ScadaBridge/docs/known-issues/2026-06-24-template-inheritance-ui-and-cli-followups.md

Follow-up tracker — template-inheritance UI gaps + CLI/validation footguns (2026-06-24 session)

Status: PARTIALLY RESOLVED · Found: 2026-06-24 · Context: live ops session on wonder-app-vd03 (CvdReactor / Z28061 / Z28061Sim) — renaming the template, adding the LeakTest module, and adding MoveInType to the MESReceiver children. Components: Central UI (#9), Template Engine (#1), CLI (#19), Configuration Database (#17)

Resolved: #3 (collision detector) and #7 (sandbox compile surface) on branch fix/followups-3-7; #1 + #2 (inherited-member propagation & resync) on branch fix/followups-1-2 (2026-06-24). Open: #4, #5, #6, #8.

Issues are listed worst-first. Severities are author estimates. None caused data loss; the runtime/flattened config and deployed instances are correct.

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1. Template editor omits inherited-but-unmaterialized base attributes (user-reported)

Severity: Medium · Components: Central UI (#9), Template Engine (#1) · ✅ RESOLVED 2026-06-24 (branch fix/followups-1-2)

Fix: shared root cause with #2 — see #2's fix. Once a template's inherited rows are materialized (auto-propagation going forward, or the Resync action for already-stale templates), the editor's editable Attributes/Alarms/Scripts tabs list them. The "base changed" banner is now actionable: it carries a Resync inherited members button (TemplateEdit.razor) that calls TemplateService.ResyncInheritedMembersAsync and reloads. The read-only "Effective inherited set" preview is retained.

Symptom: On /design/templates → LeftMESReceiver, the Attributes tab does not list MoveInType. Same for RightMESReceiver. (Also missing from the list: all MoveOut* and ScanStateCmd.)

Root cause: MoveInType (String), the 12 MoveOut*, and ScanStateCmd live on the base MESReceiver template (id 3, 26 attrs). The derived children LeftMESReceiver/RightMESReceiver (ids 5/6) only have 12 materialized IsInherited rows (the MoveIn* basics) — the base attributes added after these children were derived were never materialized as child rows. The editor's main Attributes tab lists only the template's stored rows (TemplateEdit.razor:187 → GetAttributesByTemplateIdAsync(Id); count badge at :415), so the unmaterialized inherited members are invisible there.

Not a runtime bug: the flattener resolves the full chain, so LeftMESReceiver.MoveInType is in the flattened deploy config and is bound + live on the instances ('' / 'na', Good). The page also has an "Effective inherited set" read-only preview (M9-T26b, TemplateEdit.razor:465-491) + a staleness banner (:292-301) that do surface these — but the main, editable Attributes list does not.

Suggested fix: in the Attributes tab, render the resolved inherited set (with inherited badges) rather than only materialized rows — or auto-materialize missing inherited rows on load. See #2 (shared root cause).

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2. Derived templates carry incomplete/stale IsInherited row sets

Severity: Medium · Components: Template Engine (#1), Configuration Database (#17) · ✅ RESOLVED 2026-06-24 (branch fix/followups-1-2)

Fix: root-cause fix — derived templates' stored inherited rows are now kept in sync two ways. (1) Auto-propagation: adding/updating/removing a member on a template now reconciles its entire derived subtree (TemplateService.ReconcileDescendantsAsync, called from every member-mutating path incl. native-alarm-source CRUD in the ManagementActor). (2) Resync: ResyncInheritedMembersAsync (CLI template resync-members, management ResyncInheritedMembersCommand, Designer-gated, audited; UI banner button) repairs a template + its subtree on demand — materializing missing placeholders, re-syncing drifted ones, removing orphans, across attributes/alarms/scripts/native sources. BuildDerivedTemplate also now materializes native-source placeholders at compose time (previously omitted, which made any inherited native source perpetually stale). Authored overrides are never touched. Covered by TemplateServiceTests (materialize / drift-update / orphan-remove / override-untouched / base-cascade / multi-type / propagation / end-to-end add). Documented in Component-TemplateEngine.md → "Inherited-Member Propagation & Resync".

