docs(plans): flow debugger design — trace steps are audit events; mgmt-command execution path; context-emitted write/wait rows

Claude-Session: https://claude.ai/code/session_01GSLkkHKz9JrAtmJjmQK3cP

docs/plans/2026-09-05-flow-debugger-design.md

@@ -92,10 +92,15 @@ A new `AuditChannel.ScriptTrace` with kinds:
 | Kind | Emitted by | Payload (`DetailsJson`) |
 |------|-----------|-------------------------|
 | `RouteCall` | Central `RouteHelper.Call` (**always-on**, not gated) | target instance, script, args (redacted per existing policy), return value, success/error, duration ms, `ChildExecutionId` |
-| `ScriptRun` | Site `ScriptRunLauncher` on run completion (gated) | script, instance, trigger kind, parameters, return value, success/error, duration ms, console output (capped 8 KB like other payloads), source node |
+| `ScriptRun` | Site `ScriptRunLauncher` on run completion (gated) | script, instance, trigger `{kind, attribute, value, source}` (a value-change run's trigger rides here — there is no separate `TriggerFired` kind), parameters, return value, success/error, duration ms, source node |
-| `AttributeWrite` | Site `InstanceActor` write handlers (gated) | one row per batch: attributes[{name, before, written, quality, ack ms}], trigger attribute, static/data-sourced |
+| `AttributeWrite` | Site `ScriptRuntimeContext.SetAttribute` / `WriteBatchAndWait` (gated) | one row per write or batch: writes[{attribute, written, success, error}], trigger attribute |
-| `AttributeWait` | Site `InstanceActor.HandleWaitForAttribute` (gated) | attribute, predicate/target, timeout, outcome (satisfied/timeout/cancelled), elapsed ms, observed value |
+| `AttributeWait` | Site `ScriptRuntimeContext.WaitInternal` (gated) | attribute, predicate/target, timeout, outcome (satisfied/timeout/cancelled/error), elapsed ms, observed value |
-| `TriggerFired` | Site `ScriptActor` when a value-change run is spawned with a stamped `SourceExecutionId` (gated) | attribute, old/new value, source (static write / device echo) |
+
+**Who emits `AttributeWrite`/`AttributeWait` (planning correction 2026-09-05):** every accessor path
+funnels into three `ScriptRuntimeContext` methods — `SetAttribute`, `WriteBatchAndWait` and
+`WaitInternal` — and the context already holds `IAuditWriter`, `_executionId` and
+`_parentExecutionId`, so the `InstanceActor` needs no new ids and no new request fields. Batch-write
+echoes are **not** armed in v1 — only `SetStaticAttributeCommand` writes arm (§5.3).
 
 Every row carries the run's `ExecutionId` and `ParentExecutionId` exactly as the existing channels
 do, so the Execution Chain walk, `IX_AuditLog_ParentExecution`, telemetry forwarding, reconciliation
@@ -132,14 +137,17 @@ The debugger writes the chosen attribute through the instance actor's normal pat
 - **Static attribute:** `RouteToSetAttributes` → `SetStaticAttributeCommand` with
   `SourceExecutionId = <debugger root id>`, `Trace = true`. The existing cascade already stamps
   the resulting `AttributeValueChanged` and the spawned run's `ParentExecutionId`. Nothing new.
-- **Data-sourced attribute:** a single-attribute `WriteAttributeBatchRequest` (new additive
+- **Data-sourced attribute:** the **same** `RouteToSetAttributes` → `SetStaticAttributeCommand`
-  `SourceExecutionId` + `Trace`) → DCL `WriteTagBatchRequest`. The device echo comes back through
+  path — `InstanceActor` already dispatches data-sourced attributes to the DCL
-  the DCL as an ordinary `AttributeValueChanged` with no source. **Trace arm:** when
+  (`HandleSetDataAttribute` → `WriteTagRequest`); no `WriteAttributeBatchRequest` change is needed.
-  `InstanceActor` performs a traced write it records `(attribute → sourceExecutionId, expiresAt =
+  The device echo comes back through the DCL as an ordinary `AttributeValueChanged` with no
+  source. **Trace arm:** when `HandleSetDataAttribute` sees `command.Trace &&
+  command.SourceExecutionId != null` it records `(attribute → sourceExecutionId, expiresAt =
   now + TraceArmWindow)` (default 30 s, `SiteRuntimeOptions`, one entry per attribute, newest
   wins). The next DCL value change for that attribute — whatever the value, so a device that
   clamps or rejects the write still shows what it actually did — is published with
-  `SourceExecutionId` and `Trace` set, and the arm is consumed. An arm that expires unconsumed
+  `SourceExecutionId` and `Trace` set (consumed in `HandleTagValueUpdate`), and the arm is
+  consumed. An arm that expires unconsumed
   emits nothing; the debugger renders the trigger node as `no echo within 30 s`.
 
