4205
• feat: add credits migration script to migrate legacy key credits to credits table #4204 👈 (View in Graphite)
• feat: add dashboard changes for new key credits #4199
• feat: update refill workflow for identity-based credits #4194
• feat: add identity-based credits Go services and v2 API routes #4193
• feat: add identity-based credits OpenAPI specifications #4192
• feat: use new credits tables in API v1 #4191
• feat: add identity-based credits schema and database changes #4190
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/identity-credits-migration

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[github-actions]

Thank you for following the naming conventions for pull request titles! 🙏