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[Fix] New user route user_id conflict handling

Relevant issues

This PR implements handling for user_id collision in the /user/new route. Previously only email was checked for collisions, but the system relies on user_id for various other operations. Also changes the collision HTTP Code from 400 (Bad Request) to 409 (Conflict)

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  • I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
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Type

🐛 Bug Fix
✅ Test

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vercel bot commented Dec 5, 2025

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litellm Ready Ready Preview Comment Dec 7, 2025 6:29am

@yuneng-jiang
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Thanks to @richardmcsong for bringing this to our attention.

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2 participants