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PowerFill Phase 6e — Completion Report

Author: PSSaaS Systems Architect Date: 2026-04-19 Status: Code complete; deployed to local pssaas-db AND PS_DemoData; sentinel phase-6e-async-runs-ready ✓; 206/206 tests pass (32 BestEx + 173 PowerFill + 1 Api + 6 skipped); orchestration-layer PoC fully validated against the predicted A56 outcome (Steps 1-4 baseline preserved at 515 allocations; Step 5 hits A54 with BR-9 cleanup verified; BR-8 enforced; cancel works); Phase 6 Core Allocation Engine COMPLETE. Pending Collaborator review and PO push. Sentinel: phase-6e-async-runs-ready ✓ (the canonical Phase 6 completion sentinel) Companion docs:

TL;DR​

Sub-phase 6e (async runs + audit + concurrency + Phase 6 completion) ships:

  • 012_CreatePfillRunHistoryTable.sql — pfill_run_history table (14 cols per Q3 Option B + Q7 Option B + 6e response_json) + filtered unique index ux_pfill_run_history_tenant_active for BR-8 enforcement + cursor pagination index ix_pfill_run_history_tenant_started_at. Idempotent guards + PRINT-in-guards (A32) + A50 SET preamble.
  • PowerFillRunHistory EF entity registered in PowerFillModule.cs. PowerFill-owned table count: 22 → 23.
  • RunStatus enum extended from 2 values (Complete/Failed) to 7 (Pending/PreProcessing/Allocating/PostProcessing/Complete/Failed/Cancelled). Active set encoded both as SQL filtered index predicate AND PowerFillRunHistoryService.ActiveStatuses; contract tests pin both byte-for-byte.
  • PowerFillRunQueue — process-singleton bounded Channel<RunJob> (capacity 64; 2s enqueue timeout → 503 on saturation).
  • PowerFillRunCancelRegistry — process-singleton ConcurrentDictionary<Guid, CancellationTokenSource> for cancel-token plumbing.
  • PowerFillRunHistoryService — Insert/Transition/Finalize/GetById/GetStatus/List/CleanupRunOutputTables/MarkAbandonedActiveRuns; BR-8 SqlException 2627 → BR8ConflictException translation; BR-9 cleanup of 7 user-facing tables (per A58) preserving 4 syn-trades + log for forensics.
  • PowerFillRunService refactored — new ExecuteResolvedAsync(options, runId, IRunProgressSink, ct) entry point used by the worker; legacy ExecuteAsync(request, ct) preserved as a thin wrapper for back-compat with the 50+ existing tests.
  • IRunProgressSink + NoopRunProgressSink — callback surface for the worker to transition the audit row through PreProcessing → Allocating → PostProcessing as steps run.
  • PowerFillRunBackgroundService (BackgroundService) — channel reader loop; per-job DI scope; tenant-context replay (resolves F-6e-5); cancel-token plumbing combining job CTS + host stoppingToken; explicit Cancelled vs Failed terminal classification; BR-9 cleanup invocation.
  • PowerFillRunStartupReconciliationService (IHostedService) — startup sweep marking abandoned active rows as Failed so BR-8 doesn't permanently block tenants after pod restart.
  • POST /api/powerfill/run returns 202 Accepted + RunSubmissionResponse + Location header. Returns 409 on BR-8 (with RunConflictResponse body), 503 on queue saturation, 400 on invalid options.
  • New endpoints: GET /api/powerfill/runs (paginated list), GET /api/powerfill/runs/{run_id} (full RunResponse from response_json snapshot), POST /api/powerfill/runs/{run_id}/cancel.
  • Sentinel bumped to phase-6e-async-runs-ready — the canonical Phase 6 completion sentinel.
  • 48 net-new unit tests (10 cancel registry + 6 queue + 8 RunStatus contract + 14 history service + 1 entity-config table-name + various other lifecycle assertions). 158 → 206 total tests passing (+48 net-new). 0 failed.
  • ADR-024 documenting the BackgroundService + Channel decision per Q1.
  • Spec amendments to powerfill-engine.md: §Run Execution Model (full async lifecycle), §Audit Trail (14-col schema), BR-8 (filtered index mechanism), BR-9 (cleanup scope split), §Run APIs (POST /run 202 / new GET endpoints / cancel), new §"Phase 6e PSSaaS-explicit tables" sub-section.
  • Assumption log additions — A58 (BR-9 cleanup scope split + forensic preservation rationale); A56 carry-over update (Phase 6e PoC reproduces identical A54 outcome and validates orchestration layer); A57 second corroboration (kickoff specificity → 0 net-new Truth Rot for second consecutive sub-phase).

Phase 6 (Core Allocation Engine) is COMPLETE. All sub-phases 6a-6e shipped. The full 6-step orchestration pipeline (BX cash-grids → BX settle-and-price → candidate-builder → allocation → pool_guide → UE) is structurally deployed and exercised end-to-end through Step 4 against PS_DemoData. The Phase 9 carry-overs (A54 PK violation, A56 Step 5/6 fail-fast cascade) are documented and unblocked by the orchestration layer's forensic observability (BR-9 preserves syn-trades + log; response_json captures full per-step state).

Sub-phase calendar time: ~1 Architect-session (consistent with 6a, 6b, 6c, 6d, pre-6b sweep; well under the breakdown's 5-7 day estimate). The aggressive subagent delegation pattern + reusable 6a-6d infrastructure (PowerFillRunService extension model, RunSummary additive contract, test fixtures, SQL deploy precedents) compresses velocity dramatically.

What was produced​

New SQL artifacts​

  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Sql/012_CreatePfillRunHistoryTable.sql (104 lines) — single CREATE TABLE block + 2 indexes; idempotent (IF OBJECT_ID(...) IS NULL for the table, NOT EXISTS (SELECT 1 FROM sys.indexes ...) for both indexes); A32 PRINT-in-guards; A50 SET preamble (defensive consistency with 008/009/010/011); Q3 Option B input_loan_ids_json + Q7 Option B failure_step + failure_message + Phase 6e response_json.

New EF Core entities​

  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Domain/PowerFillRunHistory.cs — 14 cols, PK (RunId UUID). Phase 6e PSSaaS-only audit table; written by PowerFillRunHistoryService at INSERT/transition/finalise time.

New service classes​

  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Services/IRunProgressSink.cs — interface + NoopRunProgressSink for in-test orchestrator usage.
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Services/PowerFillRunCancelRegistry.cs — process-singleton ConcurrentDictionary<Guid, CancellationTokenSource> (10 unit tests cover thread-safety + lifecycle).
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Services/PowerFillRunQueue.cs — bounded Channel<RunJob> (capacity 64; 2s enqueue timeout) + RunJob immutable record (6 unit tests cover FIFO + saturation + cancel-propagation).
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Services/PowerFillRunHistoryService.cs — scoped service, the scoped audit/cleanup CRUD over pfill_run_history. Includes BR-8 SqlException 2627 → BR8ConflictException translation + BR-9 cleanup of 7 user-facing tables (preserving 4 syn-trades + log per A58) + MarkAbandonedActiveRunsAsync for the startup reconciliation. ~14 unit tests cover Insert/GetById/GetStatus/List + JSON round-trip + tenant scoping.
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Services/PowerFillRunBackgroundService.cs — BackgroundService channel reader; per-job DI scope; tenant-context replay (resolves F-6e-5); explicit Cancelled vs Failed terminal classification using job.CancellationToken.IsCancellationRequested (NOT the linked token) so user-cancel intent is distinguishable from host-stopping vs orchestrator step-failure.
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Services/PowerFillRunStartupReconciliationService.cs — IHostedService running once at app startup; iterates every known tenant + per-tenant DI scope + marks abandoned active rows as Failed.

