Queue field-note synchronization by immutable operation ID
The same offline note uploads twice after a timeout. Persist an operation ID alongside each queued change.
- Focused work estimate
- 3h + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Idempotency · Transactions
Estimated field mix
- Mobile40%
- Database engineering30%
- Distributed systems30%
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
Fictional maintenance coordinator Elm dispatches non-safety-critical inspection visits. Implement a mobile application in an emulator with local API stubs; physical devices and credentials are unnecessary.
Setup prerequisites
- Create synthetic visits and a local sync adapter.
- Provide controllable connectivity and process-restart simulation.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Retries reuse ID
- Accepted changes leave queue atomically
- New edits create new operations
Implementation constraints
- Server stub must deduplicate operations.
Verification to include
- Replay accepted upload
- Crash after acceptance before dequeue
Deliverables
- Sync queue and replay tests
Rollout and recovery
Pause uploading without deleting queued work.
Value of the work
For the engineer: Practice durable mobile state and explicit sync conflicts.
For the team: Inspect how an engineer protects field work during disconnection.
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.