noCV
ATENANT-105 · Protect every write path

Keep case-comment inserts scoped during concurrent parent changes

Practice briefTaskAdvanced

A comment command checks the case once, then writes after an administrator changes related project state.

Focused work estimate
4h + prerequisites
Priority in the scenario
Medium
Engineering practice
Transactions · Ownership invariants

Estimated field mix

  • Database engineering60%
  • Backend20%
  • Security20%

Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.

Your next step

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Project context

A fictional case-management application filters most requests correctly, but imports and background commands can connect a case to another organization's project or assignee.

Setup prerequisites

  • Create two synthetic organizations with overlapping display names.
  • Use repository-level authorization and migration-backed constraints.

Preceding work

Complete these dependencies, or supply their agreed outputs before taking this ticket.

Acceptance criteria

  • Authorize and insert against current parent ownership in one boundary.
  • Prevent parent reassignment that would violate child scope.
  • Return a conflict rather than attach a comment ambiguously.

Implementation constraints

  • Prefer immutable tenant ownership for existing entities.

Verification to include

  • Insert a comment under stable ownership.
  • Race a prohibited parent-scope change and verify no cross-tenant comment results.

Deliverables

  • Comment transaction and ownership race test

Rollout and recovery

Enable the guarded command; disable tenant reassignment paths that lack a migration protocol.

Value of the work

For the engineer: Practice tenant-aware keys, foreign keys and direct-write denial tests.

For the team: Review defense in depth for data isolation across ordinary and privileged writers.

Evidence boundaries

Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.

Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.