Joseph Doherty
cfd403710e
Every HistoryUpdate a SQL backend applies now leaves a modification trail
(prior value, principal, Part 11 update type, modification time), and
HistoryReadRaw with IsReadModified=true serves it as HistoryModifiedData.
- Core: HistoryUpdateContext threaded into all three IHistorianDataUpdater
methods; IHistorianDataSource.ReadModifiedAsync (default NotSupported =>
BadHistoryOperationUnsupported on Gateway/Null); HistoryModified* contracts.
- SqlServer: schema v2 (002_sample_modified.sql, RequiredVersion=2, docs copy);
trail written by OUTPUT ... INTO on the same MERGE/DELETE statement, so a
failed update leaves no audit row; retention purges SampleModified per tag on
the source-time cutoff; ReadModifiedAsync keyed on (SourceTimeUtc, ModifiedId).
- QuestDB: append-only {prefix}sample_modified (TTL like samples), trail row
written BEFORE the change (orphan-on-crash, never an untracked change);
existence reads now carry the prior value; ReadModifiedAsync.
- Node manager: modified reads dispatch + page via the #669 continuation store
(HistoryContinuationState gains HistoryCursorKind + LastModifiedId), gated by
the existing HistoryRead decision; session principal / key id passed to the
updater. IsDeleteModified stays unsupported.
- Client.CLI: historyread --modified.
- Tests: node-manager dispatch/paging/cursor binding/principal threading,
over-the-wire HistoryModifiedData, shared ModifiedValueConformance on both
backends, SqlServer atomicity (forced trail failure => no change) + v1->v2
upgrade + retention trail purge.
- Docs: Historian.md (Modified-value history section, schema v2 upgrade note),
security.md, Client.CLI.md, CLAUDE.md.
18 lines
859 B
C#
18 lines
859 B
C#
using Opc.Ua;
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namespace ZB.MOM.WW.OtOpcUa.Client.Shared.Models;
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/// <summary>
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/// One entry of an OPC UA Part 11 modified-value history read (HistoryReadRaw with <c>IsReadModified = true</c>): the
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/// value as it was BEFORE the modification plus the server's <see cref="ModificationInfo"/>.
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/// </summary>
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/// <param name="Value">The prior value at its source timestamp (an insert had none: null value, Bad status).</param>
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/// <param name="ModificationTime">When the modification was applied.</param>
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/// <param name="UpdateType">The Part 11 update type (Insert / Replace / Update / Delete).</param>
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/// <param name="UserName">Who made the modification (the server's recorded principal).</param>
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public sealed record HistoryModifiedEntry(
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DataValue Value,
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DateTime ModificationTime,
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HistoryUpdateType UpdateType,
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string? UserName);
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