fix(tenancy): AccountId is a concurrency token, so the database refuses a detached cross-tenant write (#562) - #671
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Included review availability: Your plan provides up to 8 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe change configures non-key ChangesTenant write protection
Estimated code review effort: 3 (Moderate) | ~25 minutes Sequence Diagram(s)sequenceDiagram
participant Caller
participant AppDbContext
participant Database
participant TenantStampInterceptor
participant SecurityEventLog
Caller->>AppDbContext: Submit detached update or delete
AppDbContext->>Database: Execute write with original AccountId predicate
Database-->>AppDbContext: Return zero affected rows
AppDbContext->>TenantStampInterceptor: Raise DbUpdateConcurrencyException
TenantStampInterceptor->>SecurityEventLog: Log Tenant.WriteRefusedByDatabase
TenantStampInterceptor-->>Caller: Preserve DbUpdateConcurrencyException
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Description checkExplanation The description explains the problem, solution, affected behavior, verification commands and results, scope boundaries, mutation checks, and linked issue. It omits the template Checklist section, but the required change and verification details are otherwise complete. Full details: Linked Issues checkExplanation The implementation satisfies issue [ Full details: Out of Scope Changes checkExplanation No unrelated executable changes are identified. The added tests, interceptor logging, model snapshot, empty migration, security documentation, decision record, and implementation runbooks support the tenant-write protection objective. Full details: Docstring CoverageExplanation Docstring coverage is 28.21% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 39 functions across 10 files. (1 skipped: 1 unsupported.)
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Inline comments:
In `@tests/Cluckwork.Api.IntegrationTests/TenantWriteRefusalLoggingTests.cs`:
- Around line 16-18: Update the test comment describing TenantStampInterceptor
so it identifies the ThrowingConcurrencyException hooks as the source of
Tenant.WriteRefusedByDatabase logging, replacing the incorrect SaveChangesFailed
reference while preserving the existing entity, key, and tenant details.
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AGENTS.mddocs/decisions/530-multi-farm-tenancy.mddocs/plans/562-tenant-write-token/01-implementer-runbook.mddocs/security/log-redaction-policy.mdsrc/Cluckwork.Application/Common/SecurityEvents.cssrc/Cluckwork.Infrastructure/Persistence/AppDbContext.cssrc/Cluckwork.Infrastructure/Persistence/Interceptors/TenantStampInterceptor.cssrc/Cluckwork.Infrastructure/Persistence/Migrations/20260903012839_AccountIdConcurrencyToken.Designer.cssrc/Cluckwork.Infrastructure/Persistence/Migrations/20260903012839_AccountIdConcurrencyToken.cssrc/Cluckwork.Infrastructure/Persistence/Migrations/AppDbContextModelSnapshot.cstests/Cluckwork.Api.IntegrationTests/AccountIdConcurrencyTokenModelTests.cstests/Cluckwork.Api.IntegrationTests/DetachedTenantWriteTests.cstests/Cluckwork.Api.IntegrationTests/TenantWriteRefusalLoggingTests.cstests/Cluckwork.Api.IntegrationTests/TrackedMutationReadTests.cs
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…ayer is open for which shape (#562)
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Inline comments:
In `@docs/plans/562-tenant-write-token/03-fix-increment-2.md`:
- Line 37: Change the “INCREMENT 8” heading to level 2 by using two hash
characters, so the subsequent “### 8a” heading follows the required markdown
heading hierarchy.
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docs/plans/562-tenant-write-token/03-fix-increment-2.mdtests/Cluckwork.Api.IntegrationTests/AccountIdConcurrencyTokenModelTests.cstests/Cluckwork.Api.IntegrationTests/TenantWriteRefusalLoggingTests.cs
🚧 Files skipped from review as they are similar to previous changes (2)
- tests/Cluckwork.Api.IntegrationTests/AccountIdConcurrencyTokenModelTests.cs
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…e names every non-Guid value (#562)
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Review loop stopped deliberately at head Count, per the repo's review-response rule 7:
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In `@docs/plans/562-tenant-write-token/04-fix-increment-3.md`:
- Line 38: Update both fenced code blocks in the document, including the blocks
near the existing opening fences, to declare the text language identifier by
changing each opening fence to use text. Keep the block contents unchanged.
