apf_portal/docs/decisions/0026-person-user-portal-data-model.md

---
status: proposed
date: 2026-05-24
decision-makers: R&D Lead
tags: [data, backend, security]
---

# `Person` golden record + `User` portal-account + organisational hierarchy — portal-side data model

## Context and Problem Statement

[ADR-0025](0025-authorization-model-privileges-roles-scopes.md) shipped the authorization model — three orthogonal axes (privileges × functional roles × scopes) — but left several anchors as proposed-follow-up. In v1 those anchors are stubbed:

- `Principal.user.id` and `Principal.user.personId` are populated with the Entra `oid` as a placeholder, because no portal-side identity record exists yet (see [ADR-0025 §"Principal shape"](0025-authorization-model-privileges-roles-scopes.md) and the BFF builder at `apps/portal-bff/src/auth/principal-builder.ts`).
- `ScopeResolver` returns `[{ kind: 'unrestricted' }]` for every signed-in user (see `StubScopeResolver` and [ADR-0025 §"Sources of truth — apf_portal-side `user_scopes` table"](0025-authorization-model-privileges-roles-scopes.md)). The intended per-persona scopes documented in `notes/test-tenant-role-assignments.md` have nowhere to live.
- `@RequireScope`'s `ScopableResource` shape — `etablissementFiness`, `delegationCode`, `regionCode`, `isSiege` — describes a parentage chain the BFF cannot actually fetch because there is no `Etablissement` / `Delegation` / `Region` table.

The portal also needs a representation of **people who are not yet portal users**. APF France handicap touches three populations with very different relationships to the portal:

1. **Workforce** (salariés on payroll) — almost certainly portal users; their identity, employment status, and current assignment come from Pléiades (the HR system).
2. **Governance** (élus du CA national + élus des CD départementaux) — many will be portal users; their identity, mandate type, and mandate scope come from Acteurs+ (the governance system).
3. **Bénévoles + adhérents + bénéficiaires** — most will not be portal users; their identity lands in the portal via the membership / dossier flows.

A naive "User table = anyone who ever signed in" model collapses these three populations into one bucket and loses two important capabilities the portal needs from day one:

- **Pré-provisioning** — an établissement director must be able to assign a scope to a salarié before the salarié first signs in. The salarié needs a portal-side identity that pre-exists their first OIDC callback.
- **Person-without-User** — a dossier is held by a bénéficiaire who may never sign in. The dossier still needs to reference a stable Person identifier; later, if the bénéficiaire signs up to portal-facing services, an account is overlaid on top of the existing Person record.

This ADR specifies the portal-side data model that resolves both the ADR-0025 stubs and these business shapes. It deliberately does **not** specify the upstream sync (Pléiades, Acteurs+, membership / dossier feeds) — that is [ADR-0027](#)'s territory. Likewise, the **facet shapes** (Salarié, Élu, Adhérent, Bénéficiaire) attach to a Person but their fields ride alongside their producing sync, so they land with ADR-0027.

ADR-0026's scope: the three core tables (`Person`, `User`, `UserScope`) plus the geographic / organisational hierarchy (`Region`, `Delegation`, `Etablissement`) that scope checks dereference today.

## Decision Drivers

- **`Principal.user.personId` must point at a real, stable identifier** — guards consuming `self`-scoped resources compare against it, and the AI service uses it (hashed) for audit-log joining per [ADR-0024](0024-ai-service-relay-grpc-sse-bridge.md).
- **Person-without-User** must be a valid state — Pléiades pre-provisioning, dossier beneficiaries, alumni.
- **`Etablissement.finess`, `.delegationCode`, `.regionCode`** must resolve from a real row, not a hardcoded map — the [ADR-0016](0016-accessibility-baseline-wcag-aa-targeted-aaa.md) panel-tested admin UI will list établissements; the BFF guards traverse the chain on scope checks.
- **No premature normalisation of facets.** Salarié / Élu / Adhérent / Bénéficiaire schemas track their upstream system; specifying them before the sync ADR ([ADR-0027](#)) lands invites churn. Mark them as deferred and keep ADR-0026 narrow.
- **Lazy User creation on first sign-in** — the OIDC callback creates the `User` row the first time it sees a new Entra `oid`. This avoids a Pléiades-side dependency before any sign-in works; Pléiades-driven pre-provisioning lands with ADR-0027 and updates the lookup path, not the schema.
- **No PII outside the boundary it belongs in.** `Person.firstName` / `lastName` are PII — they need the same redaction / hashing posture as the audit-log salt ([ADR-0013](0013-audit-trail-separated-postgres-append-only.md)).

