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HUE-008 — Implement schema migrations and append-only semantic event journal

Canonical source: docs/roadmap/issues.json · HUE-008

Specification status: TBI · Readiness: agent:blocked

Goal

Section titled “Goal”

Provide transactional canonical storage and resumable semantic event history.

Scope

Section titled “Scope”
  • Implement schema/version migration framework
  • Append events atomically with state transitions
  • Expose cursor-based subscription/replay

Acceptance criteria

Section titled “Acceptance criteria”
  • Interrupted transaction does not expose partial state
  • Cursor resumes without loss/duplication
  • Backup occurs before destructive migration
  • Tests cover sequence and concurrency

Dependencies

Section titled “Dependencies”
  • HUE-003
  • HUE-007

Non-goals

Section titled “Non-goals”
  • None beyond the documented scope.

Product contract

Section titled “Product contract”
  • Follow the milestone and repository product contract.

Implementation handoff requirements

Section titled “Implementation handoff requirements”
  • Preserve the documented security, project, memory and event boundaries.
  • Add or update automated tests for every observable acceptance criterion.
  • Provide real verification output; do not rely on a worker/agent self-report.
  • Update only the exact documentation sections whose status changed.
  • Include screenshots or a recording for user-interface changes.
  • Include migration, rollback and recovery notes for data/state changes.
  • Link the pull request to this issue with Closes #<issue-number>.