diff --git a/dev-docs/BACKLOG.md b/dev-docs/BACKLOG.md
index 183444b0..c2b1811c 100644
--- a/dev-docs/BACKLOG.md
+++ b/dev-docs/BACKLOG.md
@@ -2543,6 +2543,9 @@ contract test) but no automated gate prevents drift over time.
   via `make test-db-create` then `migrate:fresh + seed` from
   globalSetup. No state shared across runs (unlike local
   development).
+- Multi-browser-context e2e patterns for optimistic locking flows
+  with UI rollback validation in the second context (cut #4 from
+  TEST-INFRA-001 sprint)
 
 **Trigger:** No explicit deadline. Surfaces when first review cycle
 feels drift without automated tests, OR when first regression slips