Various simplifications on the FAB proxy

[elisescu]

No description provided.

[sentry]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: fab_credits/views.py

Function	Unhandled Issue
openai_v1_chat_completions	JSONDecodeError: Expecting value: line 1 column 79 (char 78) /proxy/openai/v1/chat/... Event Count: 2

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