diff --git a/.claude/skills/sister-project-history/otopcua.md b/.claude/skills/sister-project-history/otopcua.md
index a0a18c7..c7333fb 100644
--- a/.claude/skills/sister-project-history/otopcua.md
+++ b/.claude/skills/sister-project-history/otopcua.md
@@ -158,3 +158,8 @@ AddRoute of the dev Mac (`oee-tagdump-mac`, `10.181.206.245.1.1`) on the two tes
   called `ReinitializeAsync` but kept the actor's data + alarm handles, which the reinit had invalidated, so the driver
   would go silent. Now releases both at the driver, reinitialises, and re-subscribes both. **Latent only** — unreachable
   from a deploy since #516 (a DriverConfig change respawns). **ScadaBridge impact: none.**
+- **2026-10-09 #664 (closed; OtOpcUa `f622d0be`).** Mid-connect `ApplyDelta` re-runs `InitializeAsync(newConfig)`, which
+  Calculation and Galaxy ignored (old tag set / old gateway endpoint while the deploy reported success). Calculation now
+  adopts a config with a body; Galaxy (no hot-swap) refuses a non-equivalent one with `NotSupportedException`, as its
+  `ReinitializeAsync` already did; the actor sends `DeltaApplied` after the adopted init. Latent (unreachable since #516).
+  **ScadaBridge impact: none.**