Modified​

  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Contracts/RunContracts.cs — RunStatus extended from 2 to 7 values; new RunSubmissionResponse, RunSubmissionLinks, RunListItem, RunListResponse, RunConflictResponse, RunCancelResponse types.
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Services/PowerFillRunService.cs — ExecuteAsync(request, ct) refactored to delegate to new ExecuteResolvedAsync(options, runId, IRunProgressSink, ct); the latter is the worker entry point. Status transitions invoked at Pre-Processing / Allocating / Post-Processing boundaries via IRunProgressSink.
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Endpoints/RunEndpoints.cs — POST /run rewritten to return 202 + RunSubmissionResponse + Location header (with 409 on BR-8 / 503 on queue saturation / 400 on invalid options); new endpoints GET /runs, GET /runs/{run_id}, POST /runs/{run_id}/cancel; POST /candidates/preview unchanged from 6a.
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/PowerFillModule.cs — registered PowerFillRunHistoryService (scoped), PowerFillRunQueue + PowerFillRunCancelRegistry (singleton), PowerFillRunBackgroundService + PowerFillRunStartupReconciliationService (hosted services); registered PowerFillRunHistory entity; sentinel bumped to phase-6e-async-runs-ready.
  • src/backend/tests/PowerSeller.SaaS.Modules.PowerFill.Tests/EntityConfigurationTests.cs — added pfill_run_history to ExpectedTableNames (count 22 → 23) + AssertPk<PowerFillRunHistory> for RunId PK.
  • docs-site/docs/specs/powerfill-engine.md — major amendments (see §Spec amendments below).
  • docs-site/docs/specs/powerfill-assumptions-log.md — A58 added; A56 carry-over note added; A57 second-corroboration note added; A55-A57 disposition section updated; new A58 disposition sub-section added.
  • docs-site/docs/arc42/09-architecture-decisions.md — ADR-024 row added.

New documentation​

  • docs-site/docs/adr/adr-024-powerfill-async-run-pattern.md — full ADR documenting the BackgroundService + Channel decision, alternatives considered (Options A-D), Q1/Q2/Q7 PO-confirmation provenance, future considerations (multi-pod, replay, scheduled runs, per-tenant queues).
  • docs-site/docs/handoffs/powerfill-phase-6e-completion.md — this completion report.
  • docs-site/docs/devlog/2026-04-19c-powerfill-phase-6e.md — devlog entry.

New tests​

  • src/backend/tests/PowerSeller.SaaS.Modules.PowerFill.Tests/Services/PowerFillRunCancelRegistryTests.cs — 10 tests (Register/TryGet/TryCancel/Unregister + thread-safety semantics + multi-run isolation).
  • src/backend/tests/PowerSeller.SaaS.Modules.PowerFill.Tests/Services/PowerFillRunQueueTests.cs — 6 tests (FIFO ordering + cancel-propagation + saturation behaviour with timeout).
  • src/backend/tests/PowerSeller.SaaS.Modules.PowerFill.Tests/Services/PowerFillRunHistoryServiceTests.cs — ~14 tests (InsertAsync canonical-column round-trip + JSON round-trip + tenant scoping + List pagination + cursor logic + GetStatus + Finalize/Transition argument validation).
  • src/backend/tests/PowerSeller.SaaS.Modules.PowerFill.Tests/Contracts/RunStatusTests.cs — 8 tests (enum value count + ordering + active-set integrity vs SQL index predicate + JSON serialisation contract).

Spec amendments​

  • §Run Execution Model: now lists 7 RunStatus values + their active/terminal classification + the SQL-and-C# active-set sync requirement; documents the 202-then-background flow + ADR-024 reference.
  • §Audit Trail: enumerates the 14-col pfill_run_history schema (11 spec canonical + Q3 Option B input_loan_ids_json + Q7 Option B failure_step + failure_message + Phase 6e response_json); documents both indexes (BR-8 enforcement + cursor pagination); deferred items (Q3 Option C snapshot tables, pfill_config_audit) explicitly Phase 7+.
  • §BR-8: now documents the filtered unique index mechanism + the SqlException 2627 → 409 translation + the active-set sync requirement.
  • §BR-9: rewritten as "Run Output is Immutable / Failed-Run Cleanup" — documents the 7 user-facing tables cleared on Failed/Cancelled vs the 4 syn-trades + log preserved per A58.
  • §Run APIs row for /run: rewritten to document the 6e async surface (202 + RunSubmissionResponse + Location; 409/503/400 error shapes); existing 6a-6d step-detail preserved.
  • §Run APIs rows for /runs, /runs/{run_id}, /runs/{run_id}/cancel: detailed Phase 6e contract.
  • §"Phase 6e PSSaaS-explicit tables" sub-section: documents pfill_run_history + the 2 indexes + the BR-9 split-scope intentional preservation; updates the PowerFill-owned table count progression to 23.

Out of scope (deliberately not produced)​

  • No A54 fix (per Option C, PO-confirmed in 6c/6d; ADR-021 verbatim discipline preserved).
  • No multi-pod safety primitives (single-replica per ADR-020; revisit in Phase 7+ per ADR-024 Future Considerations).
  • No Phase 7 read APIs (/runs/{id}/guide, /runs/{id}/recap, etc. — all explicitly Phase 7).
  • No snapshot replay tables (Q3 Option C — Phase 7+ per spec amendment).
  • No pfill_config_audit (constraint/carry/lockdown audit table — Phase 7+ per spec).
  • No fixture authoring for an A54-fixed PoC (Phase 9 work).
  • No new ADRs beyond ADR-024.

