Skip to main content

ICW Implementation Plan — E6:S07:T115 last-modified stamp forensic integrity guardrails

Plan​

Phase 1 — Contract and policy locking​

  1. Publish normative timestamp semantics (substantive vs non_substantive) in governance docs.
  2. Specify immutable behavior for rewrite-only board operations.
  3. Define source-of-truth evidence hierarchy for timestamp derivation.

Phase 2 — Workflow guardrail implementation design​

  1. Add classification layer in board update paths before stamp mutation.
  2. Gate mutation behind substantive-evidence checks.
  3. Add anomaly detection for mass stamp churn without source deltas.
  4. Add integrity audit counters to UKW/RW output summaries.

Phase 3 — Verification and regression​

  1. Add targeted tests for no-op rewrite stability.
  2. Add tests for legitimate substantive updates.
  3. Add tests for anomaly detection behavior.
  4. Validate canonical + alias board paths behave identically.

Risks and Mitigations​

  • Risk: Overly strict gating suppresses legitimate updates.
    • Mitigation: define explicit positive evidence categories and allow-list transitions.
  • Risk: Existing workflows depend on rewrite-driven timestamps.
    • Mitigation: introduce clear migration note and validator diagnostics before enforcement hardening.
  • Risk: Drift between policy text and script behavior.
    • Mitigation: require validator-backed checks plus regression tests as release gates.

Completion Definition​

Task is implementation-ready complete when policy is explicit, guardrail design is codified, and tests/validators demonstrate rewrite-only operations do not alter row timestamps.

References​