diff --git a/.claude/skills/sister-project-history/otopcua.md b/.claude/skills/sister-project-history/otopcua.md
index 24a8a76..655e8a2 100644
--- a/.claude/skills/sister-project-history/otopcua.md
+++ b/.claude/skills/sister-project-history/otopcua.md
@@ -292,3 +292,7 @@ AddRoute of the dev Mac (`oee-tagdump-mac`, `10.181.206.245.1.1`) on the two tes
   - **#684:** ⚠️ Average/Min/Max/Range/*ActualTime use Good samples only (Part 13); Uncertain values beyond the Good
     extreme make Min/Max `Uncertain_DataSubNormal`.
   - **ScadaBridge impact:** none — no processed history reads.
+- **2026-10-12 live AVEVA gate (VPN).** #675/#677/#679/#681 verified against the real historian and closed. Found
+  historiangw#27 (aggregate interval sent 10,000× too large ⇒ Gateway native TimeAverage/Total wrong end to end) and
+  OtOpcUa #685–#688 (Gateway native-row handling, reverse/end-only raw reads failing since #669, synthetic boundary row
+  in raw reads, default cap vs gateway ceiling). AVEVA TWA is sloped like the SQL backends but excludes NULL-gap time.