Define online presence as an unexpired connection lease
A green dot remains after the browser closes. Replace the permanent flag with explicitly expiring presence.
- Focused work estimate
- 1h 15m + prerequisites
- Priority in the scenario
- Medium
- Engineering practice
- TTL · State modeling
Estimated field mix
- Real-time systems60%
- Distributed systems40%
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 document team Pine shows collaboration presence for synthetic accounts. Build a loopback WebSocket server and injected clocks; no message content or activity surveillance is required.
Setup prerequisites
- Create synthetic memberships and session identifiers.
- Implement controllable sockets and an in-memory TTL adapter.
Preceding work
No earlier ticket is required. Complete the project setup above.
Acceptance criteria
- Active lease shows connected
- Expiry removes connected state
- UI explains connection meaning
Implementation constraints
- Do not infer human attention from a socket.
Verification to include
- Advance clock before expiry
- Advance beyond expiry without disconnect
Deliverables
- Lease contract and clock cases
Rollout and recovery
Hide presence if lease freshness cannot be established.
Value of the work
For the engineer: Practice ephemeral state, ordering and reconnect semantics.
For the team: Inspect whether online indicators avoid stale or unauthorized claims.
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.