## Considered Options

- **Option A — `User`-only, no `Person`.** A single table for "anyone who ever signed in". Dossiers reference `userId` directly. Bénéficiaires who never sign in have no row at all.
- **Option B — `Person` golden record + `User` portal-account overlay (chosen).** Two tables, one-to-zero-or-one relationship. `Person` is the stable identity; `User` is the portal-access overlay that exists when (and only when) someone has portal access.
- **Option C — `Person` lives in Entra (no portal-side row).** Use Entra's user object as the golden record; portal stores only deltas (scopes, etc.).
- **Option D — `Person` + per-relationship junction (Salarié-of-établissement-X, Élu-of-CD-Y, …) embedded directly in `Person`.** Single table with discriminator columns for every facet.

## Decision Outcome

Chosen option: **B — `Person` golden record + `User` portal-account overlay**, because it is the only option that:

1. lets a Person exist before they ever sign in (workforce pre-provisioning, dossier beneficiaries);
2. lets a User row carry portal-only state (`lastSignInAt`, future audit-flagging, future user-preferences in [ADR-0016](0016-accessibility-baseline-wcag-aa-targeted-aaa.md)) without polluting the Person record that Pléiades / Acteurs+ owns;
3. matches the existing intuition in ADR-0025's `Principal.user.{id, personId}` shape: the two ids exist because the two concerns are distinct.

### Schema — core tables

```prisma
model Person {
  id          String   @id @default(uuid())
  // Identity. firstName + lastName are PII; treat per ADR-0013's redact rules.
  firstName   String
  lastName    String
  // Primary contact email. Unique because it serves as the fallback
  // dedup key for Pléiades / Acteurs+ syncs (ADR-0027) — a future
  // sync receiving a Pléiades row with email X looks up Person by
  // email before deciding insert vs update.
  email       String?  @unique
  // Provenance: which upstream owns the row. v1: 'self-signin'
  // (lazy-created at OIDC callback), 'admin-ui' (manually entered
  // by an admin before first sign-in), 'seed' (test-tenant
  // provisioning).
  // ADR-0027 will add 'pleiades' and 'acteurs-plus'. The field is
  // a free-form string in v1; promoting to an enum is an ADR-0027
  // decision once the sync sources are concrete.
  source      String
  // Upstream-system identifier (Pléiades matricule, Acteurs+ id).
  // Nullable because v1 sources do not provide one.
  externalId  String?
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt

  user        User?

  @@index([source])
  @@index([externalId])
}

model User {
  id            String    @id @default(uuid())
  personId      String    @unique
  person        Person    @relation(fields: [personId], references: [id])
  // Entra object id. Stable per-tenant; unique because two
  // separate Person + User pairs cannot share an Entra identity.
  entraOid      String    @unique
  // Entra tenant id. Stored alongside the oid so a future
  // dual-audience activation (ADR-0008) can disambiguate.
  tenantId      String
  // Surfaced in the /admin/users list per ADR-0020. Refreshed by
  // the SessionEstablisher (apps/portal-bff/src/auth/session-establisher.service.ts).
  lastSignInAt  DateTime?
  createdAt     DateTime  @default(now())
  updatedAt     DateTime  @updatedAt

  scopes        UserScope[]

  @@index([entraOid])
}

model UserScope {
  id          String    @id @default(uuid())
  userId      String
  user        User      @relation(fields: [userId], references: [id], onDelete: Cascade)
  // Discriminator — one of the six ADR-0025 scope kinds.
  kind        String
  // Per-kind payload. FINESS for etablissement, dept code for
  // delegation, INSEE region code for region, empty string for
  // self / siege / unrestricted (the unique constraint below
  // tolerates empty strings).
  value       String    @default("")
  // Provenance same posture as Person.source. v1: 'admin-ui' or
  // 'seed'. ADR-0027 adds 'pleiades' / 'acteurs-plus' and the
  // reconciliation rules between admin overrides and upstream
  // data.
  source      String
  createdAt   DateTime  @default(now())
  // When non-null and past, the row is ignored at sign-in.
  // Supports interim-director-for-two-months patterns and admin
  // UI scope revocations.
  expiresAt   DateTime?

  @@unique([userId, kind, value])
  @@index([userId])
}
```

