diff --git a/docs/reverse-engineering/handoff.md b/docs/reverse-engineering/handoff.md
index 4811321..108ec4b 100644
--- a/docs/reverse-engineering/handoff.md
+++ b/docs/reverse-engineering/handoff.md
@@ -87,6 +87,12 @@ reuses the proven 2020 WCF byte serializers/parsers unchanged inside protobuf
    server (markers `SdkSendProbe`/`SdkCaptureProbe` confirmed in returned rows). Golden-tested
    (`GrpcEventSendProtocolTests`) + gated live test (`SendEventAsync_OverGrpc_AcceptsEvent`,
    opt-in `HISTORIAN_GRPC_EVENT_SEND=1`).
+   **PERSISTENCE RESOLVED:** the earlier WCF/M2 caveat was "server accepts AddS2 but the local
+   dev box does NOT persist the event to `v_AlarmEventHistory2`" — we couldn't tell if that was an
+   SDK gap or the environment. The gRPC read-back against the live 2023 R2 server **proves the event
+   persists** (sent via the pure-managed SDK, then independently read back from the server's event
+   history). So non-persistence on the local box was purely the dev-box event-ingestion environment,
+   **not an SDK gap** — the event-send path (WCF and gRPC, same "OS" buffer) is durably correct.
 4. **ExecuteSqlCommand over gRPC** — **server-walled** (`CSrvDbConnection`;
    RegisterTags prime doesn't help). Use WCF for SQL.
 5. **R4.2 revision EDITS** — storage-engine-pipe-only on BOTH transports (the D2 wall).
@@ -108,9 +114,9 @@ reuses the proven 2020 WCF byte serializers/parsers unchanged inside protobuf
 
 To move any remaining item you need a **server-side / connection-level angle**
 (item 1 — v8 event auth is solved; row retrieval is connection-gated, see the
-NEXT SESSION section of `grpc-event-query-capture.md`), a **fresh native capture**
-(SendEvent gRPC framing — item 3), a **different server** (SF-active for item 2),
-or a **demand signal** to unlock a deferred item.
+NEXT SESSION section of `grpc-event-query-capture.md`), a **different server**
+(SF-active for item 2), or a **demand signal** to unlock a deferred item.
+(SendEvent over gRPC — formerly item 3 — is now SHIPPED + live-validated.)
 Live-server gRPC probe recipe: set
 `HISTORIAN_GRPC_HOST`/`_PORT 32565`/`_TLS true`/`_DNSID` + domain creds (strip
 quotes — `reference_wonder_sql_vd03_credentials`) and run the gated