kandev/docs/plans/github-pr-review-rerequest/task-09-key-scoped-cache-invalidation.md

id, title, status, wave, depends_on, plan, spec

id	title	status	wave	depends_on	plan	spec
09-key-scoped-cache-invalidation	Key-scoped PR cache invalidation	done	4	01-backend-review-request	plan.md	../../specs/ui/github-pr-review-actions.md

Task 09: Key-scoped PR cache invalidation

Acceptance

• Review re-request invalidation prevents an older fill for the affected PR from repopulating either feedback or status cache.
• An unrelated PR's concurrent cache fill still completes and remains cached.
• Existing cache-wide clear and repository-error invalidation race guarantees remain unchanged.
• Deterministic barrier tests cover same-key and unrelated-key concurrent fills.

Ownership

• apps/backend/internal/github/ttl_cache.go
• apps/backend/internal/github/ttl_cache_test.go
• apps/backend/internal/github/service_pr.go
• apps/backend/internal/github/service_request_review_test.go

Do not convert repository-error caching or edit controllers, transports, frontend, E2E, docs, spec, or plan.md.

Output contract

Use TDD. Report RED/GREEN evidence, exact race-enabled checks, files changed, compatibility risks, and set only this task file's status to done.