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docs(r2-06): note WriteLiveValues Quality is a documented-dead input (0.2.0 C-002); keep 192 populated (06/C-7)

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Joseph Doherty
2026-07-13 10:04:29 -04:00
parent e5cf986a10
commit 4640ecb19b
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docs/Historian.md
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@@ -102,6 +102,12 @@ write path) and the `ContinuousHistorization` section (driver-value capture). Al
**same** gateway — but only `ServerHistorian` carries the connection (endpoint/key/TLS); the other two
source it from there.
> **Continuous-historization value quality is server-stamped.** The gateway's `WriteLiveValues` SQL path
> **discards** the quality the recorder sends (a server-managed column; 0.2.0 Contracts C-002), so persisted
> quality is stamped gateway-side regardless of what the `ContinuousHistorizationRecorder` provides (it
> hardcodes OPC-DA Good, `192`). Capturing real per-node quality will not persist until the gateway honors
> the field — see `GatewayHistorianValueWriter`'s remarks (archreview 06/C-7).
---
## Tag auto-provisioning (EnsureTags)