{
  "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/11/retry.py",
  "sha256": "c8b47ceaa1fe08e3e36209ba34ff28ff778a43662109ccb033be35a63d298d23"
}
$ /opt/homebrew/opt/python@3.14/bin/python3.14 examples/system-design/labs/11/retry.py
{"naive": {"calls": 900, "rejected": 0, "max_elapsed_ms": 1020}, "bounded": {"calls": 40, "rejected": 80, "max_elapsed_ms": 220}, "shorter_deadline": {"calls": 20, "rejected": 80, "max_elapsed_ms": 100}}
PASS: call budget, deadline and admission bounds hold in virtual time

EXIT_CODE=0
$ /opt/homebrew/opt/python@3.14/bin/python3.14 examples/system-design/labs/11/retry.py --unsafe
{"naive": {"calls": 900, "rejected": 0, "max_elapsed_ms": 1020}, "bounded": {"calls": 40, "rejected": 80, "max_elapsed_ms": 220}, "shorter_deadline": {"calls": 20, "rejected": 80, "max_elapsed_ms": 100}}
EXPECTED_REJECTION: nested retries exceed downstream budget

EXIT_CODE=2