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- The post query router routes no clause of a group whose last drift-check recorded miss / diff / extra; all or nothing, so such a query stays fully native. A group never checked keeps routing (decision 2026-09-27: no slowdown after upgrading; PR-073 samples daily). - The check sits in route_clause(), which every routed clause, HivePress sort shape and meta_key sort goes through. - Verify: PostQueryRouterDriftTest (drifting group and drifting sort key RED before); dev36 hp_listing price search in shadow_read: clean → flat, drift → native, unchecked → flat, found 90347 each. - PR: PR-072