### Schema — organisational hierarchy

```prisma
model Region {
  // INSEE region code (2 digits — '11' for Île-de-France, '75' for
  // Nouvelle-Aquitaine). Stable across reorgs; doubles as the
  // primary key because the codes are short and stable.
  code        String   @id
  name        String
  delegations Delegation[]
}

model Delegation {
  // French department code (2-3 chars — '33', '2A', '971'). Same
  // rationale as Region.code.
  code        String   @id
  name        String
  regionCode  String
  region      Region   @relation(fields: [regionCode], references: [code])
  etablissements Etablissement[]
}

model Etablissement {
  // FINESS code (9 digits — '0330800013'). The legal identifier
  // for medico-social establishments in France; stable across
  // reorgs.
  finess        String   @id
  name          String
  // What this row is: a real établissement vs the siège vs a
  // future placeholder. Drives scope matching: the matcher
  // resolves `principal.scopes` against this column.
  kind          String   // 'etablissement' | 'siege'
  delegationCode String
  delegation    Delegation @relation(fields: [delegationCode], references: [code])

  @@index([delegationCode])
}
```

`Region.code` / `Delegation.code` / `Etablissement.finess` doubling as primary keys is a deliberate choice: they are externally-meaningful identifiers that already exist in every upstream system, they appear in URLs (`/api/etablissements/0330800013`), and they round-trip cleanly through scope literals (`etablissement:0330800013`). Adding a separate UUID would force every consumer to indirect through it for no gain.

### Lifecycle — Person + User creation

**v1 (this ADR's implementation PR):**

```
   ┌──────────────────────────────────────────────────────────┐
   │   First sign-in for Entra oid X                          │
   │                                                          │
   │   1. SessionEstablisher.establish() callback             │
   │   2. PersonAndUserProvisioner.ensureUser({ oid: X, … })  │
   │      a. Look up User by entraOid                         │
   │         → if found: update lastSignInAt, return          │
   │         → if not found: continue                         │
   │      b. Look up Person by email (case-insensitive)       │
   │         → if found: link User to existing Person         │
   │         → if not found: create Person with                │
   │           source='self-signin', then link User           │
   │   3. PrincipalBuilder.build() now sees a real Person     │
   │      and a real User; Principal.user.personId carries    │
   │      Person.id rather than the entraOid placeholder      │
   └──────────────────────────────────────────────────────────┘
```

**ADR-0027 (later):** Pléiades / Acteurs+ syncs create Person rows ahead of any sign-in. The lookup path becomes:

1. by `Person.externalId` if the sign-in carries one (rare — only when the federated identity exposes the upstream id),
2. by `Person.email` (the existing v1 lookup),
3. fallback to creating a `source='self-signin'` Person.

The schema does not change; only the provisioner's lookup order extends.

### Scope resolution — `PrismaScopeResolver`

`StubScopeResolver` in v1 returns `[{ kind: 'unrestricted' }]`. After ADR-0026 lands:

```ts
@Injectable()
export class PrismaScopeResolver extends ScopeResolver {
  constructor(private readonly prisma: PrismaService) {
    super();
  }

  async resolve({ userId }: { userId: string }): Promise<ReadonlyArray<Scope>> {
    const rows = await this.prisma.userScope.findMany({
      where: {
        userId,
        OR: [{ expiresAt: null }, { expiresAt: { gt: new Date() } }],
      },
    });
    return rows.map(toScope);
  }
}
```

The signature `resolve({ userId })` differs from the current `resolve({ entraOid })` — the User UUID is the natural key once the schema exists. The PrincipalBuilder evolves to pass `userId` instead, which is fine because the provisioner above has just created / fetched it.