Symptom: LeftMESReceiver/RightMESReceiver (parent=3) have 12 stored attribute rows vs the base's 26. By contrast LeftReactorSide/RightReactorSide (parent=7) mirror the full 61. So derived row-sets are inconsistent.

Root cause: when a base attribute is added after a child is derived, the child's stored IsInherited placeholder rows are not auto-resynced. There is a staleness banner but no surfaced one-click "resync inherited members" action (or it exists and was never run for these children). This is the data root cause of #1.

Suggested fix: a "resync inherited members" command (CLI + UI) that materializes missing base members onto derived children; consider running it automatically when a base attribute is added.

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3. Collision detector blocks adding attributes/compositions to ANY derived template

Severity: Medium-High · Components: Template Engine (#1) · ✅ RESOLVED 2026-06-24 (branch fix/followups-3-7)

Fix: CollectDirectMembers now takes a skipInherited flag and skips IsInherited placeholder rows for the direct-template and inherited-parent walks (where the inheritance walk already re-adds those members under the parent's origin), while keeping them for the composed-module walk (the sole representation of a derived module's inherited members). Covered by CollisionDetectorTests (DerivedTemplateWithInheritedPlaceholders_NoFalseCollision, MultiLevelInheritedPlaceholders_NoFalseCollision, DerivedTemplate_GenuineCollisionStillDetected_DespiteInheritedPlaceholder) and the end-to-end TemplateServiceTests.AddAttribute_ToDerivedTemplateWithInheritedPlaceholders_Succeeds. Documented in Component-TemplateEngine.md → Naming Collision Detection.

Symptom: template attribute add --template-id 5 --name MoveInType ... fails with 13 "Naming collision" errors — the new attribute plus all 12 pre-existing inherited rows. Same class of failure when adding a composition to a derived template (hit earlier when trying to add LeakTest to LeftReactorSide).

Root cause: CollisionDetector.CollectDirectMembers (CollisionDetector.cs) emits every template.Attributes row — including IsInherited placeholders — with origin = child name, while CollectInheritedMembers emits the same names with origin = parent '…'. Two distinct origins for the same canonical name ⇒ reported as a collision. AddAttributeAsync (TemplateService.cs:294) and AddCompositionAsync (:869) both run DetectCollisions, so there is effectively no supported API path to extend a derived template — and the error message is misleading (it blames pre-existing inherited attrs, not the member you're adding).

Workaround used this session: add the feature module to the base template instead (LeakTest → base ReactorSide (7)); the flattener propagates it to all derivations.

Suggested fix: CollectDirectMembers should skip IsInherited rows (or the grouping should treat an inherited row and its parent source as the same origin), so only genuine cross-origin duplicates are flagged.

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4. CLI instance set-bindings cannot set DataSourceReferenceOverride

Severity: Medium · Components: CLI (#19)

Symptom: instance set-bindings --bindings only accepts [attributeName, dataConnectionId] pairs (InstanceCommands.cs → ConnectionBinding(name, connId) 2-arg). The override is sent as null, and because SetConnectionBindingsAsync upserts DataSourceReferenceOverride = b.DataSourceReferenceOverride (InstanceService.cs:340), using the CLI on an attribute that already has an override would wipe it.

Workaround used this session: raw POST /management with {"command":"SetConnectionBindings","payload":{...,"dataSourceReferenceOverride":"…"}} — the wire contract ConnectionBinding(AttributeName, DataConnectionId, DataSourceReferenceOverride?) does carry the field; only the CLI omits it.

Suggested fix: add an optional 3rd element / --ref-override to the CLI bindings input.

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5. CLI template update is full-replace, not partial

Severity: Low · Components: CLI (#19), Template Engine (#1)

Symptom: omitting --description on template update overwrites the stored description to NULL (TemplateService.cs:124-125 assigns Name+Description unconditionally). Renaming a template silently drops its description unless you re-pass it.

Suggested fix: treat omitted optional fields as "leave unchanged" (nullable-not-provided vs explicit-null), or warn when a non-empty description would be cleared.

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6. (Minor) CLI template list/get table output dumps every attribute

Severity: Low · Components: CLI (#19)

Symptom: --format table template list emitted ~171 KB (the full attribute set per template inline), unusable in a terminal. --format json is fine.

