fix(tenancy): AspNetUserRoles carries a tenant column, so a role write naming another farm's user is refused (#670)

[mforce]

Closes #670. Follow-on from #562 (PR #671); part of epic #530.

What

AspNetUserRoles — live RBAC state — now carries a tenant column the two existing write-side layers already cover. Both TenantStampInterceptor and the #562 concurrency-token walk select entities by a property named AccountId; IdentityUserRole<Guid> had none, so both skipped it. The seam is the smallest way into those layers rather than a third one:

• a shadow Guid AccountId on IdentityUserRole<Guid> — the interceptor stamps it on Added and verifies it on Deleted, and the walk turns it into a concurrency token, with no change to either;
• a composite foreign key (UserId, AccountId) → AspNetUsers(Id, AccountId) — so the stamped value is provably the user's own farm, and a write under no resolved tenant (value still Guid.Empty) is refused rather than inserted unowned.

One migration (AddAccountIdToUserRoles): the generated operations plus two hand-inserted SQL steps between AddColumn and AddForeignKey — the backfill from AspNetUsers, then DROP DEFAULT. docs/schema regenerated.

Why — reproduced, not inferred

Serving farm A, a hand-built IdentityUserRole row naming farm B's user, on the unmodified tree:

• Add → no exception, a role granted to B's user;
• Remove of B's Owner row → no exception, B's Owner grant deleted.

With the seam: Add → DbUpdateException / Postgres 23503 on the FK; unforged Remove → TenantWriteMismatchException (interceptor); a forged Remove whose shadow value claims farm A → DbUpdateConcurrencyException (the token); a role write under no resolved tenant → 23503. Rows intact in every case — UserRoleTenantWriteTests.

Callers

Every production role write already runs under a resolved tenant (CreateUserAsync, ChangeUserRoleAsync incl. RemoveFromRolesAsync; bootstrap-admin, provision-account and seed --profile simulation all Resolve before creating the Owner). Nine test-side scopes did not, and the FK refused them — each gains one tenant.Resolve line, so the tests now model production.

What did not change

• TenantStampInterceptor and the Write guard trusts OriginalValue as DB provenance; detached Update/Remove can bypass the tenant theft check #562 walk: zero lines. The seam is reached by name.
• The Cross-tenant isolation hardening: enumerating IgnoreQueryFilters guard + two-farm end-to-end matrix #536 scanner's classification of the eight db.UserRoles sites: UserRoles stays on the stricter non-tenant track (the split is on CLR shape — now stated as the rule in TenantBypassRealTreeTests).
• No query filter on IdentityUserRole (FirstRunStatusService reads it anonymously).
• No user-visible behaviour: no GLOSSARY or Help change. A hand-built cross-farm role write was a silent success and is now a database refusal.

Accepted risk (recorded in the 530 record, owner decision 2026-09-02)

AspNetUserClaims, AspNetUserLogins, AspNetUserTokens, AspNetRoleClaims keep no tenant column: nothing in src/ writes or reads them, and any direct db.<Set> access is already a #536 candidate. The residual is a future UserManager claim/login/token call.

Mutation checks (implementer-run; the driver re-runs every row before the merge ask)