 The arm exists only for traced writes, so production behaviour is unchanged. Alarm cascades that
@@ -147,38 +155,44 @@ the echo also fires inherit the parent id exactly as static cascades do today.
 
 ### 5.4 Live-run inline transport
 
-`RouteToCallResponse` gains additive `ChildExecutionId` (`Guid?`) and `Steps`
+**A trace step IS an `AuditEvent` in channel `ScriptTrace`** — there is no separate wire record.
-(`IReadOnlyList<FlowStep>?`, the same records that became the site's audit rows, in emission
+`RouteToCallResponse` gains additive `ChildExecutionId` (`Guid?`) and `TraceEvents`
-order). The site collects steps in a per-run `FlowTraceCollector` held by `ScriptRuntimeContext`
+(`IReadOnlyList<AuditEvent>?`, the very events that became the site's audit rows, in emission
-and attaches the list to the `ScriptCallResult` → `RouteToCallResponse` when `Trace` is set.
+order); on the wire it is `repeated AuditEventDto trace_events` (the DTO `sitestream.proto`
-Capped at `MaxTraceStepsPerRun` (500); beyond it the collector keeps the first 500, sets
+already defines). The site collects events in a per-run `FlowTraceCollector` held by
-`Truncated`, and the audit rows remain complete. A site on an older build ignores `Trace`, returns
+`ScriptRuntimeContext` and attaches the list to the `ScriptCallResult` → `RouteToCallResponse`
-no `Steps`, and the UI labels its lane `site not traced (older build)`.
+when `Trace` is set. Capped at `MaxTraceEventsPerRun` (500); beyond it the collector keeps the
+first 500, sets `Truncated`, and the audit rows remain complete. A site on an older build ignores
+`Trace`, returns no `TraceEvents`, and the UI labels its lane `site not traced (older build)`.
+`FlowStep` is a **central-side projection** (`Commons/Types/Debugging/FlowStepProjector`)
+computed from `AuditEvent` + `AuditDetails`; nothing serializes it.
 
 For the value-change entry there is no routed reply to ride on. The debugger instead subscribes
 to the instance's debug stream (`SubscribeDebugView`, the Debug View's existing path) for the run's
 duration and takes the spawned run's `ExecutionId` from the stamped `AttributeValueChanged`, then
-pulls the site's trace rows for that id via a new `PullTraceSteps` RPC on `SiteStreamService`
+pulls the site's trace rows for that id via a new `PullTraceEvents` RPC on `SiteStreamService`
-(same PSK interceptor as `PullAuditEvents`; reads the site audit SQLite by `ExecutionId`). One
+(same PSK interceptor as `PullAuditEvents`; reads the site audit SQLite by `ExecutionId` /
-additive RPC, no streaming change.
+`ParentExecutionId`). One additive RPC, no streaming change.
 
