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fix(historian): #679 Gateway — Average/Count not supported (no AVEVA equivalent), TimeAverage → TimeWeightedAverage

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Joseph Doherty
2026-10-11 15:19:19 -04:00
parent 6d5c1c768b
commit fb5ec80fe6
7 changed files with 56 additions and 22 deletions
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CLAUDE.md
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@@ -1363,7 +1363,7 @@ historian tagname, which is the tag's driver `FullName`.
The server dispatches all OPC UA HistoryRead to the registered `IHistorianDataSource` — the
`GatewayHistorianDataSource` read client when enabled, else the `NullHistorianDataSource` default
(historized nodes return `GoodNoData`, never an error). Supported variants: Raw, Processed
(Average/Minimum/Maximum/Total/Count aggregates), and AtTime over historized variable nodes; Events over
(backend-dependent: Gateway serves TimeAverage/Minimum/Maximum/Total, with Average/Count `BadAggregateNotSupported` since AVEVA has no mean or sample count, #679; SqlServer/QuestDb serve seventeen), and AtTime over historized variable nodes; Events over
alarm-owning equipment-folder event-notifier nodes. Reads are ungated (served from any redundancy node);
authorization uses the standard `AccessLevels.HistoryRead` bit set at materialization.