### `Principal.user` post-implementation

The two placeholders called out at the top of this ADR resolve:

| Field              | Pre-ADR-0026        | Post-ADR-0026                                            |
| ------------------ | ------------------- | -------------------------------------------------------- |
| `user.id`          | Entra `oid`         | `User.id` (portal UUID)                                  |
| `user.personId`    | Entra `oid`         | `Person.id` (portal UUID)                                |
| `user.entraOid`    | Entra `oid`         | unchanged                                                |
| `user.tenantId`    | Entra `tid`         | unchanged                                                |
| `user.displayName` | Entra `displayName` | unchanged (cached at sign-in; admins can override later) |

### What ADR-0026 ships vs what stays for ADR-0027

| Concern                                                                     | ADR-0026 (this)              | ADR-0027 (next)          |
| --------------------------------------------------------------------------- | ---------------------------- | ------------------------ |
| `Person`, `User`, `UserScope` schema                                        | ✅                           | —                        |
| `Region`, `Delegation`, `Etablissement` schema                              | ✅ (manually-seeded in v1)   | Pléiades-sync population |
| `Person.source = 'self-signin'` lazy creation                               | ✅                           | —                        |
| `Person.source = 'pleiades'` / `'acteurs-plus'`                             | as a documented future value | Sync implementation      |
| Salarié / Élu / Adhérent / Bénéficiaire facets                              | deferred                     | ✅                       |
| Reconciliation between admin-UI overrides and Pléiades-driven `user_scopes` | deferred                     | ✅                       |

The facet split was the main "tempting to ship now" item; deferring it keeps the schema migration small enough to land + roll back cleanly if the lazy-provisioner exposes a corner case.

### Consequences

- Good, because `Principal.user.personId` is finally a real, stable identifier — `@RequireScope({ kind: 'self' })` can compare against `Dossier.personId` end-to-end without "the entraOid happens to be the personId" gymnastics.
- Good, because Pléiades and Acteurs+ syncs (ADR-0027) can drop into a known shape; their lookup logic (email-based dedup, externalId carryover) is already part of v1.
- Good, because the admin UI scope-seeding flow (v1 manual entry per ADR-0025 §"Sources of truth — apf_portal-side `user_scopes` table") now has a target row to write against (`UserScope`).
- Bad, because `Person.email` as the v1 dedup key is fragile — two Pléiades records with the same email crash the unique constraint. Mitigation: ADR-0027 adds `externalId` precedence and surfaces conflicts to the operator.
- Bad, because lazy-create-at-sign-in produces a Person row with sparse fields (`firstName` / `lastName` from the Entra `displayName` split, no postal address, no phone). Acceptable for v1 since dossiers / RH consumers do not exist yet; reconciliation with Pléiades data at sync time fills the gaps.
- Neutral, because `Region.code` / `Delegation.code` / `Etablissement.finess` as primary keys preclude renames. APF's INSEE codes are stable; if a délégation merges, the row is deleted + a new one is inserted with the new code. The cost is well-bounded.

### Confirmation

- **Migration tests.** Prisma migration emits a SQL file; the `infra/local` dev stack runs it on fresh boot. Manual + a small `e2e` spec exercising the lazy-create path with a stubbed Entra response.
- **PrismaScopeResolver integration test.** Two personas (one with `etablissement:0330800013`, one with `unrestricted`) signed in, scopes round-trip from DB → Principal → `principalCoversResource`.
- **`Person.source` enum-as-string is single-sourced.** A small constant array in `apps/portal-bff/src/users/person-source.ts` lists the legal values; the catalogue-drift gate ([ADR-0025 §"Confirmation"](0025-authorization-model-privileges-roles-scopes.md)) extends to assert every string written to `Person.source` is in the catalogue. Same posture as the `Privilege` / `FunctionalRole` catalogues.
- **`Etablissement.kind` enum-as-string.** Same posture as `Person.source`. Legal values: `'etablissement'`, `'siege'`. Extending to `'preprod-placeholder'` etc. is an ADR amendment.

