Onboarding: enforce single project per user on onboard

[Ayush8923]

Issue: ProjectTech4DevAI/kaapi-frontend#133

Summary

• After the user is created/looked up, insert the corresponding user_project mapping in the same transaction.
• If the user already has a mapping to a different project, the endpoint now responds with 409 Conflict: User '<email>' is already associated with another project.

Checklist

Before submitting a pull request, please ensure that you mark these task.

• Ran fastapi run --reload app/main.py or docker compose up in the repository root and test.
• If you've fixed a bug or added code that is tested and has test cases.

[coderabbitai]

Warning

Rate limit exceeded

@Ayush8923 has exceeded the limit for the number of commits that can be reviewed per hour. Please wait 15 minutes and 5 seconds before requesting another review.

To keep reviews running without waiting, you can enable usage-based add-on for your organization. This allows additional reviews beyond the hourly cap. Account admins can enable it under billing.

⌛ How to resolve this issue?

After the wait time has elapsed, a review can be triggered using the @coderabbitai review command as a PR comment. Alternatively, push new commits to this PR.

We recommend that you space out your commits to avoid hitting the rate limit.

🚦 How do rate limits work?

CodeRabbit enforces hourly rate limits for each developer per organization.

Our paid plans have higher rate limits than the trial, open-source and free plans. In all cases, we re-allow further reviews after a brief timeout.

Please see our FAQ for further information.

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: dfa465d9-38d9-41d2-bc7d-200b0cdec66d

📥 Commits

Reviewing files that changed from the base of the PR and between ce5346a and 53ff588.

📒 Files selected for processing (2)

• backend/app/crud/onboarding.py
• backend/app/tests/crud/test_onboarding.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch enhancement/onboarding-admin-assignments

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Review rate limit: 0/1 reviews remaining, refill in 15 minutes and 5 seconds.}

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[vprashrex]

why user can't map to other project ?

[Ayush8923]

Because then we would have to build the entire flow where a user can switch between multiple projects using a single login. For example, if a user belongs to multiple projects, we would need to show a dropdown in the UI to let them switch projects, and the data would then load based on the selected project. This would require a lot of changes, so for now we are avoiding this.