kandev/docs/plans/subtask-detachment/task-01-backend-detachment.md

id, title, status, wave, depends_on, plan, spec

id	title	status	wave	depends_on	plan	spec
01-backend-detachment	Backend detach contract	done	1		plan.md	../../specs/tasks/requirements/subtask-detachment.md

Task 01: Backend detach contract

Acceptance

• POST /api/v1/tasks/:id/detach clears only the parent relationship and returns the updated task; root calls are idempotent.
• Detaching an inherit_parent task atomically stores shared_group mode without releasing workspace membership; other modes remain unchanged.
• The resulting task.updated payload explicitly clears parent_id, and the Office No parent mutation uses the same semantic operation.

Verification

cd apps/backend && rtk go test ./internal/task/service ./internal/task/handlers ./internal/office/dashboard

Files likely touched

• apps/backend/internal/task/service/service_detachment.go
• apps/backend/internal/task/service/service_detachment_test.go
• apps/backend/internal/task/service/service_events.go
• apps/backend/internal/task/handlers/task_handlers.go
• apps/backend/internal/task/handlers/task_http_handlers.go
• apps/backend/internal/task/handlers/task_http_handlers_test.go
• apps/backend/internal/office/dashboard/service_tasks.go
• apps/backend/internal/office/dashboard/handler.go

Dependencies

None.

Inputs

• Spec sections: What, Data model, API surface, Failure modes, Scenarios.
• Existing update pattern: Service.UpdateTask and httpUpdateTask.
• Existing workspace policy: WorkspacePolicy.MetadataBlock and orchestrator shared_group inheritance.

Output contract

Report the service/handler changes, tests run, files changed, blockers, residual risks, and update this task plus plan.md to done when acceptance passes.