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Design Decision Register (Global) — Updates for Module 07

  • DDR-07-001 (2025-09-11) — Deterministic assignment via hash(subject_key, experiment_salt) for sticky sessions without PII.
  • DDR-07-002 (2025-09-11) — Frequentist significance engine (z-test) for MVP; bayesian optional later.
  • DDR-07-003 (2025-09-11) — Metrics ingestion as append-only events; aggregation jobs compute results.
  • DDR-07-004 (2025-09-11) — Auto-winner requires both p-value < threshold and min_samples satisfied.