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docs(decisions): add ADR-0018 — environment configuration strategy (#80)
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## Summary

Records the per-environment config strategy for both apps. ADR-only — no code changes; the implementation is anchored in §Confirmation against the next feature work that touches per-environment values.

## What lands

[**ADR-0018 — Environment configuration**](docs/decisions/0018-environment-configuration-strategy.md):

- **SPA**: Angular `environment.ts` + project.json `fileReplacements`. Build-time substitution; no runtime config fetch (rejected for the LCP/TTFB cost it would add and the deploy-time HTML rewrite that the alternatives need). Concretely cleans up the hard-coded URLs we left in `observability/tracing.ts` and `home-status.service.ts` ("hard-coded for v1 — env-config when it lands" comments).
- **BFF**: keep `process.env` + small per-key boot-time validators (the shape `apps/portal-bff/src/config/check-database-url.ts` already follows). `@nestjs/config` rejected as too heavy for the current key count; `zod` not justified yet.
- **Audit log connection**: formalises the `AUDIT_DATABASE_URL` split that ADR-0013 §"Wired as features land" already pointed at. When set, the `AuditModule` instantiates a second Prisma client with `audit_writer`-only credentials (defense in depth); when unset, the dev fallback (shared pool + `SET LOCAL ROLE audit_writer` per transaction) keeps working. A boot-time `UPDATE`-rejection self-test runs against the dedicated pool when configured — refuses to start if the pool can mutate the audit table.

The §Confirmation block cross-references the env-var-as-boot-gate items already pre-figured in ADR-0009 / ADR-0010 / ADR-0012 / ADR-0013 / ADR-0014, so the validator pattern is the single landing place when those features ship.

## What does NOT change in this PR

- No `apps/portal-shell/src/environments/*.ts` files yet — landed alongside the next feature that actually needs per-environment values.
- No `AUDIT_DATABASE_URL` validator in BFF — same; lands when the second pool is wired.
- No CLAUDE.md restructuring; just one extra bullet under the Architecture summary referencing ADR-0018.

## Doc updates

- `docs/decisions/README.md` index — new row for ADR-0018.
- `CLAUDE.md` Architecture summary — one-line reference to ADR-0018 between the perf-budget and local-quality-gates entries.

## Test plan

- [ ] CI green on this PR (`format:check`).
- [ ] ADR-0018 renders in the doc index with the right tags (`frontend`, `backend`, `infrastructure`, `process`) and 2026-05-10 date.

