Apply offline operations with a durable deduplication record
The server applies a change, loses the response, then reapplies it after the tablet reconnects.
- Focused work estimate
- 3h 30m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- Transactions · Idempotency
Estimated field mix
- Distributed systems50%
- Database engineering50%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
A fictional field team inspects equipment with intermittent connectivity. Two tablets can edit the same checklist and an old upload may restore a deleted finding.
Setup prerequisites
- Create two local client-state simulators and a synthetic inspection API.
- Use fabricated notes and local attachment bytes.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Commit operation identity and inspection mutation atomically.
- Return the original safe outcome for identical retries.
- Keep rejected authorization separate from accepted-operation history.
Implementation constraints
- Scope deduplication to the authorized client and operation identity.
Verification to include
- Drop the response after commit and retry to one revision.
- Force transaction rollback and verify the operation remains retryable without a partial edit.
Deliverables
- Idempotent sync transaction
Rollout and recovery
Canary one synthetic client; pause replay when canonical operation identity is inconsistent.
Value of the work
For the engineer: Practice offline synchronization, causal revisions and conflict resolution.
For the team: Review whether field work survives disconnection without hiding conflicting observations.
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.