Remove out-of-region location data when dispatch scope changes
A dispatcher moves from North depot coverage to East, but an existing stream continues delivering North vehicle coordinates. Hidden markers remain in the browser store.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Authorization · Cache isolation · Data minimization
Estimated field mix
- Security40%
- Real-time systems30%
- Privacy engineering30%
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
The fictional Cedar delivery depot dispatches vans through a browser map and accessible list. Synthetic telemetry arrives through a gateway with device sequence numbers. This is operational fleet software practice; no real driver tracking, employee scoring, or routing safety guarantee is part of the project.
Setup prerequisites
- Synthetic vehicle telemetry with device sessions and sequence numbers
- Dispatch assignment and authorized region API contracts
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- FLEET-101 · Keep invalid coordinates from appearing as real vans
- FLEET-103 · Fit selected vehicles without zooming out across the entire planet
- FLEET-102 · Show dispatchers how old each vehicle position is
- FLEET-104 · Prevent delayed telemetry from moving a van backwards
- FLEET-105 · Reconnect the map without losing updates between snapshot and stream
- FLEET-106 · Resolve competing dispatch assignments explicitly
Acceptance criteria
- Subscriptions and snapshot queries enforce current authorized region at the service boundary.
- Scope changes close old delivery, clear disallowed cached positions, and reconcile a new authorized snapshot.
- Diagnostics contain safe event categories and IDs, not raw coordinate trails or personal driver details.
Implementation constraints
- Use synthetic fleet data and do not add employee behavior scores or continuous personal-device tracking.
Verification to include
- Switch from North to East and verify only authorized East vehicles remain in storage and presentation.
- Queue an old-region event during scope revocation; reject it after the documented barrier and deny a forged region query.
Deliverables
- Region-scoped delivery lifecycle and cross-region denial tests
Rollout and recovery
Require this before multi-depot pilots; close all location streams when current scope cannot be established.
Value of the work
For the engineer: Practice geospatial boundaries, stream ordering, snapshot recovery, and concurrent operational commands.
For the team: Inspect whether a developer keeps dispatch decisions grounded in current authorized data and exposes uncertainty during outages.
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.