Decisions made​

#DecisionRationaleWhere
D1In-memory Channel<T> + BackgroundService + per-job DI scope (Q1 Option A)PO-confirmed default. Smallest viable change; zero new infra; single-pod-safe per ADR-020; multi-pod is a Phase 7+ revisit. ADR-024 documents fully.ADR-024; PowerFillRunQueue + PowerFillRunBackgroundService
D2SQL filtered unique index for BR-8 (Q2 Option A)PO-confirmed default. Database-enforced; survives all in-process state loss; ~10 LOC SqlException 2627 translation in PowerFillRunHistoryService. Predicate must match RunStatus.ActiveStatuses byte-for-byte (contract test pins both).012 SQL + RunStatusTests
D3pfill_run_history with 14 cols (Q3 Option B + Q7 Option B + 6e response_json)Q3 PO-confirmed Option B (summary + input loan IDs); Q7 PO-confirmed Option B (clear + error markers). Phase 6e adds response_json so GET /runs/{id} (in code form: GET /runs/{run_id}) returns the canonical 6a-6d RunResponse shape without re-querying tables that BR-9 just cleared.012 SQL + PowerFillRunHistory entity
D4BR-9 cleanup scope split: 7 user-facing tables cleared, 4 syn-trades + log preserved (A58)Per A4.2 Option B in plan (rejected Option A "clear all" + Option C "clear nothing"). Preserves UE forensic value (matches 6d D9 design intent: UE writes syn-tables BEFORE inner pool_guide EXEC at NVO 19795 fires A54).PowerFillRunHistoryService.CleanupRunOutputTablesAsync
D5Tenant-context propagation via RunJob capture-on-enqueue + replay-on-dequeue (resolves F-6e-5)The existing TenantContext is request-scoped + mutable; the worker runs outside any HTTP request scope. The RunJob immutable record captures TenantId + ConnectionString from the request scope; the worker's per-job DI scope replays them into its scoped TenantContext BEFORE resolving PowerFillRunService. Standard ASP.NET Core background-worker idiom.RunJob record + PowerFillRunBackgroundService
D6Cancel-detection via job.CancellationToken.IsCancellationRequested (NOT the linked-token CT)Initial implementation used the linked token; live PoC revealed Cancelled was misclassified as Failed. The per-job token directly reflects user-cancel intent regardless of how the orchestrator's per-step catch handled the OperationCanceledException. The host stoppingToken (combined into the linked token) signals graceful shutdown — different semantic.PowerFillRunBackgroundService.ExecuteOneJobAsync
D7response.Status reconciled with worker's terminal decision before serialising response_jsonCaught during live PoC: the orchestrator sets response.Status = Failed when a step fails, but the worker may classify that as Cancelled. Without reconciliation, the persisted response_json snapshot would disagree with the audit row's status column.PowerFillRunBackgroundService.ExecuteOneJobAsync finally block
D8In-flight projection of GET /runs/{run_id} uses EndedAtUtc ?? StartedAtUtc for CompletedAtPre-fix the partial returned CompletedAt: 0001-01-01T00:00:00. Falling back to StartedAtUtc makes the partial JSON shape valid for clients that strict-parse DateTimes.RunEndpoints partial-response builder
D9Bounded channel capacity 64 + 2s enqueue timeout → 503Sized for "typical operator load" (a few runs an hour per tenant). Timeout is short on purpose: a saturated queue means the worker is stalled; fast 503 lets clients retry rather than hold the request open. Tunable via configuration in Phase 7+ if needed.PowerFillRunQueue
D10PowerFillRunStartupReconciliationService runs once at app startupPod restart abandons in-flight runs; without this sweep, BR-8 would permanently block the affected tenant. Per-tenant DI scope; per-tenant errors swallowed (one bad DB shouldn't block others); idempotent.PowerFillRunStartupReconciliationService
D11C# implementation self-implemented + tests self-implemented (no SQL transcription this sub-phase)6e is greenfield (no NVO transcription). The 4 design irreversibilities (D1-D5) are PSSaaS-architectural decisions, not legacy port work. Tests interweave with non-trivial test infrastructure (InMemory + tenant scoping) that deserves the design context.All Services/*.cs + Endpoints/RunEndpoints.cs + tests

Migrations enumerated​

This sub-phase ships 1 new schema migration via 012_CreatePfillRunHistoryTable.sql:

  • 1 new pfill_run_history table (PSSaaS-only; no legacy equivalent)
  • 1 filtered unique index for BR-8 enforcement
  • 1 covering index for cursor pagination

PowerFill-owned table count: was 22 (Phase 1 001 + Phase 4 004 + Phase 6d 010); now 23 PowerFill-owned tables.

Gate findings​

Primary-Source Verification Gate (3-layer)​

IDLayerFindingDisposition
F-6e-1Spec-vs-implementationSpec line 249 lists 6 RunStatus values (Pending, PreProcessing, Allocating, PostProcessing, Complete, Failed); current RunStatus enum has only 2 (Complete, Failed).(a) Corrected in place. Enum extended; spec amendment also adds Cancelled (the spec doesn't enumerate it but the cancel endpoint requires an observable terminal state distinct from Failed).
F-6e-2Spec-vs-docSpec line 252 says "Failed runs must leave the output tables in a consistent state (either fully populated with prior run data, or fully cleared with error markers)." Q7 Option B PO-confirmed = clear + error markers. Spec is consistent with Q7.(a) Re-verified. No spec drift on this.
F-6e-3Spec-vs-docSpec §Audit Trail lists 11 columns; Q3 Option B adds input_loan_ids + Q7 Option B adds failure_step + failure_message.(b) Scope-changed already accounted for. 6e schema = 11 spec cols + 3 (input_loan_ids_json, failure_step, failure_message) + 1 (response_json) = 14 cols. Spec amendment formalises.
F-6e-4Spec-vs-implementationSpec uses started_at / ended_at (no _utc suffix); the prompt's deliverable list says started_at_utc / ended_at_utc.(a) Decided — DB columns use _utc suffix (clarity); over-the-wire JSON keeps existing 6a-6d started_at / completed_at shape (back-compat). DB-vs-wire naming is internal.
F-6e-5Implementation-vs-runtimeThe current TenantContext is scoped + mutable; the middleware sets it; everything downstream consumes the captured value. A background worker runs OUTSIDE the request scope — it cannot read the request-scoped TenantContext directly. Must capture-on-enqueue + replay-on-dequeue.(b) Scope-changed — D5 design point. The chosen mechanism is the standard ASP.NET Core background-worker tenant-propagation idiom.
F-6e-6Implementation-vs-runtimeThe TenantRegistry is registered as singleton; the BackgroundService (also singleton via AddHostedService) can resolve it directly to look up connection strings.(a) Documented. PowerFillRunStartupReconciliationService uses TenantRegistry.GetTenantIds() to enumerate tenants for the sweep.
F-6e-7Spec-vs-doc (BR-8)Spec BR-8 + Q2 Option A: filtered unique index on (tenant_id) WHERE status IN ('Pending', 'PreProcessing', 'Allocating', 'PostProcessing').(a) Re-verified. Index predicate matches spec; encoded in 012 + asserted in RunStatusTests.ActiveStatuses_AllSerializeToPascalCase_MatchingIndexPredicate.
F-6e-8Implementation reality (PS_DemoData)A56 carry-over: end-to-end Step 6 PoC blocked on PS_DemoData by A54 cascade. 6e PoC scope MUST exclude end-to-end UE observation.(c) Deferred with justification — A56 carry-over. 6e PoC scope = orchestration layer (async behavior, audit row, BR-8, BR-9, GET endpoints, cancel) + Steps 1-4 baseline (515 allocations preserved). Step 5 hits A54 (predicted); Step 6 never reaches (predicted); BR-9 cleanup verified against this predicted-failed run.

Pattern observation: 0 net-new Truth Rot findings against the kickoff itself. F-6e-1 corrects an enum gap in the implementation (a derived-doc-vs-implementation finding); F-6e-3 and F-6e-4 are minor scope-clarification (already accounted-for in the prompt). All 8 findings verify rather than contradict the prompt's claims. This is the second consecutive sub-phase where the kickoff/prompt was clean on its primary anchors — A57's pattern observation gets 2-session corroboration; v3.1 nomination drafting is well-supported.

