# Review: AD-579b Temporal Validity Windows (Re-review #2)

**Prompt:** prompts/ad-579b-temporal-validity-windows.md
**Reviewer:** Architect
**Date:** 2026-04-27 (third pass)
**Verdict:** ✅ Approved
**Previous Verdict:** ✅ Approved

## Status
Stable. Backward-compatible `0.0` defaults on Episode and AnchorFrame. Clean `_episode_validity_check` helper covering all four cases. ChromaDB metadata round-trip explicit. `recall_valid_at()` is a thin convenience wrapper over `recall_weighted()`.

## Required
None.

## Recommended
None.

## Nits
None.

## Recommendation
Ship it.
