docs(design): adaptive client cache eviction policy (#23)#322
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Specify the automatic, bounded client cache the issue asks for: cache recently-viewed assets, evict least-recently-accessed first, and within a sweep evict in tier-size order (original -> preview -> thumbnail), leaving the metadata/LQIP tier effectively never reclaimed. Extends the existing owner docs rather than adding a new one (SSoT): - filesystem/client.md Space Recovery: split into automatic cache management (budget, recency promotion, LRU, tier order, pin exemption) and user-driven reclamation; add unit validation cases. - import/download-sync.md: cross-link recently-viewed retention to the owner. - DEFERRED.md: record that the policy is specified but implementation is deferred, with its capsule-core::db / capsule-sdk seam. Implementation deferred per the issue's updated scope (documentation only).
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What
Documents the adaptive client-side caching / eviction policy requested in #23. Per the maintainer's updated scope on that issue, this is documentation only — implementation is deferred.
The three asks from #23 are now explicitly specified:
Approach
Extends the existing owner docs rather than adding a new one, to respect the repo's Single-Source-of-Truth rule (
filesystem/client.mdalready owns "space recovery";download-sync.mdowns tiered fetch + connectivity adaptation). No new SSoT owner row, no module-map change.design/filesystem/client.md— "Space Recovery" split into Automatic cache management (user-configurable budget, recency promotion, LRU eviction, tier order within a sweep, pin exemption, transparent re-fetch) and User-driven reclamation. Adds four unit-tier validation cases.design/import/download-sync.md— "Prefetch and Frugality" cross-links recently-viewed retention to the owner doc (mechanism mention only; no restatement).DEFERRED.md— records the policy as specified-but-not-implemented, with its seam (capsule-core::dblast-access tracking +capsule-core::librarysweep, driven bycapsule-sdkconnection-class detection).Verification
astro buildpasses; starlight link validator reports all internal links valid (46+ pages).filesystem/client.md;download-sync.mdlinks to it.Refs #23 (left open to track implementation).