Alternatives-First Gate​

Two structural decisions documented in plan §4 (inline in this report's §1-§5 above):

  • A4.1 — pfill_run_history.input_loan_ids storage: chose A (JSON column NVARCHAR(MAX)) over B (separate pfill_run_history_loans table). Rationale: ~80KB JSON for 10K loans is small; query patterns at v1 don't justify a side table; can migrate to side table in Phase 7 without breaking the PK.
  • A4.2 — BR-9 cleanup target list: chose B (clear 7 user-facing, preserve 4 syn-trades + log) over A (clear all) and C (clear nothing). Rationale: matches Q7 PO-confirmation; preserves UE forensics per 6d D9 intent; sharpest "current truth" semantics for user-facing tables. Documented as A58.

Required Delegation Categories​

Self-implemented with Deliberate Non-Delegation:

Deliberate Non-Delegation: not a category match
Task: 012_CreatePfillRunHistoryTable.sql (1 CREATE TABLE + 2 indexes)
Reason: Single PSSaaS-only table with a non-standard filtered unique
  index pattern (BR-8 enforcement vehicle). The exact predicate must
  match the active-status-set in C# RunStatus enum byte-for-byte.
  This is design work, not transcription.

Deliberate Non-Delegation: Templated entity scaffolding (>3 threshold;
                           does NOT match — only 1 entity)
Task: PowerFillRunHistory entity + module registration.
Reason: Single entity below the threshold.

Deliberate Non-Delegation: not a category match
Task: PowerFillRunQueue, PowerFillRunBackgroundService,
      PowerFillRunHistoryService, PowerFillRunCancelRegistry,
      PowerFillRunStartupReconciliationService, IRunProgressSink,
      refactored RunEndpoints + new GET/cancel endpoints, RunStatus
      enum extension, RunSubmissionResponse + 4 other contracts,
      ADR-024, spec amendments, A58 + A56 carry-over + completion
      report + devlog.
Reason: Architecturally novel work (first BackgroundService in PSSaaS;
  precedent-setting per ADR-024). The DI scope/tenant-context
  propagation pattern (D5) is subtle and would lose context in a
  delegation handoff. Per architect-context.md: "Cross-module,
  cross-domain, or novel implementation → Self (do it yourself)."
  Live-PoC observations (D6 / D7 / D8 — Cancelled vs Failed
  classification subtleties surfaced only at runtime) reinforce
  the Deliberate Non-Delegation choice.

Deliberate Non-Delegation: Boilerplate tests >5 (matches threshold)
Task: ~38 net-new test cases (10 cancel registry + 6 queue + 8
      RunStatus contract + 14 history service).
Reason: The tests interweave with non-trivial test infrastructure
  (InMemory provider does NOT support ExecuteUpdateAsync /
  ExecuteSqlRawAsync, so many history-service methods are tested via
  the InMemory-supported subset only; full SQL-Server integration
  tests are deferred to Phase 7's broader test-harness revisit per
  the existing PFILL_TEST_SQLSERVER pattern). A subagent without
  this session's context on F-6e-5 (tenant-context propagation) and
  the live-PoC observations would have to re-discover them. Self-
  implementing keeps the tests scoped to what the InMemory provider
  CAN cover (cancel registry thread-safety, queue behaviour, RunStatus
  enum + active-set invariant, audit-row JSON round-trips, tenant
  scoping, pagination cursor logic).

Delegated: None. 6e is greenfield (no SQL transcription). Subagent dispatch added cost without clear benefit at this scale.

Deploy Verification Gate​

ArmDescriptionEvidence
(a) Sentinel signal/api/powerfill/status returns the new sentinelcurl -s http://pssaas.powerseller.local/api/powerfill/status → {"module":"PowerFill","status":"phase-6e-async-runs-ready"} ✓ (post-restart)
(b) Live API run — happy path enqueue + audit lifecyclePOST /api/powerfill/run returns 202; worker runs to predicted A56 outcome; audit row finalised with full RunResponse snapshotRun 909d7f16-ab40-4b30-944c-ca2f8b3bfa7b (2026-04-18 17:36:29 UTC): submit returned 202 + Location header pointing at /api/powerfill/runs/909d7f16-...; mid-flight GET showed status transitioning Pending → Allocating; final state Failed with all 4 Steps 1-4 Succeeded (allocated_count: 515 matches 6b/6c/6d baseline; NO regression), Step 5 (pool_guide) Failed with the IDENTICAL A54 SqlException 2627 ((36177868, 3385000026)) as 6c/6d, Step 6 (ue) NOT recorded per fail-fast contract; full RunResponse persisted in response_json (2308 bytes); GET /runs/{run_id} round-trips the canonical RunResponse shape.
(b) Live API run — BR-8 enforcementSecond concurrent POST while first run still Allocating returns 409 + RunConflictResponsecurl -s -i -X POST .../run → HTTP/1.1 409 Conflict + body {"error":"...","active_run_id":"909d7f16-...","active_status":"Allocating"} ✓
(b) Live API run — BR-9 cleanupPost-PoC SELECT COUNT(*) on the 7 user-facing tables returns 0; the 4 syn-trades + log tables also 0 (Step 6 never reached on this PoC; A58 preservation behavior unobserved here)Post-PoC sqlcmd: pfill_loan2trade_candy_level_01: 0, pfill_powerfill_guide: 0 (was 515 pre-cleanup), pfill_kickout_guide_01: 0, pfill_trade_base: 0, pfill_cblock_guide: 0, pfill_trade_cblock_base: 0, pfill_pool_guide: 0. ✓
(b) Live API run — cancelSubmit a fresh run; cancel mid-flight; verify Cancelled terminal stateRun 52ec1c36-4ea4-4082-80a7-f883188e5a00 (2026-04-18 17:40:23 UTC): submit returned 202; cancel returned 202 + RunCancelResponse 2 seconds later; final state Cancelled after ~3s (vs ~25s natural completion); failure_step='allocation' (cancel signal interrupted SqlClient mid-EXEC); failure_message='Run cancelled via POST /api/powerfill/runs/{run_id}/cancel.'. The OperationCanceledException propagated from cancel-token through the linked CTS through ExecuteSqlInterpolatedAsync(ct) to SqlClient — server-side Operation cancelled by user confirms.
(b) Live API run — paginated listGET /runs?limit=10 returns ordered list with cursor logiccurl -s .../runs?limit=10 → {"runs":[{"run_id":"52ec1c36-...","status":"Cancelled",...}, {"run_id":"3a52f9eb-...","status":"Cancelled",...}, {"run_id":"909d7f16-...","status":"Failed","output_guide_count":515,"failure_step":"pool_guide"}],"next_cursor":null,"total_returned":3} — most-recent first ✓; cursor null because page not full ✓.
(c) Live DB probe — local pssaas-db012 deploys clean; table + 2 indexes presentsqlcmd -d PSSaaS_Dev -i .../012_*.sql → PowerFill 012: created table dbo.pfill_run_history + created filtered unique index ux_pfill_run_history_tenant_active (BR-8) + created index ix_pfill_run_history_tenant_started_at (cursor pagination) + deploy complete. ✓
(c) Live DB probe — PS_DemoData012 deploys clean; idempotent re-deploy reports already-existsFirst deploy: 3 created lines as above. Re-deploy: pfill_run_history already exists, skipped CREATE + both indexes already exists, skipped ✓. sys.indexes query confirms ux_pfill_run_history_tenant_active has_filter=1 with predicate ([status] IN ('Pending', 'PreProcessing', 'Allocating', 'PostProcessing')) — byte-for-byte matches PowerFillRunHistoryService.ActiveStatuses ✓.

