WriteToReadOnlyFile was listed in MalformedErrors, so ClassifyOutcome/
MapOutcome routed it to PermanentFail and the store-and-forward sink
dead-lettered every alarm event in the batch. But WriteToReadOnlyFile is
a connection-configuration fault (the write session was opened without
ReadOnly = false), not an event-payload fault — treating it as permanent
silently and permanently discards alarm events on a misconfigured or
regressed connection, which is data loss.
Move WriteToReadOnlyFile from MalformedErrors into ConnectionErrors. The
batch loop now aborts the batch, resets the connection (so the reconnect
path re-opens a writable ReadOnly = false session), and defers the
events as RetryPlease for the next drain tick.
Updated the ClassifyOutcome theory data and added a dedicated regression
test pinning WriteToReadOnlyFile -> RetryPlease.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
SdkAlarmHistorianWriteBackend.WriteBatchAsync replaces the RetryPlease
placeholder with the real entry point — HistorianAccess.AddStreamedValue
(HistorianEvent, out HistorianAccessError) in aahClientManaged, pinned by
decompiling the installed SDK.
The write path opens its own ReadOnly=false connection: the query-side
HistorianDataSource opens ReadOnly sessions and AddStreamedValue fails on
those with WriteToReadOnlyFile. IHistorianConnectionFactory gains a readOnly
parameter (default true, query path unchanged); BuildConnectionArgs is
extracted as a pure helper. HistorianClusterEndpointPicker is shared for
node failover; connection-class errors abort the batch as RetryPlease and
reset the connection, malformed-input codes map to PermanentFail.
Tests: connection-unavailable batch deferral, ClassifyOutcome error-code
table, BuildConnectionArgs read-vs-write shaping (80 pass, 2 rig-skipped).
Live_* round-trip tests stay Skip-gated for the D.1 rollout smoke.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Group all 69 projects into category subfolders under src/ and tests/ so the
Rider Solution Explorer mirrors the module structure. Folders: Core, Server,
Drivers (with a nested Driver CLIs subfolder), Client, Tooling.
- Move every project folder on disk with git mv (history preserved as renames).
- Recompute relative paths in 57 .csproj files: cross-category ProjectReferences,
the lib/ HintPath+None refs in Driver.Historian.Wonderware, and the external
mxaccessgw refs in Driver.Galaxy and its test project.
- Rebuild ZB.MOM.WW.OtOpcUa.slnx with nested solution folders.
- Re-prefix project paths in functional scripts (e2e, compliance, smoke SQL,
integration, install).
Build green (0 errors); unit tests pass. Docs left for a separate pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