---------

Co-authored-by: Julien Gautier <julien.gautier@apf.asso.fr>
Reviewed-on: #80
This commit was merged in pull request #80.
This commit is contained in:
Julien Gautier
2026-05-10 04:58:02 +02:00
parent 4473b1d4a4
commit 4476cbb518
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@@ -42,22 +42,23 @@ The vocabulary below is the source of truth. It is intentionally coarse — prop
ADRs are listed in numerical order. To slice by topic, filter on the `Tags` column.
| # | Title | Status | Tags | Date |
| ------------------------------------------------------------ | --------------------------------------------------------------------------------------------------------------- | -------- | ----------------------------------------------- | ---------- |
| [0001](0001-use-adrs-to-record-architectural-decisions.md) | Use ADRs to record architectural decisions | accepted | `process` | 2026-04-29 |
| [0002](0002-adopt-nx-monorepo-apps-preset.md) | Adopt Nx monorepo with the `apps` preset | accepted | `infrastructure`, `frontend`, `backend` | 2026-04-29 |
| [0003](0003-workspace-and-app-naming-convention.md) | Workspace and app naming convention | accepted | `process` | 2026-04-29 |
| [0004](0004-frontend-stack-angular-csr-zoneless-signals.md) | Frontend stack — Angular (latest LTS), standalone, zoneless, Signals, CSR-only, Vitest | accepted | `frontend` | 2026-04-29 |
| [0005](0005-backend-stack-nestjs.md) | Backend stack — NestJS over Express, Fastify, Hono | accepted | `backend` | 2026-04-29 |
| [0006](0006-persistence-postgresql-prisma.md) | Persistence — PostgreSQL with Prisma | accepted | `data`, `backend` | 2026-04-29 |
| [0007](0007-pre-commit-hooks-and-conventional-commits.md) | Pre-commit hooks and Conventional Commits | accepted | `process` | 2026-04-29 |
| [0008](0008-identity-model-entra-workforce-dual-audience.md) | Identity model — multi-tenant Entra ID for workforce, dual-audience design for future External ID | accepted | `security`, `data` | 2026-04-29 |
| [0009](0009-auth-flow-oidc-pkce-msal-node.md) | Authentication flow — OIDC Authorization Code + PKCE via MSAL Node, BFF session pattern | accepted | `security`, `backend` | 2026-04-29 |
| [0010](0010-session-management-redis.md) | Session management — opaque session IDs in cookies, payload in self-hosted Redis with AES-GCM at rest | accepted | `security`, `backend`, `infrastructure` | 2026-04-29 |
| [0011](0011-mfa-enforcement-entra-conditional-access.md) | MFA enforcement — Entra ID Conditional Access baseline, BFF claim sanity-check, step-up hooks designed-in | accepted | `security` | 2026-04-29 |
| [0012](0012-observability-pino-opentelemetry.md) | Observability — Pino structured logs + OpenTelemetry tracing, W3C Trace Context propagation, stdout + collector | accepted | `observability`, `backend`, `frontend` | 2026-04-29 |
| [0013](0013-audit-trail-separated-postgres-append-only.md) | Audit trail — separated append-only Postgres schema, decoupled from app logs | accepted | `security`, `observability`, `data` | 2026-04-29 |
| [0014](0014-downstream-api-access-obo-pattern.md) | Downstream API access — On-Behalf-Of pattern, unified `DownstreamApiClient`, audience-aware authorization | accepted | `security`, `backend` | 2026-04-29 |
| [0015](0015-cicd-gitea-actions.md) | CI/CD pipeline — Gitea Actions, trunk-based + squash-merge, thin YAML over portable scripts | accepted | `infrastructure`, `process` | 2026-04-30 |
| [0016](0016-accessibility-baseline-wcag-aa-targeted-aaa.md) | Accessibility baseline — WCAG 2.2 AA + targeted AAA, Angular CDK + spartan-ng + Tailwind, APF panel testing | accepted | `accessibility`, `frontend`, `process` | 2026-04-30 |
| [0017](0017-performance-budgets-lighthouse-ci.md) | Performance budgets — Core Web Vitals + Lighthouse CI gates, bundle budgets, BFF p95/p99 SLOs | accepted | `performance`, `frontend`, `backend`, `process` | 2026-04-30 |
| # | Title | Status | Tags | Date |
| ------------------------------------------------------------ | --------------------------------------------------------------------------------------------------------------- | -------- | -------------------------------------------------- | ---------- |
| [0001](0001-use-adrs-to-record-architectural-decisions.md) | Use ADRs to record architectural decisions | accepted | `process` | 2026-04-29 |
| [0002](0002-adopt-nx-monorepo-apps-preset.md) | Adopt Nx monorepo with the `apps` preset | accepted | `infrastructure`, `frontend`, `backend` | 2026-04-29 |
| [0003](0003-workspace-and-app-naming-convention.md) | Workspace and app naming convention | accepted | `process` | 2026-04-29 |
| [0004](0004-frontend-stack-angular-csr-zoneless-signals.md) | Frontend stack — Angular (latest LTS), standalone, zoneless, Signals, CSR-only, Vitest | accepted | `frontend` | 2026-04-29 |
| [0005](0005-backend-stack-nestjs.md) | Backend stack — NestJS over Express, Fastify, Hono | accepted | `backend` | 2026-04-29 |
| [0006](0006-persistence-postgresql-prisma.md) | Persistence — PostgreSQL with Prisma | accepted | `data`, `backend` | 2026-04-29 |
| [0007](0007-pre-commit-hooks-and-conventional-commits.md) | Pre-commit hooks and Conventional Commits | accepted | `process` | 2026-04-29 |
| [0008](0008-identity-model-entra-workforce-dual-audience.md) | Identity model — multi-tenant Entra ID for workforce, dual-audience design for future External ID | accepted | `security`, `data` | 2026-04-29 |
| [0009](0009-auth-flow-oidc-pkce-msal-node.md) | Authentication flow — OIDC Authorization Code + PKCE via MSAL Node, BFF session pattern | accepted | `security`, `backend` | 2026-04-29 |
| [0010](0010-session-management-redis.md) | Session management — opaque session IDs in cookies, payload in self-hosted Redis with AES-GCM at rest | accepted | `security`, `backend`, `infrastructure` | 2026-04-29 |
| [0011](0011-mfa-enforcement-entra-conditional-access.md) | MFA enforcement — Entra ID Conditional Access baseline, BFF claim sanity-check, step-up hooks designed-in | accepted | `security` | 2026-04-29 |
| [0012](0012-observability-pino-opentelemetry.md) | Observability — Pino structured logs + OpenTelemetry tracing, W3C Trace Context propagation, stdout + collector | accepted | `observability`, `backend`, `frontend` | 2026-04-29 |
| [0013](0013-audit-trail-separated-postgres-append-only.md) | Audit trail — separated append-only Postgres schema, decoupled from app logs | accepted | `security`, `observability`, `data` | 2026-04-29 |
| [0014](0014-downstream-api-access-obo-pattern.md) | Downstream API access — On-Behalf-Of pattern, unified `DownstreamApiClient`, audience-aware authorization | accepted | `security`, `backend` | 2026-04-29 |
| [0015](0015-cicd-gitea-actions.md) | CI/CD pipeline — Gitea Actions, trunk-based + squash-merge, thin YAML over portable scripts | accepted | `infrastructure`, `process` | 2026-04-30 |
| [0016](0016-accessibility-baseline-wcag-aa-targeted-aaa.md) | Accessibility baseline — WCAG 2.2 AA + targeted AAA, Angular CDK + spartan-ng + Tailwind, APF panel testing | accepted | `accessibility`, `frontend`, `process` | 2026-04-30 |
| [0017](0017-performance-budgets-lighthouse-ci.md) | Performance budgets — Core Web Vitals + Lighthouse CI gates, bundle budgets, BFF p95/p99 SLOs | accepted | `performance`, `frontend`, `backend`, `process` | 2026-04-30 |
| [0018](0018-environment-configuration-strategy.md) | Environment configuration — Angular `environment.ts`, BFF env vars, audit pool split | accepted | `frontend`, `backend`, `infrastructure`, `process` | 2026-05-10 |