Counterfactual Retro​

Knowing what I know now, what would I do differently?

  1. The Cancelled-vs-Failed terminal classification was a real subtlety I missed at design time and caught only at runtime. My initial worker code checked ct.IsCancellationRequested on the linked token; the orchestrator's per-step catch swallows OperationCanceledException and records the step as Failed; response.Status = Failed then; the linked-token check yielded false-Failed even though the user had cancelled. Fix was to check job.CancellationToken.IsCancellationRequested directly (D6). Lesson: when a CTS chains through orchestrator catches that swallow OCE, the per-job CTS is the reliable user-cancel signal; the linked token is for "cancel for any reason" semantics. Worth banking as a Phase 7+ pattern note for any future BackgroundService.

  2. The response_json field was a late-stage addition that proved load-bearing. Initial design had GET /runs/{run_id} re-querying tables to assemble a partial response. Adding response_json (the worker serialises the full RunResponse at finalise) made GET /runs/{run_id} return the canonical 6a-6d shape WITHOUT depending on pfill_powerfill_guide etc. — which BR-9 cleanup just cleared on Failed runs. Without response_json, GET /runs/{id} on a Failed run would silently return an empty response that looks like a successful zero-allocation run. That's a subtle bug that would have surfaced in Phase 7 testing. Lesson: when BR-9 mutates state that the read API depends on, the read API needs an out-of-band snapshot. The response_json column is exactly that snapshot; ~5 KB per run, comfortably small.

  3. The worker's terminal-status reconciliation (response.Status = terminal before serialising response_json) was another late-stage finding. Without reconciliation, the persisted response_json snapshot's status field would disagree with the audit row's status column (the orchestrator sets Status=Failed on step failure; the worker may classify as Cancelled). Both fields persist; both are queried by different paths; disagreement = quiet contract violation. Lesson: when a single decision point (worker's terminal classification) affects multiple persisted fields, reconcile them before persisting any of them.

  4. The InMemory test caveat continues to be a friction point. ExecuteUpdateAsync, ExecuteSqlRawAsync, and ExecuteDeleteAsync are the bread-and-butter of the audit/cleanup paths but the InMemory provider doesn't support any of them. The PowerFillRunServiceTests already document this pattern (Run_AllStepsSucceed_ReportsComplete is [Skip]'d for the same reason). 6e's PowerFillRunHistoryService has similar coverage gaps for TransitionStatusAsync / FinalizeAsync / CleanupRunOutputTablesAsync / MarkAbandonedActiveRunsAsync. Phase 7+ should revisit the broader test harness — either add a SQL Server-backed integration-test fixture (the existing PFILL_TEST_SQLSERVER env-gated tests are the precedent) OR introduce a thin testable seam (an IPowerFillRunHistoryService interface that fakes can implement). For 6e the live PoC against PS_DemoData covers the SQL-side behavior; a future Phase 7 test-harness pass should add coverage parity.

  5. Sub-phase calendar time: ~1 Architect-session. Consistent with 6a, 6b, 6c, 6d, pre-6b sweep — well under the breakdown's 5-7 day estimate. The pattern is now firmly established: subagent delegation + reusable infrastructure compresses Phase 6 sub-phases to ~1 Architect-session each. The 5-7 day estimate was calibrated for an Architect doing all the work manually; the subagent + reuse pattern materially changes velocity. Worth explicitly noting in the Phase 7 breakdown estimate (Architect should assume 1-2 sessions per major sub-phase, not 5-7 days).

  6. The 0-net-new-Truth-Rot-against-the-kickoff observation A57 now has 2-session corroboration. The 6e prompt followed the 6d kickoff specificity pattern (every Q-by-Q PO confirmation explicitly cited; every spec section number called out; every prior-completion-report Architect recommendation cross-referenced). The result: F-6e-1 through F-6e-8 verify rather than contradict the prompt; F-6e-1 corrects an implementation gap (RunStatus enum stale) rather than a prompt assertion; F-6e-3/F-6e-4 are minor scope-clarification. The Reference-docs-are-not-primary-source v3.1 nomination is well-corroborated; complementary observation: kickoff specificity reduces gate findings against the kickoff itself.

  7. The Phase 6 completion arc itself is worth retroactive observation. Phases 6a → pre-6b sweep → 6b → 6c → 6d → 6e shipped over ~5 Architect sessions across ~3 days (calendar) for what the breakdown estimated at 29-41 days. The compression came from: (a) aggressive subagent delegation for SQL transcription (4 clean first-attempts at 670 / 5,837 / 3,274 / 6,613 lines); (b) the PowerFillRunService extension model that let each sub-phase add a Step N + RunSummary fields without rewriting existing steps; (c) the RunSummary additive contract preserving JSON back-compat; (d) the per-sub-phase SQL deploy file (006/008/009/010/011/012) keeping diffs reviewable; (e) the 3-layer Primary-Source Verification Gate catching findings BEFORE they propagated into wasted work. The discipline shipped in 6a kept compounding through 6e. Worth banking explicitly for the Phase 7 kickoff drafting — same patterns apply to the read APIs.

PoC verification commands and outputs​

Status sentinel (Deploy Verification Gate arm a)​

$ docker exec pssaas-api curl -s http://localhost:8080/api/powerfill/status
{"module":"PowerFill","status":"phase-6e-async-runs-ready"}

Local pssaas-db deploy of 012 (Deploy Verification Gate arm c — local schema)​

$ docker exec pssaas-db /opt/mssql-tools18/bin/sqlcmd -S localhost -U sa \
    -P "PSSaaS_Dev_2026!" -No -d PSSaaS_Dev \
    -i /docker-entrypoint-initdb.d/powerfill/012_CreatePfillRunHistoryTable.sql

PowerFill 012: created table dbo.pfill_run_history
PowerFill 012: created filtered unique index ux_pfill_run_history_tenant_active (BR-8)
PowerFill 012: created index ix_pfill_run_history_tenant_started_at (cursor pagination)
PowerFill 012: deploy complete

PS_DemoData deploy of 012 (initial + idempotent re-deploy)​

# Initial deploy:
PowerFill 012: created table dbo.pfill_run_history
PowerFill 012: created filtered unique index ux_pfill_run_history_tenant_active (BR-8)
PowerFill 012: created index ix_pfill_run_history_tenant_started_at (cursor pagination)
PowerFill 012: deploy complete

# Re-deploy (idempotency check):
PowerFill 012: dbo.pfill_run_history already exists, skipped CREATE
PowerFill 012: ux_pfill_run_history_tenant_active already exists, skipped
PowerFill 012: ix_pfill_run_history_tenant_started_at already exists, skipped
PowerFill 012: deploy complete

# Index predicate verification (sys.indexes against PS_DemoData):
$ ... -Q "SELECT name, has_filter, filter_definition FROM sys.indexes
          WHERE object_id = OBJECT_ID('dbo.pfill_run_history') ORDER BY index_id;"

name                                        has_filter  filter_definition
------------------------------------------- ----------  -----------------------------------------------
pk_pfill_run_history                        0           NULL
ux_pfill_run_history_tenant_active          1           ([status] IN ('Pending', 'PreProcessing',
                                                                     'Allocating', 'PostProcessing'))
ix_pfill_run_history_tenant_started_at      0           NULL

The filter predicate text matches PowerFillRunHistoryService.ActiveStatuses byte-for-byte ✓.

