Fix file upload race condition - generate UUID before DB commit (INC4…#1058
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…880613, INC4878762) Fixes IntegrityError caused by empty name field in database. Students can now upload files successfully.
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- Add filename sanitization to prevent path traversal attacks - Add path validation to ensure files stay within upload directory
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Fixed IntegrityError caused by empty name field in database. Students can now upload files successfully.
Resolved the file upload race condition (INC4880613, INC4878762)
Generate UUID and filename BEFORE creating database record to avoid race condition that caused IntegrityError with empty name field.