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PowerFill Phase 7 — Reports / Recap Query APIs

Date: 2026-04-19 Agent: PSSaaS Systems Architect (Opus 4.7 High Thinking) Scope: Ship 8 GET endpoints over the pfill_* run-output tables (the 7 canonical PowerFill reports per spec line 62 — Guide, Recap, Switching, Pool Candidates, Existing Disposition, Pooling Guide, Cash Trade Slotting — plus the Kickouts surface per spec line 363, F-7-2). Architecturally novel pattern: latest-Complete-wins semantics for the {run_id} URL parameter; cursor pagination on natural composite PKs; per-report Note conventions for freshness verdicts + per-report semantic clarifications.

Why​

Phase 7 is the first phase after the Phase 6 (Core Allocation Engine) completion arc. The PowerFill spec (§Output APIs at lines 354-363) requires read endpoints over the run-output tables; Phase 8 (React UI + Superset dashboards) needs a stable JSON contract to consume. Phase 7 delivers that contract.

The PSSaaS-novel architectural decisions (per-run vs current-state semantics; umbrella service vs per-report repositories; cursor pagination format) needed an explicit ADR (ADR-025) because Phase 8+ may add additional report endpoints (risk reports, BestEx reports, etc.) and the pattern set here is precedent.

What Was Done​

Code (no SQL — Phase 7 is read-only over existing 23-table schema + Phase 2's existing view + 1 new upstream entity)​

  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Contracts/ReportContracts.cs (NEW; 456 lines, 19 types) — 8 row records + 3 cursor records + 8 response wrappers; snake_case [JsonPropertyName] on every field; reuses existing RunStatus enum. Generated by Subagent 1, clean first-attempt.
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Services/PowerFillReportService.cs (NEW; ~600 LOC) — umbrella service per ADR-025 §A7.2 Option A. 8 public methods (one per report) + private ResolveRunContextAsync helper that drives the freshness verdict (Current / RunNotFound / Stale / TerminalEmpty per A60). Self-implemented (architecturally novel; precedent-setting).
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Domain/Upstream/PscatTradeCashGrid.cs (NEW) — PowerFill-owned upstream read projection over pscat_trade_cash_grid (per A61 / F-7-5). Composite PK (trade_id, rate, syntax_name) matches infra/sql/init/seed-schema.sql. Type-safe over the legacy table; not actually JOINed by Phase 7 service yet (PS_DemoData runs skip Step 1 per A12).
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Endpoints/RunEndpoints.cs (extended) — 8 new GET endpoints + private BuildReportResult<T>(Guid, T?) helper for HTTP routing (404 on null; 410 Gone when Note carries Stale prefix per D8; 200 OK otherwise).
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Domain/Upstream/UpstreamEntityConfiguration.cs (extended) — added PscatTradeCashGridConfiguration (composite PK).
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/PowerFillModule.cs (extended) — registered PowerFillReportService (scoped) + PscatTradeCashGrid entity; sentinel bumped to phase-7-reports-ready.

Tests (27 net-new for Phase 7)​

  • src/backend/tests/PowerSeller.SaaS.Modules.PowerFill.Tests/Services/PowerFillReportServiceTests.cs (NEW; ~700 LOC, 27 tests) — generated by Subagent 2. 7 freshness verdict tests + 10 per-report happy-path tests + 5 pagination tests + 3 edge-case tests + 2 tenant-scoping tests. All 27 pass against InMemory.

Test totals: 173 → 200 PowerFill (+27 net-new). 32 BestEx + 1 Api unchanged. Grand total: 233 passed, 6 skipped, 0 failed.

Documentation​

  • docs-site/docs/adr/adr-025-powerfill-report-api-pattern.md (NEW) — full ADR documenting A7.1 / A7.2 / A7.3 decisions (latest-Complete-wins; umbrella service; keyset cursor on natural composite PK). Precedent-setting for Phase 8+ report endpoints.
  • docs-site/docs/specs/powerfill-engine.md (amended) — §Output APIs promoted from placeholder to canonical contract specs with response shapes + freshness-verdict table + per-endpoint PoC behavior table; two §Post-Allocation checklist items marked Phase 7 done; Phased Implementation table marks Phase 7 DONE with calendar-time observation.
  • docs-site/docs/specs/powerfill-assumptions-log.md (amended) — A59 (kickoff specificity mis-cite per F-7-1), A60 (latest-Complete-wins semantics per A7.1), A61 (PscatTradeCashGrid PSSaaS EF entity per F-7-5), A62 (PS_DemoData view drift per F-7-7).
  • docs-site/docs/arc42/09-architecture-decisions.md (amended) — ADR-025 row added.
  • docs-site/docs/handoffs/powerfill-phase-7-completion.md (NEW) — completion report (~600 lines) with PoC verification per endpoint + 8 Gate findings + 10 decisions table + Counterfactual retro + recommended next steps.
  • This devlog entry.

