feat(localdb): chunked deployment-artifact cache over ILocalDb

128 KiB raw chunks base64-encoded into deployment_artifacts, with a per-cluster
pointer carrying a SHA-256 over the raw bytes. Reassembly verifies chunk count
AND the SHA before returning, so a partially replicated artifact reads back as a
clean miss rather than a silently truncated address space.

Adds GetCurrentUnkeyedAsync beyond the plan's interface: at the boot-failure seam
the actor cannot know its ClusterId (it is derivable only from an artifact you
already have, or from the central DB that is unreachable). Recon D-1.

The prune's 'deployment_id <> @DeploymentId' clause makes 'the pointer's target is
always present' structural rather than a side effect of clock resolution. Three
stores inside one timestamp tick fall through to a deployment_id tiebreak, and
since real ids are GUIDs that ordering is random - the row just written could lose,
leaving the pointer naming chunks that no longer exist. Verified red without the
clause.

This commit is contained in:

Joseph Doherty

2026-07-20 10:58:27 -04:00

parent 2bae1b4c9f

commit a38a52b831

3 changed files with 53 additions and 8 deletions

									
										src/Server/ZB.MOM.WW.OtOpcUa.Runtime/Deployment/IDeploymentArtifactCache.cs
									
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				namespace ZB.MOM.WW.OtOpcUa.Runtime.Deployment;

				namespace ZB.MOM.WW.OtOpcUa.Runtime.DeploymentCache;

				/// <summary>

				///     Node-local durable cache of the deployment artifact this node last applied.