 ## 6. Message and wire changes (all additive)
 
 | Contract | Change |
 |----------|--------|
 | `RouteToCallRequest` | `+ bool Trace = false` |
-| `RouteToCallResponse` | `+ Guid? ChildExecutionId`, `+ IReadOnlyList<FlowStep>? Steps` |
+| `RouteToCallResponse` | `+ Guid? ChildExecutionId`, `+ IReadOnlyList<AuditEvent>? TraceEvents` |
-| `ScriptCallRequest` / `ScriptCallResult` | `+ bool Trace`; `+ Guid ExecutionId`, `+ IReadOnlyList<FlowStep>? Steps` on the result |
+| `ScriptCallRequest` / `ScriptCallResult` | `+ bool Trace`; `+ Guid? ExecutionId`, `+ IReadOnlyList<AuditEvent>? TraceEvents` on the result |
-| `WriteAttributeBatchRequest`, `WaitForAttributeRequest` | `+ Guid? SourceExecutionId`, `+ bool Trace` |
+| `RouteToSetAttributesRequest` | `+ Guid? ParentExecutionId`, `+ bool Trace` |
-| `SetStaticAttributeCommand`, `AttributeValueChanged` | `+ bool Trace` (id already present) |
+| `SetStaticAttributeCommand`, `AttributeValueChanged` | `+ Guid? SourceExecutionId` (where missing), `+ bool Trace` |
-| `site_command.proto` | new fields on `RouteToCallRequestDto`/`ResponseDto`; new `FlowStepDto`; regenerate with `docker/regen-proto.sh sitecommand` |
+| `site_command.proto` | `trace` on `RouteToCallRequestDto`/`RouteToSetAttributesRequestDto`; `child_execution_id` + `repeated AuditEventDto trace_events` on `RouteToCallResponseDto` (no `FlowStepDto`); regenerate with `docker/regen-proto.sh sitecommand` |
-| `sitestream.proto` | `+ PullTraceSteps` RPC (`PullTraceStepsRequest { execution_id }` → `PullTraceStepsResponse { repeated FlowStepDto }`); `AttributeValueUpdate` `+ string source_execution_id = 7` so the debug stream can hand the debugger the spawned id |
+| `sitestream.proto` | `+ PullTraceEvents` RPC (`PullTraceEventsRequest { repeated execution_ids, since_utc, max_events }` → `PullTraceEventsResponse { repeated AuditEventDto events }`); `AttributeValueUpdate` `+ string source_execution_id = 7`, `+ bool trace = 8` so the debug stream can hand the debugger the spawned id |
 | `ApiMethod` | `+ TraceAllCalls bit NOT NULL DEFAULT 0` (EF migration + manual SQL script) |
-| `AuditChannel`/`AuditKind` | `ScriptTrace`; `RouteCall`, `ScriptRun`, `AttributeWrite`, `AttributeWait`, `TriggerFired` |
+| `AuditChannel`/`AuditKind` | `ScriptTrace`; `RouteCall`, `ScriptRun`, `AttributeWrite`, `AttributeWait` |
 
-`FlowStep` (Commons `Types/Debugging/FlowStep.cs`): `StepId`, `ExecutionId`, `ParentExecutionId`,
+`FlowStep` (Commons `Types/Debugging/FlowStep.cs`, **projection only — never on the wire**):
-`Kind`, `Lane` (`Central`/`Site`/`Tags`), `Title`, `StartedAtUtc`, `DurationMs`, `Outcome`,
+`EventId`, `ExecutionId`, `ParentExecutionId`, `Kind`, `Lane` (`Central`/`Site`/`Tags`), `Title`,
-`InputJson`, `OutputJson`, `Where` (site, node, instance, child path, connection), `SourceLine?`.
+`Subtitle`, `OccurredAtUtc`, `DurationMs`, `Outcome`, `InputJson`, `OutputJson`, `ErrorMessage`,
+`SiteId`/`Node`/`Instance`/`Target`, and a kind-specific `ScriptTraceExtra` parsed from
+`AuditDetails.Extra`.
 Field numbers never reused; proto3 defaults are the negotiation, as for stream batching.
 
