Use incremental sync tokens without losing full-resync coverage
The provider invalidates a sync token, and the app interprets it as an empty calendar.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Synchronization
Estimated field mix
- Integrations60%
- Site reliability40%
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 booking service supports consultants in multiple time zones. Recurring events, revoked access, and delayed callbacks cause missed conflicts.
Setup prerequisites
- Author synthetic calendars and a local provider double with recurrence, timezone, and access-revocation cases.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
Acceptance criteria
- Distinguish token invalidation from no changes.
- Start a bounded full sync on invalidation.
- Keep existing availability marked stale until replacement completes.
Implementation constraints
- Never clear events because a provider request failed.
Verification to include
- Apply a normal incremental page.
- Invalidate the token and preserve stale records during recovery.
Deliverables
- Sync-token recovery.
Rollout and recovery
Pause definitive availability claims while full sync is incomplete.
Value of the work
For the engineer: Practice temporal modeling, synchronization lifecycles, and privacy-preserving projections.
For the team: Reduce scheduling ambiguity through explicit availability contracts and recoverable synchronization.
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.