Suggested fix: a compact table projection (id/name/desc/#attrs/#comps) for list/get; reserve full attribute dumps for an explicit --verbose/--detail flag.

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7. Central UI script editor false-flags batch/wait helpers (sandbox compile surface out of sync)

Severity: Medium · Components: Central UI (#9), Script Analysis (#25) · ✅ RESOLVED 2026-06-24 (branch fix/followups-3-7)

Fix: SandboxAttributeAccessor now mirrors the runtime AttributeAccessor — added WriteBatchAndWaitAsync, both WaitAsync overloads, and both WaitForAsync overloads with matching signatures. They throw a clearly-labelled ScriptSandboxException if exercised in Test Run (the central sandbox has no device-batch/event-waiter transport), but they now resolve at compile time so the editor stops false-flagging valid scripts. A reflection parity test isn't feasible across the CentralUI→SiteRuntime boundary (Central UI does not reference Site Runtime by design), so the guard is representative-script "diagnose clean" tests in ScriptAnalysisServiceTests (InstanceScript_BatchAndWaitHelpers_DiagnoseClean, ChildInstanceScript_WriteBatchAndWait_DiagnoseClean), consistent with how the inbound Database/WaitForAttribute and Notify surfaces are guarded. Documented in Component-ScriptAnalysis.md → Parity guard.

Symptom: In the template script editor (/design/templates/{id} → Scripts → Edit → Code), a script that calls Attributes.WriteBatchAndWaitAsync(...) (or on a child, Children["X"].Attributes.WriteBatchAndWaitAsync(...)) shows a red compile error: 'SandboxAttributeAccessor' does not contain a definition for 'WriteBatchAndWaitAsync' ... (CS1061). Confirmed on CvdReactor.MesMoveIn; the same false error hits the base MESReceiver.MoveIn/MoveOut, which also use the helper.

Root cause: the editor validates against the Central UI's own sandbox surface (CentralUI/ScriptAnalysis/SandboxScriptHost.cs). Its SandboxAttributeAccessor only defines this[string], GetAsync, SetAsync, Resolve — it is missing WriteBatchAndWaitAsync, WaitAsync, and WaitForAsync (none are defined anywhere in the CentralUI sandbox surface). The real runtime AttributeAccessor (SiteRuntime/Scripts/ScopeAccessors.cs) and the deploy-gate ScriptCompileSurface (ScriptAnalysis) both define them — so template validate reports the script clean and it deploys/runs fine. The error is purely the in-editor validator.

Impact: misleads authors and can block saving from the UI for any script using the batch-write/wait helpers, even though the script is valid. Authoring such scripts currently has to go through the management API (as was done for MesMoveIn).

Suggested fix: bring SandboxAttributeAccessor (and the sandbox composition/children accessors) to parity with the runtime AttributeAccessor — add WriteBatchAndWaitAsync / WaitAsync / WaitForAsync with matching signatures. Ideally enforce surface parity with a test, like the RoslynScriptCompiler "representative real script" corpus already does for ScriptCompileSurface. Three surfaces (runtime, deploy-gate ScriptCompileSurface, UI SandboxScriptHost) currently drift independently — consider collapsing to one source of truth.

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8. Deploy-time unbound-binding validation returns one giant semicolon-joined error string

Severity: Low · Components: Template Engine (#1), Deployment Manager (#2)

Symptom: Deploying an instance whose data-sourced attributes aren't all bound fails with a single error that concatenates one clause per attribute: Pre-deployment validation failed: Attribute 'LeftReactorSide.LeakTest.DeltaVac' has a data source reference but no connection binding; Attribute 'LeftReactorSide.LeakTest.ResultType' has …; …. For 50–194 unbound attrs (e.g. Z28062's unbound LeakTest members) it's a wall of text that's hard to scan in a CLI/UI toast.

Root cause: ValidateConnectionBindingCompleteness emits one clause per unbound attribute and joins them into a flat string; there is no grouping or count.

Suggested fix: return a structured/summarized error — leading count (52 attributes are unbound) + grouped-by-module breakdown (or a capped list with "…and N more") — instead of the flat semicolon-joined dump. Keep the full list available in a detail/expandable view or the deploy log.