 ## 7. Central components
@@ -186,22 +200,28 @@ Field numbers never reused; proto3 defaults are the negotiation, as for stream b
 ### 7.1 `FlowDebugService` (Central UI, scoped)
 
 - `PredictAsync(entry)` → §8.
-- `RunLiveAsync(entry, inputs, operator)` → dispatches a `MgmtFlowDebugRunCommand` through the
+- `RunMethodAsync` / `RunValueChangeAsync` / `ReplayAsync` → Live runs and Replay are
-  `ManagementActor` singleton so the method script and its `Route.To` calls execute on the
+  `FlowDebugRunMethodCommand` / `FlowDebugRunValueChangeCommand` / `FlowDebugReplayCommand` on the
-  **active** central node, honouring `IActiveNodeGate`'s rule that a standby never runs method
+  `ManagementActor` (Deployer role, long-running timeout). The `ManagementActor` is a **per-node**
-  scripts. The actor hands the run to a detached task (`PipeTo`) so a 45 s method does not block
+  actor (`AkkaHostedService`, `/user/management`), not a singleton. The run-method handler
-  its mailbox. Inbound entry: `InboundScriptExecutor.ExecuteAsync(method, inputs, route, timeout,
+  consults `IActiveNodeGate` and refuses on a standby with error code `STANDBY_NODE` naming the
-  parentExecutionId: root, trace: true)` with a `RouteHelper` whose `Trace` flag is set; the
+  design rule (Component-InboundAPI: method scripts and `Route.To` never run on a standby);
-  central steps (request, method run, route call, response) are recorded by the service itself and
+  Traefik routes UI traffic to the active node so this is rare. The Central UI calls it through
-  the site steps arrive on `RouteToCallResponse.Steps`. Value-change entry: §5.3 + §5.4.
+  `ManagementActorHolder` (the `DataConnectionMoveService` pattern) and the CLI through
+  `/management` — one path, one audit story. The inbound row for a Live run is written by the
+  handler via `ICentralAuditWriter` (kind `InboundRequest`, actor = operator username,
+  `Extra.source = "flow-debugger"`). Inbound entry: `InboundScriptExecutor.ExecuteAsync(method,
+  inputs, route, timeout, parentExecutionId: root, trace: true)` with a `RouteHelper` whose
+  `Trace` flag is set and whose inline trace sink collects the `RouteCall` row plus the site's
+  `TraceEvents`. Value-change entry: §5.3 + §5.4.
 - `ReplayAsync(executionId)` → `IAuditLogRepository.GetExecutionTreeAsync` + a new
-  `GetTraceStepsAsync(rootExecutionId)` (all `ScriptTrace` rows in the tree, plus the
+  `GetTraceEventsAsync(rootExecutionId)` (all `ScriptTrace` rows in the tree, plus the
   `InboundRequest` row) → `FlowGraphBuilder`.
 
 ### 7.2 `FlowGraphBuilder` (pure, Commons or Central UI)
 
 Steps → `FlowGraph { Lanes, Nodes, Edges }`. Lane assignment by `Where` (central node → Central;
-site node → Site; `AttributeWrite`/`TriggerFired` → Tags). Edges follow emission order within an
+site node → Site; `AttributeWrite` → Tags). Edges follow emission order within an
 execution and parent→child across executions; an edge whose endpoints sit on different lanes is
 marked `CrossesBoundary`. A predicted graph and a real graph share the model; the page overlays
 them (predicted-but-not-executed → greyed).
@@ -250,20 +270,23 @@ surface); the walker is syntax-only and never executes anything.
   restricts which instances a value-change entry may target.
 - Trace payloads pass through the existing redaction policy (auth headers redacted, 8 KB cap,
   64 KB on error rows). Console output is capped the same way.
-- Nothing here touches the PSK boundary; `PullTraceSteps` sits behind `ControlPlaneAuthInterceptor`.
+- Nothing here touches the PSK boundary; `PullTraceEvents` sits behind `ControlPlaneAuthInterceptor`.
 