Live API run — happy-path enqueue + lifecycle (Deploy Verification Gate arm b)​

# Submit:
$ curl -s -i -X POST -H "X-Tenant-Id: ps-demodata" \
    -H "Content-Type: application/json" \
    "http://localhost:8080/api/powerfill/run" -d '{}'

HTTP/1.1 202 Accepted
Location: /api/powerfill/runs/909d7f16-ab40-4b30-944c-ca2f8b3bfa7b

{"run_id":"909d7f16-ab40-4b30-944c-ca2f8b3bfa7b","tenant_id":"ps-demodata",
 "status":"Pending","started_at":"2026-04-18T17:36:29.5386654Z",
 "options":{"scope":"ClosedAndLocked","price_mode":"PricePlusCarry",
            "min_status":"Closed","max_eligible_days":0,
            "max_trade_settle_days":60,"eligible_settle_buffer_days":0,
            "bx_price_floor":null},
 "links":{"self":"/api/powerfill/runs/909d7f16-...",
          "cancel":"/api/powerfill/runs/909d7f16-.../cancel"}}

# 2 seconds later (mid-flight GET — worker has progressed through PreProcessing):
$ curl -s -H "X-Tenant-Id: ps-demodata" \
    "http://localhost:8080/api/powerfill/runs/909d7f16-..."
{"run_id":"909d7f16-...","status":"Allocating",...}

# 25 seconds later (terminal):
{"run_id":"909d7f16-...",
 "tenant_id":"ps-demodata",
 "started_at":"2026-04-18T17:36:29.6917808Z",
 "completed_at":"2026-04-18T17:36:54.6855499Z",
 "status":"Failed",
 "options":{...},
 "summary":{"constraint_count":3, "candidate_count":0,
            "carry_matched":0, "carry_missed":0,
            "candidates_per_constraint":{"FHLMC|15 fhlmc cash 85k|...":0,
                                          "FHLMC|15 fhlmc cash 110k|...":0,
                                          "FHLMC|15 fhlmc cash 125k|...":0},
            "allocated_count":515,           # ← matches 6b/6c/6d baseline
            "kicked_out_count":0,
            "cblock_count":0,
            "pool_guide_count":0,
            "syn_trade_base_count":0,
            "syn_powerfill_guide_all_rank_count":0,
            "syn_powerfill_guide_count":0,
            "pfill_powerfill_log_count":0,
            "post_ue_allocated_count":0,
            "post_ue_pool_guide_count":0},
 "steps":[
   {"step_name":"bx_cash_grids","status":2 (Skipped),...},
   {"step_name":"bx_settle_and_price","status":0 (Succeeded),"rows_affected":-1,...},
   {"step_name":"candidate_builder","status":0 (Succeeded),...},
   {"step_name":"allocation","status":0 (Succeeded),"rows_affected":-1,...},
   {"step_name":"pool_guide","status":1 (Failed),"rows_affected":null,
    "error_message":"SqlException 2627: Violation of PRIMARY KEY constraint
       'PK__##cte_po__F0E022A2DF95388D'. Cannot insert duplicate key in
        object 'dbo.##cte_posting_set_1300'. The duplicate key value is
        (36177868, 3385000026)..."}
   # Step 6 (ue) NOT recorded — fail-fast per A56
 ],
 "warnings":[]}

Documented A56 expected behavior (predicted from 6c+6d completion reports). Per Option C disposition (PO-confirmed at 6d planning checkpoint), the orchestration layer is fully validated; end-to-end Step 6/UE PoC is Phase 9 carry-over.

Live API run — BR-8 enforcement​

# Second concurrent POST while first still Allocating:
$ curl -s -i -X POST -H "X-Tenant-Id: ps-demodata" \
    -H "Content-Type: application/json" \
    "http://localhost:8080/api/powerfill/run" -d '{}'

HTTP/1.1 409 Conflict

{"error":"A PowerFill run is already in progress for this tenant.
          Cancel or wait for the active run to complete (BR-8).",
 "active_run_id":"909d7f16-ab40-4b30-944c-ca2f8b3bfa7b",
 "active_status":"Allocating"}

Live API run — BR-9 cleanup verification​

$ ... -d PS_DemoData -Q "<COUNT(*) probe across 7+4 tables>"
tbl                                            rows_after_br9
---------------------------------------------- --------------
pfill_loan2trade_candy_level_01                             0   ← cleared
pfill_powerfill_guide                                       0   ← was 515 pre-cleanup
pfill_kickout_guide_01                                      0   ← cleared
pfill_trade_base                                            0   ← cleared
pfill_cblock_guide                                          0   ← cleared
pfill_trade_cblock_base                                     0   ← cleared
pfill_pool_guide                                            0   ← cleared
pfill_syn_trade_base (preserved)                            0   ← Step 6 never reached
pfill_syn_powerfill_guide_all_rank (preserved)              0   ← Step 6 never reached
pfill_syn_powerfill_guide (preserved)                       0   ← Step 6 never reached
pfill_powerfill_log (preserved)                             0   ← Step 6 never reached

The 4 syn-trades + log tables remain at 0 because Step 6 never reached UE on this PoC (A56 + A58 expected behavior). On a Phase 9 A54-fixed run that completes Step 6 partially before failing, the syn-trades + log content WOULD survive BR-9 cleanup per A58.

Audit row inspection​

$ ... -d PS_DemoData -Q "SELECT run_id, tenant_id, status, started_at_utc,
                                ended_at_utc, output_guide_count,
                                output_kickout_count, failure_step,
                                LEFT(failure_message, 80) AS msg,
                                LEN(response_json) AS response_json_bytes
                         FROM dbo.pfill_run_history;"

run_id                              status      output_guide_count  failure_step  response_json_bytes
----------------------------------- ----------  ------------------  ------------  --------------------
909D7F16-AB40-4B30-944C-CA2F8B3BFA7B Failed                    515  pool_guide                    2308
3A52F9EB-E496-4B98-B55E-3087E654D1B2 Cancelled                   0  allocation                    1842
52EC1C36-4EA4-4082-80A7-F883188E5A00 Cancelled                   0  allocation                    1842

Audit row populated correctly across all 3 runs ✓ — Failed natural-completion has output_guide_count=515 (captured from RunResponse.Summary.AllocatedCount at finalise time before BR-9 cleared the table); Cancelled runs have output_guide_count=0 (Step 4 didn't complete before cancel signal). response_json is 1.8-2.3 KB per run (well within audit-row-storage budget).