Files Produced / Modified​

New:

  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Contracts/ReportContracts.cs
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Services/PowerFillReportService.cs
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Domain/Upstream/PscatTradeCashGrid.cs
  • src/backend/tests/PowerSeller.SaaS.Modules.PowerFill.Tests/Services/PowerFillReportServiceTests.cs
  • docs-site/docs/adr/adr-025-powerfill-report-api-pattern.md
  • docs-site/docs/handoffs/powerfill-phase-7-completion.md
  • docs-site/docs/devlog/2026-04-19d-powerfill-phase-7.md (this file)

Modified:

  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Endpoints/RunEndpoints.cs (8 new GET endpoints + BuildReportResult helper)
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/Domain/Upstream/UpstreamEntityConfiguration.cs (PscatTradeCashGrid composite-key config)
  • src/backend/PowerSeller.SaaS.Modules.PowerFill/PowerFillModule.cs (service + entity registration; sentinel bump)
  • docs-site/docs/specs/powerfill-engine.md (major §Output APIs amendment + Phased Implementation table update)
  • docs-site/docs/specs/powerfill-assumptions-log.md (A59-A62 added in canonical house style)
  • docs-site/docs/arc42/09-architecture-decisions.md (ADR-025 row added)

Key Decisions​

#DecisionReference
D1Single PowerFillReportService umbrella service per ADR-025 §A7.2 Option AADR-025
D2Latest-Complete-wins semantics for {run_id} URL parameter (ADR-025 §A7.1 Option B / A60)ADR-025; A60
D38th endpoint added: Kickouts (per F-7-2 disposition; spec line 363 enumerates it)F-7-2
D4Cursor pagination via keyset on natural composite PK (ADR-025 §A7.3 Option A)ADR-025
D6Note field convention: dual-source semicolon-delimited explanationsservice per-report Note logic
D7SqlException 207/208 catch-and-degrade in GetExistingDispositionAsync per F-7-7 / A62A62
D8Cancel-vs-Stale prefix detection in BuildReportResult helper for HTTP 410 routingRunEndpoints.cs

Full decision details + rationale in the completion report §Decisions made.

What's Next​

Phase 7 (Reports / Recap Query APIs) is COMPLETE. Sentinel phase-7-reports-ready. 8 GET endpoints surface the run-output tables; latest-Complete-wins semantics enforce a clean contract; PoC against PS_DemoData empirically validates all 4 freshness verdicts (404 / 410 / 200+TerminalEmpty / 200+Current); F-7-8 demonstrates that A58's preservation scope is observable from the read APIs (Cash Trade Slotting returns 688 real rows on a Failed run because cash_market_map is not BR-9-cleared).

Phase 8 (React UI + Superset dashboards) is now available. The Phase 7 endpoint contract + ADR-025's per-run semantics give Phase 8 a stable surface. The Note field is the load-bearing UX signal for freshness-aware UIs.

Phase 9 (Parallel validation) can begin in parallel with Phase 8 implementation. F-7-8 is the canonical "non-BR-9-cleared sources are validation paths even on Failed runs" pattern — Phase 9 harness should structure validation around it.

Risks Captured​

  • A54 (legacy proc PK violation on PS_DemoData snapshot) — STILL DEFERRED Phase 9. Phase 7's read APIs that depend on Step 5/6 output return empty + Note explaining the block.
  • A56 (Step 5 fail-fast cascade) — STILL OBSERVATION, doubly-blocked with A54. F-7-8 demonstrates the Phase 7 read APIs surface this correctly (TerminalEmpty + per-report Note).
  • A62 (PS_DemoData view schema drift) — DEFERRED per Backlog #24. Phase 7 service catches SqlException 207/208 and degrades to empty payload + explanatory Note. Phase 9 closes either by deploying 002_*.sql to PS_DemoData OR renaming PSSaaS view to pfillv2_*.
  • InMemory test caveat continues — the 27 new tests cover the InMemory-supported subset of Phase 7 service paths; SqlException-catching paths and some BR-9 cleanup observability paths are not exercised against the SQL Server provider. Phase 9 should add SQL-Server-backed integration coverage.

Process Notes​

  • Sub-phase calendar time: ~1 Architect-session — consistent with 6a-6e velocity. Even at Phase 7's 8-endpoint scale, the subagent dispatch + reusable infrastructure pattern compresses delivery to ~1 session.
  • A57 (kickoff specificity reduces Truth Rot) — corroboration breaks at 3 sessions. A59 documents the F-7-1 mis-cite (kickoff cited NVO 6730-6753 as view definition source; that's the deploy block, the body is at NVO 12485). The pattern observation persists with the qualifier: specificity at the line-number level remains a Gate-quality signal but does not eliminate Truth Rot probability. v3.1 nomination drafting can proceed with this qualifier baked in.
  • Andon-cord used twice: F-7-7 SqlException at PoC time → catch-and-degrade pattern + A62 doc; StaleNoteFormat said "latest Complete run" but latest can be Failed/Cancelled → updated to "latest run" + redirect-via-GET-runs-instruction. Both surfaced in live PoC and fixed in-session.
  • All 3 Deploy Verification Gate arms exercised: sentinel green (phase-7-reports-ready); live API exercised through 8 endpoints + Stale + RunNotFound paths against PS_DemoData; no SQL deploys this phase (read-only over existing schema).
  • Required Delegation Categories — 19 DTOs delegated (Subagent 1; clean first-attempt); 27 tests delegated (Subagent 2; one minor iteration); umbrella service + endpoints + ADR + spec + assumptions + completion report self-implemented per Deliberate Non-Delegation. Mirrors 6e's split: greenfield + tests delegable; design + service + ADR self-implement.
  • Counterfactual Retro filled with 7 observations — most important: (1) F-7-7 was Backlog-discoverable at planning time (Backlog #24 has been open since 2026-04-16 noting the encrypted view; the Backlog table is part of the Three-layer Primary-Source Verification Gate's Implementation-vs-runtime layer); (2) Note dual-source format emerged at PoC time (could've been designed upfront with structured notes[]); (3) F-7-8 Cash Trade Slotting real-data result is the canonical A58-preservation validation pattern for Phase 9 to bank.