Row	Named test	Expected	Observed
C rename the seam's local	(none)	GREEN	GREEN — build clean, all 8 tests in the affected classes (UserRoleTenantWriteTests ×4, UserRoleAccountIdModelTests ×2, AccountIdConcurrencyTokenModelTests ×2) passed. No assertion anywhere names the local variable.
M1 delete the composite FK from the migration	DetachedAdd…	RED, thrown=none; row exists after=True	RED as expected: DetachedAdd_RowForAnotherFarmsUser_IsRefusedByTheForeignKey → thrown=none; row exists after=True. Also red: Add_UnderNoResolvedTenant_IsRefusedByTheForeignKey (thrown=none; row exists after=True). UserRoleAccountIdMigrationTests stayed GREEN; both Remove tests stayed GREEN.
M2 walk skips IdentityUserRole (token layer isolated)	ForgedDetachedRemove…	RED, thrown=none; … exists after=False	RED as expected: ForgedDetachedRemove_StubClaimingThisFarm_IsRefusedByTheDatabase → thrown=none; B's Owner row exists after=False. Also red: UserRoleAccountIdModelTests.IdentityUserRole_CarriesAShadowGuidAccountId_ThatIsAConcurrencyToken (is not a concurrency token) and AccountIdConcurrencyTokenModelTests.EveryNonKeyAccountId_IsAConcurrencyToken (Not a token on: IdentityUserRole.AccountId). Unforged Remove test stayed GREEN.
M3 interceptor blind to Guid.Empty (single layer)	DetachedRemove…	RED on type: thrown=DbUpdateConcurrencyException, row intact	RED as expected: DetachedRemove_StubOfAnotherFarmsRow_IsRefusedByTheInterceptor → thrown=DbUpdateConcurrencyException / inner=-; B's Owner row exists after=True. Every other test in the class stayed green; TenantWriteGuardTests (9) stayed GREEN.
M4 delete the seam block	IdentityUserRole_CarriesAShadowGuidAccountId…	RED, has no AccountId property	RED as expected: both tests in UserRoleAccountIdModelTests failed — IdentityUserRole<Guid> has no AccountId property — the seam is missing (#670) and no foreign key on (UserId, AccountId) — found: RoleId; UserId.
M5 delete the backfill	TheUserRolesMigration_Backfills…	RED, 23503 during migrate	RED as expected: migrating forward over a pre-existing role row failed — the backfill did not run before the FK was created: 23503 insert or update on table "AspNetUserRoles" violates foreign key constraint "FK_AspNetUserRoles_AspNetUsers_UserId_AccountId".
M6 delete DROP DEFAULT	same	RED, still carries a column DEFAULT	RED as expected: AspNetUserRoles.AccountId still carries a column DEFAULT ('00000000-0000-0000-0000-000000000000'::uuid) — the DROP DEFAULT step did not run.
M7 M2 + M3 (combined)	DetachedRemove…	RED, thrown=none; … exists after=False	RED as expected: DetachedRemove_StubOfAnotherFarmsRow_IsRefusedByTheInterceptor → thrown=none; B's Owner row exists after=False — the captured symptom, proving the two layers together are what was reached. Also red: the forged test and both model tests (as M2).

Every row was restored, rebuilt (G1 clean) and re-confirmed green after mutation; no MUTANT/DEBUG-670 markers remain (git grep clean).

Suite

Total tests: 10
     Passed: 10
 (Cluckwork.AppHost.Tests)

Total tests: 365
     Passed: 365
 (Cluckwork.Domain.Tests)

Total tests: 234
     Passed: 234
 (Cluckwork.Application.Tests)

Total tests: 1662
     Passed: 1662
 (Cluckwork.Api.IntegrationTests)

tools/schema-docs/generate.sh --check → docs/schema/ is up to date. (G4)

Summary by CodeRabbit

• Security Enhancements

  • User-role assignments are now isolated by account, rejecting cross-account or unresolved-account role changes.
  • Safeguards reject forged, detached, relabeled, or deleted role updates targeting another account.
  • Role changes without a resolved account are rejected.

• Data Migration

  • Existing role assignments are automatically associated with the correct account during migration.

• Documentation

  • Updated tenancy, database schema, and migration documentation to reflect account-scoped user roles.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: 555c1539-f9ed-4a6a-99fe-88225aa06d4e

📥 Commits

Reviewing files that changed from the base of the PR and between 2878fb0 and 8a4f251.

📒 Files selected for processing (3)

• docs/plans/670-user-roles-account-id/01-implementer-runbook.md
• docs/plans/670-user-roles-account-id/02-fix-increment-1.md
• docs/plans/670-user-roles-account-id/04-fix-increment-3.md

🚧 Files skipped from review as they are similar to previous changes (2)

• docs/plans/670-user-roles-account-id/02-fix-increment-1.md
• docs/plans/670-user-roles-account-id/01-implementer-runbook.md

Included review availability: Your plan provides up to 8 included reviews per hour; 4 remain after this review.