## Pros and Cons of the Options

### Option B — `Person` golden record + `User` overlay (chosen)

- Good, because Person-without-User is a valid state — bénéficiaires + alumni + Pléiades pre-provisioning.
- Good, because portal-only fields (`lastSignInAt`, future a11y preferences, future audit flags) ride on `User`, not on the shared Person record that Pléiades may overwrite.
- Good, because the ADR-0025 stubs resolve naturally — `personId` ≠ `userId` reflects the two-concern split that was already designed in.
- Bad, because two tables means two queries on the OIDC callback hot path. Mitigation: a single Prisma `include` keeps it to one round trip.
- Neutral, because reconciling lazy-created Person rows with later Pléiades data needs a documented merge policy — that policy is ADR-0027's territory and is easier to design with this shape than with Option A.

### Option A — `User`-only

- Good, because one table is the smallest possible thing.
- Bad, because dossiers held by non-portal-user beneficiaries have nowhere to anchor — either a `Dossier.beneficiaryUserId` that violates the "User = signed-in user" invariant, or a denormalised string copy of the beneficiary's name (no golden record).
- Bad, because Pléiades pre-provisioning requires a User row to exist before any sign-in; that User would be a non-signed-in account, contradicting the table's name.
- Bad, because portal-only state (`lastSignInAt`) coexists with HR-owned data in a single table — Pléiades sync would overwrite portal-only fields unless the sync logic carefully avoids them.

### Option C — `Person` lives in Entra

- Good, because there is no portal-side identity drift to manage.
- Bad, because non-employees + non-elus do not exist in Entra (bénéficiaires, alumni, dossier-holders). They are by far the larger population.
- Bad, because Entra's storage of attributes is per-tenant and not designed for queryable golden records — listing every salarié in Bordeaux means walking the API, not SELECT.
- Bad, because the [ADR-0008](0008-identity-model-entra-workforce-dual-audience.md) dual-audience design anticipated External ID activation for non-workforce — that flips the audience but does not give bénéficiaires Entra identities by default.

### Option D — `Person` + embedded facet columns

- Good, because one less join when reading "the salarié record for Person X".
- Bad, because `Person.salarie_etablissement_id`, `Person.elu_mandat_type`, `Person.adherent_cotisation_status`, … each introduce a NULL column that 95% of rows leave unused — schema bloat without normalization gains.
- Bad, because Pléiades data shape evolves independently from Acteurs+ data shape; embedding both in `Person` means every Pléiades schema change touches the table Acteurs+ rows also live in. Separate facet tables ride their own sync's lifecycle.

## More Information

**Phasing.** This ADR is decision-only. Implementation lands in two PRs once the ADR is accepted:

1. **PR — Prisma schema + lazy provisioner.** `Person`, `User`, `Region`, `Delegation`, `Etablissement`, `UserScope` models; `PersonAndUserProvisioner` called from `SessionEstablisher`; `Person.source` + `Etablissement.kind` constants + drift-gate extension; updated `PrincipalBuilder` to populate `Principal.user.{id, personId}` from the real rows.
2. **PR — `PrismaScopeResolver` + admin UI scope-seeding screen + test-tenant seed.** Replaces `StubScopeResolver` in the AuthModule. Seeds the 19 test personas' `user_scopes` rows per `notes/test-tenant-role-assignments.md`. Adds an `/admin/users/:id/scopes` admin-app screen for manual scope management.

**Follow-up ADRs.**

- **[ADR-0027](#) — Pléiades + Acteurs+ syncs + facet schemas.** Specifies how `Person` rows are populated from upstream, how facets attach (`Salarie`, `Adherent`, `Benevole`, `Elu`, `Beneficiaire`, `PartenaireExterne`), the reconciliation policy between sync-owned and admin-UI-owned fields, and how `user_scopes` is computed from facet relationships.
- **A future ADR — time-bound roles.** `UserScope.expiresAt` already exists; the corresponding facet-level mechanism (interim director for two months, treasurer mandate from 2026 to 2029) lands when the use case is concrete.