{
  "python": "3.14.4 (main, Apr  7 2026, 13:13:20) [Clang 21.0.0 (clang-2100.0.123.102)]",
  "sqlite": "3.51.3",
  "platform": "macOS-27.0.1-arm64-arm-64bit-Mach-O",
  "source": "examples/system-design/labs/14/upload.py",
  "sha256": "0cf7e33819a34a78bd64f64833f9dd3a58ec65922747d3a45ea9e0781545989b"
}
$ /opt/homebrew/opt/python@3.14/bin/python3.14 examples/system-design/labs/14/upload.py
{"after_failure_visible": [], "removed": ["orphan"], "after_retry_visible": [["p1"]], "pending_object_preserved": true}
PASS: rollback hides half-finished photo; GC preserves referenced upload; retry publishes

EXIT_CODE=0
$ /opt/homebrew/opt/python@3.14/bin/python3.14 examples/system-design/labs/14/upload.py --unsafe
{"after_failure_visible": [], "removed": ["orphan"], "after_retry_visible": [["p1"]], "pending_object_preserved": true}
EXPECTED_REJECTION: deleting all uploaded-but-not-ready objects destroys resumable session

EXIT_CODE=2