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📝 Walkthrough

Walkthrough

AspNetUserRoles now stores a shadow tenant key. EF and PostgreSQL enforce a composite relationship to AspNetUsers. The migration backfills existing rows. Tests cover model metadata, migration behavior, tenant-aware writes, and unresolved-tenant rejection.

Changes

User-role tenant isolation

Layer / File(s)	Summary
Tenancy contract and implementation plan AGENTS.md, docs/decisions/..., docs/plans/670-user-roles-account-id/*	Documents shadow AccountId enforcement, remaining Identity-table risks, and corrected staged-file verification commands.
EF model and database migration src/Cluckwork.Infrastructure/Persistence/AppDbContext.cs, src/Cluckwork.Infrastructure/Persistence/Migrations/*	Configures the shadow concurrency-token property and composite foreign key. The migration backfills AccountId, removes the default, and adds indexes and constraints.
Tenant-aware callers and regression tests tests/Cluckwork.Api.IntegrationTests/*, tests/Cluckwork.Application.Tests/TenantBypass/*	Tests model metadata, migration backfill, cross-tenant write rejection, concurrency protection, and no-tenant failures. Test helpers resolve tenant context before Identity writes.
Schema documentation updates docs/schema/*	Documents the AccountId column and composite user-role relationship across schema views.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: ⚪ Minimal · up to 8a4f2

The change adds tenant identity enforcement for user-role records and documents its implementation steps, reducing the risk of cross-tenant role writes. No current merge-blocking risk is identified.

Sequence Diagram(s)

sequenceDiagram
  participant TestCaller
  participant TenantContext
  participant UserManager
  participant TenantStampInterceptor
  participant PostgreSQL
  TestCaller->>TenantContext: Resolve target AccountId
  TestCaller->>UserManager: Add or remove user role
  UserManager->>TenantStampInterceptor: Save IdentityUserRole
  TenantStampInterceptor->>PostgreSQL: Validate AccountId and concurrency token
  PostgreSQL-->>UserManager: Accept or reject role row

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 32 functions across 13 files. (3 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise, uses the required conventional commit format, and clearly identifies the main change: adding tenant enforcement to AspNetUserRoles role writes.
Description check	✅ Passed	The description explains the change, motivation, implementation, verification results, affected callers, accepted risks, and test coverage. It omits the template Checklist section, but the core requir…
Linked Issues check	✅ Passed	The pull request satisfies issue #670 by adding a shadow AccountId, configuring the composite foreign key, backfilling existing rows, removing the temporary default, and testing cross-tenant and unres…
Out of Scope Changes check	✅ Passed	The changes remain related to issue #670 and its tenancy objectives. Schema documentation, decision records, runbooks, tenant-scope test updates, migration tests, and model enforcement tests support t…

Full details: Description check

Explanation

The description explains the change, motivation, implementation, verification results, affected callers, accepted risks, and test coverage. It omits the template Checklist section, but the core required information is complete.

Full details: Linked Issues check

Explanation

The pull request satisfies issue #670 by adding a shadow AccountId, configuring the composite foreign key, backfilling existing rows, removing the temporary default, and testing cross-tenant and unresolved-tenant role writes.

Full details: Out of Scope Changes check

Explanation

The changes remain related to issue #670 and its tenancy objectives. Schema documentation, decision records, runbooks, tenant-scope test updates, migration tests, and model enforcement tests support the implementation and verification.

Full details: Docstring Coverage

Explanation

Docstring coverage is 37.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 32 functions across 13 files. (3 skipped: 3 unsupported.)

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[mforce]

@coderabbitai full review

Deliberate single deep re-trigger per this repo's review-response rules: the CHILL pass approved 4d4f73de clean, and this diff carries tenant-isolation logic (a shadow AccountId + composite FK on AspNetUserRoles reached by the existing write guards) and a migration with a backfill on live RBAC state — the two classes where a shallow pass is weakest. One round; it stops after this whatever it returns.

[coderabbitai]

@mforce: I will perform one full review of PR #675. I will focus on tenant isolation, the AspNetUserRoles shadow AccountId, the composite foreign key, and the migration backfill.

✅ Action performed

Full review finished.