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docs/plans/562-tenant-write-token/03-fix-increment-2.mddocs/plans/562-tenant-write-token/04-fix-increment-3.mdtests/Cluckwork.Api.IntegrationTests/AccountIdConcurrencyTokenModelTests.cs
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Closes #562. Part of epic #530 (T8e).
What
AccountIdis now an EF concurrency token on every entity that carries one — 29 entity types, discovered by a model walk at the end ofAppDbContext.OnModelCreating, excluding the one primary-keyAccountId(SimulationSeedState). EveryUPDATE/DELETEthe database runs therefore carriesAND "AccountId" = @original; the interceptor already requires that original to be the resolved tenant's, so a row that is not the tenant's matches nothing and EF throwsDbUpdateConcurrencyException.That refusal is logged under a resolved tenant as the new security event
Tenant.WriteRefusedByDatabase(entity, key, tenant) from the interceptor'sThrowingConcurrencyExceptionhook, and the exception propagates unchanged (409 via the global handler).Why — reproduced, not inferred
Serving farm A, a hand-built stub carrying farm B's row id and A's
AccountId, never loaded, on the unmodified tree:Update(stub)→ no exception, B's row relabelled to A (theft);Remove(stub)→ no exception, B's row deleted;Attach(stub)asUnchanged+ edit only the ownedMoney→ no exception, B's row's cost rewritten — the interceptor never sees an entry it can judge (principalUnchanged, owned entry has noAccountId). This one was live, not latent, and was found by the seam's falsifying review.All three are refused with the token in place, rows intact —
DetachedTenantWriteTests.What did not change
TenantWriteGuardTests, 9 tests, untouched).TrackedMutationReadTests) — now defence in depth rather than the guarantee.AccountIdConcurrencyTokenmigration is deliberately empty and exists to keep the snapshot equal to the model (has-pending-model-changes→ none;docs/schemaunchanged andgenerate.sh --checkgreen).Still outside both layers (recorded, not hidden)
AccountIdproperty — Identity's own six tables;AspNetUserRolesis live RBAC state → Write guard and #562 token both skip Identity's AccountId-less tables; AspNetUserRoles is live RBAC state with no tenant column #670.ExecuteUpdate/ExecuteDelete/ raw SQL — governed by Cross-tenant isolation hardening: enumerating IgnoreQueryFilters guard + two-farm end-to-end matrix #536's Roslyn guard.IdentityProvider.cs:1762(its token isConcurrencyStamp) — noted, not touched here.Mutation checks (implementer-run; the driver re-runs every row before the merge ask)
thrown=noneDetachedTenantWriteTests(all 3),AccountIdConcurrencyTokenModelTests.EveryNonKeyAccountId…(29 not tokens),TenantWriteRefusalLoggingTests.DetachedStubRefused…(thrown=none). Restored, rebuilt, re-confirmed 9/9 green.Customer.AccountIdCustomer.AccountId. Restored, rebuilt, re-confirmed green.Assert.False() Failure: Expected: False / Actual: True. Restored, rebuilt, re-confirmed green.Assert.Single() Failure: The collection was empty. Restored, rebuilt, re-confirmed green.Assert.Empty() Failure: Collection was not empty, logged event carriedTenantAccountId=00000000-0000-0000-0000-000000000000. Restored, rebuilt, re-confirmed green.Assert.Single() Failure: The collection was empty, confirmsSaveChangesAsyncroutes throughThrowingConcurrencyExceptionAsync. Restored, rebuilt, re-confirmed green.SaveChanges(), confirmed viagrep -rn "\.SaveChanges()" src→ 0 hits). Restored, rebuilt, re-confirmed green.Suite
Note: the first foreground G2 run showed one unrelated flake (
FakeOtlpCollectorTests.Predicate_wait_throws_a_terminal_error_completed_at_the_timeout_catch_boundary—HttpListenerException: Address already in use, a port-collision in test infrastructure outside this slice's files). An immediate rerun was fully green (1654/1654); the numbers above are from that clean run.Summary by CodeRabbit