 ## 10. Volume and failure behaviour
 
 - Untraced production is unchanged except one `RouteCall` row per routed call (inbound-driven).
 - A traced Delmia call emits ≈ 1 `InboundRequest` + 1 `RouteCall` + 1 `ScriptRun` + 2
-  `AttributeWrite` + 1 `AttributeWait` + 1 `TriggerFired` ≈ 7 rows. `TraceAllCalls` on a
+  `AttributeWrite` + 1 `AttributeWait` + 1 value-change `ScriptRun` ≈ 7 rows. `TraceAllCalls` on a
   100-call/day method is ~700 rows/day.
 - Trace emission is best-effort like all audit (a failed trace write never fails the run).
 - Live run timeout = method timeout + `FlowDebugRunGrace` (10 s); a timeout renders whatever steps
   arrived and marks the run `Timed out`. The site's trace rows still land later, so Replay of the
   same ExecutionId is complete.
-- Older site build: no `Steps`, lane labelled; older central build: ignores new fields; proto3
+- Older site build: no `TraceEvents`, lane labelled; older central build: ignores new fields; proto3
   defaults negotiate as for stream batching.
+- **Mixed-version caveat:** an OLD central ingesting `ScriptTrace` rows from a NEW site parses
+  unknown channel/kind names to the `AuditRowProjection` fallbacks (`ApiInbound`/`InboundRequest`);
+  upgrade central first.
 
 ## 11. Out of scope (recorded so they are not rediscovered)
 
@@ -271,23 +294,24 @@ surface); the walker is syntax-only and never executes anything.
   shared scripts (they execute inline; only `Scripts.Call` spawns a traceable child). Live
   step-by-step / breakpoints. Editing a script from the debugger. Cross-run comparison. A
   `Vertical trace` list toggle (mockup Direction B) — cheap follow-up on the same `FlowGraph`.
-  Line-level pinning (Direction C) — needs per-statement instrumentation.
+  Line-level pinning (Direction C) — needs per-statement instrumentation. Console output capture
+  on `ScriptRun` rows (no script console exists today).
 
 ## 12. Testing
 
 - **Pure:** `FlowGraphBuilderTests` (lane/edge/boundary rules, truncation), `FlowShapePredictorTests`
   (each recognised site, constant vs input-dependent target, one-hop route resolution, depth cap,
   early-return annotation), `FlowTraceCollectorTests` (cap + `Truncated`).
-- **Site runtime:** `InstanceActor` traced write emits `AttributeWrite` and arms; echo consumes the
+- **Site runtime:** `ScriptRuntimeContext` traced write emits `AttributeWrite`; `InstanceActor` arms; echo consumes the
   arm and stamps `SourceExecutionId`/`Trace`; expiry emits nothing; untraced write emits nothing
   and arms nothing (the production-unchanged pin). `ScriptRunLauncher` emits `ScriptRun` only when
-  traced. `HandleWaitForAttribute` emits `AttributeWait` for satisfied/timeout.
+  traced. `ScriptRuntimeContext.WaitInternal` emits `AttributeWait` for satisfied/timeout.
 - **Inbound API:** `RouteHelper.Call` always writes `RouteCall`; `ChildExecutionId` round-trips;
   `Trace` propagates to `RouteToCallRequest`.
 - **Communication:** DTO mapper round-trips for every new field; an old-shape response (no
-  `Steps`) maps to null.
+  `TraceEvents`) maps to null.
 - **Audit:** new kinds accepted by ingest; per-channel retention deletes `ScriptTrace` rows early;
-  `GetTraceStepsAsync` returns the tree's rows in order.
+  `GetTraceEventsAsync` returns the tree's rows in order.
 - **Central UI (bUnit):** page renders predicted graph, overlays real graph, Run button hidden
   without Deployer, Replay degrades to the collapsed `not traced` node.
 - **Rig:** extend `docker/verify-delmia-notifier.sh` with step H — a Live run of
@@ -298,7 +322,7 @@ surface); the walker is syntax-only and never executes anything.
 
 `Component-CentralUI.md` (new page), `Component-InboundAPI.md` (RouteCall row, TraceAllCalls,
 Live-run actor), `Component-SiteRuntime.md` (trace collector, trace arm, gated emission),
-`Component-AuditLog.md` (ScriptTrace channel, retention override, PullTraceSteps),
+`Component-AuditLog.md` (ScriptTrace channel, retention override, PullTraceEvents),
 `Component-Communication.md` (proto changes), `Component-ScriptAnalysis.md` (predictor),
 `Component-ConfigurationDatabase.md` (migration), `README.md` component table if a component is
 added (none planned — the debugger is a Central UI page plus seams in existing components),