New SDK surface:
HistorianClient.EnsureTagAsync(HistorianTagDefinition)
HistorianClient.DeleteTagAsync(string tagName)
Plumbing:
src/AVEVA.Historian.Client/Models/HistorianTagDefinition.cs
Public input model — TagName/Description/EngineeringUnit/DataType/MinEU/MaxEU.
Currently only HistorianDataType.Float is live-verified.
src/AVEVA.Historian.Client/Wcf/HistorianTagWriteProtocol.cs
SerializeAnalogCTagMetadata produces 146-byte payload byte-for-byte
identical to the captured native EnsT2(Float) request.
SerializeDeleteTagNames produces ushort 0x6751 + ushort 1 + uint count
+ per-tag (uint charCount + UTF-16 chars).
src/AVEVA.Historian.Client/Wcf/HistorianWcfTagWriteOrchestrator.cs
Both EnsT2 and DelT run the full Stat-priming chain captured for the
analog flow (UpdC3 + Stat.GetV ×3 + Stat.GETHI ×2 + 7× GetSystemParameter
+ Trx.GetV + Retr.GetV).
src/AVEVA.Historian.Client/Wcf/HistorianWcfTagClient.cs
MapDataType extended to accept tag-origin marker 0xC7 (SDK-created tags).
Tests:
5 golden-byte tests (HistorianTagWriteProtocolTests):
SerializeAnalogCTagMetadata byte-for-byte match against captured 146-byte fixture
SerializeAnalogCTagMetadata produces different bytes for different inputs
SerializeDeleteTagNames single-tag matches captured shape
SerializeDeleteTagNames multi-tag appends each
SerializeDeleteTagNames empty list throws
1 live integration test (gated by HISTORIAN_WRITE_SANDBOX_TAG):
EnsureTagAsync_AndDeleteTagAsync_RoundTrip_AgainstLocalHistorian
EnsureTagAsync creates the sandbox tag, GetTagMetadataAsync reads it
back. 130/130 tests pass.
Harness improvements:
--write-delete-after now runs DelT independently of AddStreamedValue
outcome.
HistorianTagStatusList constructed correctly for DeleteTags reflection
call (previous StringCollection attempt failed with TypeMismatch).
Known DelT gap: SDK's DeleteTagAsync returns true but server-side
cascading deletion does not always complete (the row remains in
Runtime.dbo.Tag). The captured native flow's DelT removes the tag
cleanly (verified via harness --write-delete-after), so something
around the WCF DelT call is missing from our orchestrator. Documented
as known issue with SMC-based cleanup as workaround.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
dohertj2
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