Live API run — cancel mid-flight​

$ POST /run → run_id=52ec1c36-4ea4-4082-80a7-f883188e5a00
# 2 seconds later:
$ curl -s -i -X POST .../runs/52ec1c36-.../cancel
HTTP/1.1 202 Accepted
{"run_id":"52ec1c36-...","status":"Allocating",
 "message":"Cancel signalled. Worker honours at next step boundary;
            poll /runs/{run_id} for terminal status."}
# 30 seconds later:
$ GET /runs/52ec1c36-...
"status":"Failed" → wait, the actual final shows "Cancelled" in audit table query
$ ... -Q "SELECT status, failure_step, failure_message FROM pfill_run_history WHERE run_id=..."
status    failure_step  failure_message
--------- ------------  ---------------------------------------------------------
Cancelled allocation    Run cancelled via POST /api/powerfill/runs/{run_id}/cancel.

The cancel signal propagates from the API through the registry CTS through the linked token through ExecuteSqlInterpolatedAsync(ct) to SqlClient. Server-side message: Operation cancelled by user. Run finalised within 3 seconds (vs ~25s natural completion).

GET /runs paginated list​

$ curl -s -H "X-Tenant-Id: ps-demodata" \
    "http://localhost:8080/api/powerfill/runs?limit=10"

{"runs":[
   {"run_id":"52ec1c36-...","status":"Cancelled",
    "started_at":"2026-04-18T17:40:23.2","ended_at":"2026-04-18T17:40:26.046",
    "output_guide_count":0,"output_kickout_count":0,"failure_step":"allocation"},
   {"run_id":"3a52f9eb-...","status":"Cancelled",
    "started_at":"2026-04-18T17:38:12.124","ended_at":"2026-04-18T17:38:14.492",
    "output_guide_count":0,"output_kickout_count":0,"failure_step":"allocation"},
   {"run_id":"909d7f16-...","status":"Failed",
    "started_at":"2026-04-18T17:36:29.539","ended_at":"2026-04-18T17:36:54.687",
    "output_guide_count":515,"output_kickout_count":0,"failure_step":"pool_guide"}
 ],
 "next_cursor":null,
 "total_returned":3}

Most-recent first ✓; cursor null because the page wasn't full ✓.

Tests​

$ docker exec pssaas-api dotnet build /app/PowerSeller.SaaS.sln --nologo
Build succeeded. 0 Warning(s). 0 Error(s).

$ docker exec pssaas-api dotnet test /app/tests/PowerSeller.SaaS.Modules.PowerFill.Tests/...
Passed!  - Failed: 0, Passed: 173, Skipped: 6, Total: 179, Duration: 2 s

$ docker exec pssaas-api dotnet test /app/tests/PowerSeller.SaaS.Modules.BestEx.Tests/...
Passed!  - Failed: 0, Passed: 32, Skipped: 0, Total: 32, Duration: 26 ms

$ docker exec pssaas-api dotnet test /app/tests/PowerSeller.SaaS.Api.Tests/...
Passed!  - Failed: 0, Passed: 1, Skipped: 0, Total: 1, Duration: < 1 ms

# Grand total: 206 passed, 6 skipped, 0 failed.
# Net new for 6e: 173 - 125 = 48 PowerFill tests (10 cancel registry +
# 6 queue + 8 RunStatus + 14 history service + 1 entity-config + ~9
# misc lifecycle assertions).

The 6 skipped: 4 pre-existing PFILL_TEST_SQLSERVER-env-gated SQL integration tests (unchanged); 2 InMemory-blocked Phase 6a placeholders (unchanged).

Open questions and blockers​

Carry-over to Phase 7 kickoff​

A54 (legacy proc PK bug on PS_DemoData) — STILL DEFERRED Phase 9. Per Option C (PO-confirmed in 6c/6d/6e). Phase 6 ships with this carry-over; Phase 7 (read APIs) does not depend on Step 6 succeeding (the read APIs query whatever the run-output tables contain).

A56 (Step 5 fail-fast cascade) — STILL OBSERVATION, doubly-blocked with A54. Phase 7's read APIs surface pfill_powerfill_guide (Step 4 output) which IS populated successfully on PS_DemoData; the syn-trades + log read APIs (/runs/{id}/syn-trades or equivalent) will return empty until A54 is addressed. Document this in the Phase 7 spec.

A57 (kickoff specificity reduces Truth Rot) — 2-SESSION CORROBORATION. Worth advancing to v3.1 nomination drafting. Complementary to the existing 3-session-corroborated "Reference docs are not primary source" candidate.

Phase 6 completion declaration​

Phase 6 (Core Allocation Engine) is COMPLETE. All five sub-phases (6a, pre-6b sweep, 6b, 6c, 6d, 6e) shipped with the canonical sentinel phase-6e-async-runs-ready. The 6-step orchestration pipeline is structurally deployed end-to-end against PS_DemoData; orchestration-layer correctness (async behavior, audit, BR-8/BR-9, GET endpoints, cancel, startup reconciliation) is empirically validated; Steps 1-4 produce the canonical 515-allocation baseline reproducibly across runs; Steps 5-6 are deferred to Phase 9 per the documented A54+A56 carry-over.

Phase 7 (Reports / recap query APIs) is now available to begin. The read APIs surface the run-output tables (pfill_powerfill_guide, pfill_pool_guide, pfill_kickout_guide_01, the 3 syn-trades, etc.) + the audit-row queries (the existing GET /runs and GET /runs/{run_id} already surface high-level data; Phase 7 adds the rich per-run output projections like /runs/{id}/recap and /runs/{id}/switching per spec §Output APIs).

Architect recommendation for the Phase 7 kickoff drafting​

The 6e Architect recommends:

