[EPAC-2298]: Persist clause-level bill diff data for backend route#814
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## What & why Post-implementation **architecture verification** of the *Bill diff backend completion* Project ([EPAC-2293](https://linear.app/riddimsoftware/issue/EPAC-2293/architecture-verification-for-bill-diff-backend-completion)). This is an `arch-team` Project Verification gate — not a PR review and not an implementation change. It scores the *merged* Project state on `origin/main` and records the result as a checked-in scorecard, mirrored to a Linear comment on EPAC-2293. Docs-only: adds `docs/architecture/bill-diff-backend-completion-verification-epac2293.md`. No application/backend code is touched (the issue's "no implementation PR / no code patching" constraint is preserved). ## Verdict **7.5 / 10.0 — Healthy (high pass).** No Cardinal Sin, no Hidden Dependency. What holds: - Dependency direction holds in both Go services (`domain` imports no use case/adapter/SDK; use cases depend on ports; `main.go` is the composition root). - Serving split is correct: `LoadBillVersionDiff` owns the 204-vs-404 policy, the handler is thin, the repository owns SQLite. - **Civic-content provenance is clean** — verbatim XML→clause text end-to-end, structural `change_type` only, honest `nil` Hansard anchors; no generated/summarized parliamentary text. - Deployment smoke distinguishes API Gateway 404 from app-level 404 — directly targeting the original regression. - OpenAPI + use-case catalog updated by the implementing PRs. Deductions (−2.5): Behavioral Leakage −1.0 + Catalog Drift −1.0 (clause-diff policy lives in the LEGISinfo source adapter, not the cataloged indexer use case) → **EPAC-2303**; Enforcement Gap −0.5 (bills SQLite artifact schema is an unverified cross-adapter contract; sparse served version metadata) → **EPAC-2304**. ## Reconstructed inputs Originally-named siblings EPAC-2283/2284 were re-scoped (still in Backlog). Actual merged work scored: EPAC-2286 (#810), EPAC-2298 (#814), EPAC-2287 (#811), EPAC-2299 (#815), EPAC-2288 (#812), EPAC-2285 (#817), EPAC-2289 (#818), via `git fetch origin main` + merged commits. ## Follow-ups filed (non-blocking, `arch`, est. 4) - [EPAC-2303](https://linear.app/riddimsoftware/issue/EPAC-2303) — Implement `ComputeBillVersionDiff` use case in the bills-indexer application layer. - [EPAC-2304](https://linear.app/riddimsoftware/issue/EPAC-2304) — Lock the bills SQLite artifact schema with a producer-to-consumer seam test. ## Verification evidence - Scope is docs-only (`git diff origin/main..HEAD --stat`: 1 file, +117). No Go/Swift/CI code changed, so no build or simulator run applies; `pr-build` covers the change. - EPAC-2293 attached to the *Bill diff backend completion* Project; scorecard comment posted on the issue. Release-Note: none (docs-only architecture verification record). Co-authored-by: riddim-developer-bot <developer-bot@riddimsoftware.com>
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Scope
Fixes the XML and PDF URL discovery gap in the
bills-indexerfetcher. When processing intermediate bill versions (e.g. "As amended by committee" or "As passed by the House of Commons"), parl.ca's DocumentViewer URLs return 302 redirects to an error page, which prevented the indexer from locating and ingesting the XML text of these intermediate stages.To resolve this, we programmatically construct the XML and PDF URLs for subsequent versions based on the successfully-resolved first-reading document URLs, substituting the version numbers. This ensures all bill versions have their text fetched, enabling the clause-level diff algorithm to run and persist clause diff data in
bill_clause_diffsfor the backend/diffendpoint.Bugfix SPEC
Testing notes
Automated tests run:
go test ./...inbackend/bills-indexer(passed)go test ./...inbackend/bills(passed)python3 -m pytest scripts/ci/test_backend_staging_smoke.py(passed)fetcher_test.gocoveringconstructXMLURLandconstructPDFURLManual verification:
Screenshots
N/A
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