[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In `@docs/plans/670-user-roles-account-id/02-fix-increment-1.md`:
- Line 146: Update the staged-status verification after git add: use git diff
--cached --name-only and expect the three staged files, or move the empty git
status --porcelain assertion until after git commit.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: 3bce9603-9c1f-4b54-a129-8e82ebd95630

📥 Commits

Reviewing files that changed from the base of the PR and between 4d4f73d and 6586d19.

⛔ Files ignored due to path filters (1)

• tests/Cluckwork.Application.Tests/TenantBypass/Data/filter-free-set-sites.tsv is excluded by !**/*.tsv

📒 Files selected for processing (2)

• docs/plans/670-user-roles-account-id/02-fix-increment-1.md
• tests/Cluckwork.Api.IntegrationTests/UserRoleTenantWriteTests.cs

Included review availability: Your plan provides up to 8 included reviews per hour; 5 remain after this review.

[mforce]

Review loop — stopped deliberately at 2 rounds

Per this repo's review-response rules (rule 7), the loop stops after two consecutive rounds that confirm no defect in the product. Both rounds here were that shape; the four owner-chosen seats (repo-rules, false-green, caller-breakage, tenant-isolation-adversary) ran per head, beside CodeRabbit.

Round 1 on 4d4f73de — three seats clean; CodeRabbit CHILL approval (no actionable comments) and one deliberate deep re-trigger (full review, no actionable comments). Two findings, neither in product code:

• adversary (defer): the tracked-load-then-mutate shape on AspNetUserRoles (this table has no read filter, so loading another farm's grant is a one-line query) was refused by the interceptor's original-value checks but pinned by no per-table test → 6586d19b adds TrackedRelabel_OfAnotherFarmsRow_IsRefusedByTheInterceptor and TrackedRemove_OfAnotherFarmsRow_IsRefusedByTheInterceptor. Their mutation rows (M8 blinds Modified's original check, M9 blinds Deleted's) were run by the driver and the implementer; M8 also showed the composite FK is the layer that absorbs a relabel once the interceptor is blind — the token's WHERE matches the true original, the FK rejects the new (user, farm) pair.
• repo-rules (sub-bar, confirmed): one stale tsv section header → same commit.

Round 2 on 6586d19b — three seats clean; CodeRabbit incremental (no actionable comments). Three findings, all against the decision record, none against code:

• the unresolved-tenant DELETE arm on this table is more reachable than on any filtered entity (no filter ⇒ no IgnoreQueryFilters() marker) and its real control — Cross-tenant isolation hardening: enumerating IgnoreQueryFilters guard + two-farm end-to-end matrix #536's scanner classifying every db.UserRoles site — was unnamed;
• RoleManager.DeleteAsync cascades every farm's grants of a role (AspNetRoles → AspNetUserRoles ON DELETE CASCADE), invisible to both layers, no caller in src/, missing from the residual list;
• a pre-existing tsv rationale described DisableUser's role READ as a revocation.
  → 2878fb0b (docs + one rationale string; TenantBypass 34/34, TenancyDocsFreshnessTests green).

After round 2 closed — CodeRabbit's incremental review of 6586d19b (CHANGES_REQUESTED, one inline comment, driver's own defect): three fences in the committed runbooks expected an empty git status --porcelain right after git add, when staged files show until the commit → 8a4f2518 (three comment lines; thread replied with the SHA and resolved). No own-seat round was triggered for it, per the stop below.

Product code has not changed since d6594501, tests since 6586d19b. Every mutation row (C, M1–M9) was re-run by the driver on 6586d19b; 2878fb0b and 8a4f2518 are byte-identical to it under src/ and the integration tests, and the full suite was run by the driver on each (10 / 365 / 234 / 1664). Two incidental reds seen only under a loaded box during the driver's local runs (MultiInstanceIdempotencyTests once; two OtlpSubprocessExporterTests under a leaked CPU-pinned load generator, reproduced identically on the unmodified base) are environmental — #672's family — and are recorded in the driver's evidence; CI was green on every head.

No further round will be triggered from this side; the merge decision and whether to keep looping are the owner's.