str(uuid_obj) produces dashed 36-char format; SQLite stores UUID as 32-char
hex without dashes, so WHERE user_id = :uid never matched. Using .hex fixes
confirm_upload (api/documents.py) and delete_document (services/storage.py).
Removes stale xfail from test_delete_decrements_quota — now passes on SQLite.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
test_quota_increment_atomic and test_quota_exceeded_response were marked
xfail for PostgreSQL but pass on SQLite — markers removed, tests now PASSED.
Concurrent race and delete decrement keep xfail; they require real PG locking.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>