[OpsAI] fix: return 404 instead of raising KeyError in user_profile()

[mw-middleware-labs-sandbox]

Problem

The user_profile() function raised an unhandled KeyError when an unknown username was requested, resulting in HTTP 500 responses and full stack trace heap retention per failed request — contributing to memory pressure and repeated OOMKills on the python-demo pod.

Fix

• Replaced bare dict access with .get()
• Returns a JSON 404 response for unknown users instead of raising an exception
• Eliminates unhandled exception propagation through the Flask stack

Risk

Low — only the error path for non-existent users is affected. Happy path for existing users is unchanged.

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This PR was automatically generated by OpsAI in response to an OOMKilled alert (rule_id: 1231002) on pod python-demo-6dbfd45d74-5hr7l.

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OpsAI Context

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Created By

Name: Sanjay
Email: sanjay+sandbox@middleware.io