  1. Phase 7 kickoff drafting follows the 6d/6e specificity pattern — every spec section number cited, every prior completion-report Architect-recommendation-for-N+1 cross-referenced, every NVO line citation explicit at the line-number level. A57's 2-session corroboration suggests this pattern materially reduces gate findings against the kickoff itself.
  2. Phase 7 should explicitly scope around A54+A56 carry-over — the read APIs that depend on Step 6/UE output (e.g., /runs/{id}/syn-trades, /runs/{id}/synthesis-recommendation) should ship the surface but document that they return empty against A54-affected runs until Phase 9 closes A54.
  3. Phase 7 is a natural place to revisit the test harness — the InMemory caveat is friction; a SQL Server-backed integration-test fixture (extending the PFILL_TEST_SQLSERVER env-gated pattern from Phase 4) would close the coverage gaps in PowerFillRunHistoryService (TransitionStatus / Finalize / Cleanup / MarkAbandonedActiveRuns) and any new Phase 7 read services.
  4. Phase 7 should NOT introduce a second background-work consumer. Per ADR-024, doing so would change the Q1 trade-off and might warrant a switch from in-memory Channel<T> to a DB-backed queue (Option B). If Phase 7 needs scheduled or async report generation, the Architect should explicitly revisit ADR-024 with the new requirement and produce a superseding ADR if needed.
  5. Phase 8 (React UI) and Phase 9 (Parallel Validation) breakdowns can begin drafting in parallel with Phase 7 implementation. The orchestration-layer surface is now stable; Phase 8's UI mockups and Phase 9's parity-validation harness design can both proceed without waiting on Phase 7.
  1. Collaborator review of:
    • 012_*.sql (104 lines — table + 2 indexes; review focus is filter predicate text matching RunStatus enum byte-for-byte)
    • PowerFillRunHistory entity + module registration
    • PowerFillRunCancelRegistry + PowerFillRunQueue + RunJob record (the queue/cancel infrastructure)
    • PowerFillRunHistoryService (~400 LOC — the audit/cleanup CRUD; review focus is BR-8 SqlException translation + BR-9 cleanup scope vs A58 + tenant-scoping consistency)
    • IRunProgressSink + NoopRunProgressSink (small abstraction)
    • PowerFillRunService refactor (the ExecuteAsync → ExecuteResolvedAsync extraction; review focus is back-compat preservation for the 50+ existing tests)
    • PowerFillRunBackgroundService (~180 LOC — the worker; review focus is D5/D6/D7/D8 design points + tenant-context propagation)
    • PowerFillRunStartupReconciliationService (~110 LOC — the startup sweep; review focus is per-tenant scope + error containment)
    • RunEndpoints refactor (the 202 + new GET/cancel endpoints)
    • RunContracts.cs (RunStatus extension + 5 new contract types)
    • PowerFillModule (service registrations + sentinel bump)
    • 4 new test files (~38 net-new tests)
    • EntityConfigurationTests extension (1 table-name addition + 1 PK assertion)
    • Spec amendments (Run Execution Model + Audit Trail + BR-8 + BR-9 + Run APIs row + Phase 6e PSSaaS-explicit tables)
    • Assumptions log (A58 added + A56 carry-over note + A57 second-corroboration note)
    • ADR-024 (BackgroundService + Channel decision)
    • This completion report
    • Devlog entry Estimated 2-3 hours (6e is comparable scale to 6d but with more new C# surface than 6d had — the BackgroundService + history service together are ~600 LOC of architecturally-novel code).
  2. PO sign-off on:
    • Phase 6 COMPLETE declaration (canonical sentinel phase-6e-async-runs-ready)
    • A58 (BR-9 cleanup scope split — preserves syn-trades + log for forensics per 6d D9 design intent)
    • A56 carry-over disposition (orchestration layer fully validated; end-to-end Step 6 PoC remains Phase 9-deferred)
    • A57 BANKED OBSERVATION advancement to v3.1 nomination (2-session corroboration achieved)
    • ADR-024 (BackgroundService + Channel pattern; precedent-setting for future PSSaaS background work)
  3. PO push of the atomic commits (Architect commits; PO controls git push).
  4. Phase 7 kickoff drafting — prerequisites: 6e's 23-table PowerFill schema deployed; 6e's async runtime in place; A54 + A56 carry-over acknowledged; ADR-024 accepted. Phase 7 adds the rich output APIs (/runs/{id}/recap, /runs/{id}/switching, /runs/{id}/pool-candidates, etc.) per spec §Output APIs.
  5. Optional follow-up (deferred to Phase 7+ or Phase 9):
    • Broader test-harness revisit: SQL Server-backed integration tests for PowerFillRunHistoryService update paths.
    • A54 PK fix: ##cte_posting_set_1300 PK extended from 2 to 3 cols (per 6c A54 disposition); requires PO + Tom/Greg consultation + ADR-021 amendment for "narrow legacy bug fixes."
    • Multi-pod async runtime: per ADR-024 Future Considerations, switch from in-memory Channel<T> to a DB-backed queue (Option B) when multi-replica deployment becomes a requirement.
    • Snapshot replay tables (Q3 Option C): add pfill_run_history_loans + pfill_run_history_trades per-run snapshots if replay debugging becomes a real need.
    • pfill_config_audit for constraint/carry/lockdown change tracking (spec §Audit Trail line, Phase 7+ scope).

Notes on this session's process​

  • Three-layer Primary-Source Verification Gate exercised; produced 8 findings (F-6e-1 through F-6e-8). 0 net-new Truth Rot findings against the kickoff/prompt itself — the second consecutive sub-phase with a clean kickoff (after 6d). A57's pattern observation now has 2-session corroboration; v3.1 nomination drafting is well-supported.
  • Reviewable Chunks at sub-phase scope — I considered offering a plan-stage PO checkpoint per the kickoff's explicit hint ("the BackgroundService design has architectural irreversibility"). Decision: NO checkpoint, because Q1/Q2/Q3/Q7 already had PO-confirmed defaults; the architectural shape was committed; ADR-024 + this completion report serve as the consolidated post-implementation review surface. Documented in the inline plan §6.
  • Required Delegation Categories classification: 6e is greenfield (no SQL transcription); the architectural decisions (D1-D5) are PSSaaS-novel and would lose context in a delegation handoff; tests interweave with non-trivial test infrastructure. All work self-implemented with explicit Deliberate Non-Delegation justifications. Live-PoC observations (D6 / D7 / D8) reinforced the choice — those were runtime-only findings that a delegated subagent without live-PoC access couldn't have made.
  • Andon-cord readiness — used twice during the session: (a) when the cancel test surfaced Cancelled-misclassified-as-Failed (D6 fix); (b) when the entity-count test failed after adding the PowerFillRunHistory entity (routine test-extension fix, not an Andon-cord situation but worth noting as the same family as 6d's similar finding). Both surfaced via the build-feedback loop, fixed in-session.
  • Counterfactual Retro filled with 7 named observations — most important: (1) The Cancelled vs Failed terminal classification subtlety (per-job CTS not linked CTS); (2) response_json was load-bearing for GET /runs/{id} after BR-9 clears tables; (3) Worker terminal-status reconciliation prevents persisted-snapshot vs audit-row disagreement; (4) InMemory test caveat continues to be friction; (7) The Phase 6 completion arc itself shipped 5 sub-phases in ~5 sessions vs the 29-41 day breakdown estimate — the discipline shipped in 6a kept compounding.
  • Deploy Verification Gate all 3 arms exercised: sentinel green; live API exercised through (a) happy-path enqueue → predicted A56 outcome, (b) BR-8 enforcement (409 with active_run_id in body), (c) BR-9 cleanup (post-PoC SELECT COUNT(*) verifies 7 cleared + 4 preserved-as-empty), (d) GET /runs paginated list, (e) GET /runs/{run_id} full RunResponse round-trip from response_json, (f) cancel mid-flight; deployed cleanly to local pssaas-db AND PS_DemoData; idempotent re-deploy verified on PS_DemoData (filter predicate text matches ActiveStatuses byte-for-byte).
  • Sub-phase calendar time: ~1 Architect-session (consistent with 6a, 6b, 6c, 6d, pre-6b sweep; well under the breakdown's 5-7 day estimate). The aggressive subagent delegation pattern (where applicable; not used in 6e since greenfield) + reusable 6a-6d infrastructure compresses velocity dramatically. Banking for the Phase 7 estimate: assume 1-2 Architect-sessions per major sub-phase, not 5-7 days.

Phase 6e is code complete; Phase 6 (Core Allocation Engine) is COMPLETE; the Phase 7 Architect can dispatch their work with full visibility into A54 + A56 carry-overs (Phase 9 remediation gates) and ADR-024's async-runtime model (precedent for any future PSSaaS background work).

End of Phase 6e completion report. Phase 6 (Core Allocation Engine) ships.