Six-item frontend performance pass on the SvelteKit app.
P1 — Move per-folder photo counts to a new sidecar endpoint and defer
the fetch to requestIdleCallback. The old client-side path fired one
/photos?count=1000 per folder from the browser (≈1 MB JSON × N folders)
on every cold sidebar mount; the new POST /api/sidecar/folders/counts
fans out over loopback with bounded concurrency and returns a single
{path: count} payload of a few KB.
P2 — Bound the visibleRange scroll-scan around the previous visible
band instead of sweeping every shell from index 0 on each scroll-rAF.
Falls back to a full sweep on cache miss (filter reset, programmatic
jump) so behaviour is unchanged at the edges.
P3 — Adaptive thumbnail size + srcset. PhotoTile now picks the smallest
PhotoPrism tile_* variant (100/224/500) that covers the user's grid
preset at the current DPR. Adds decoding="async".
P4 — Lift the selection check above the {#each} loop. Mostly readability
— SvelteSet.has() is already per-key reactive — but keeps the hot loop
body terse.
P5 — Split dedupedAll / photos derivations so filter-store mutations
(search-as-you-type, section toggles) don't re-walk every loaded page;
only the cheap folder-scope filter re-runs.
P6 — Dynamic-import PreviewOverlay on first preview.uid !== null and
cache the loaded module; closing the overlay leaves the component
mounted with its internal {#if} collapsing the DOM.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Replace the Node prototype (server.mjs) with the stack the merge plan
calls for: Go 1.25, Gin for routing, GORM + MariaDB for persistence.
Same wire contract on /api/sidecar/* so the SvelteKit client doesn't
change.
- Marks move from a JSON file on disk to mule_sidecar.marks (auto-
migrated by GORM on first boot). The Node prototype's marks.json
was dev-only; not migrated.
- Folder/rename/heap-convert/duplicates handlers reproduce the
prototype's behaviour, including the path-traversal defence
(resolveUnderRoot + EvalSymlinks), the size-bucket prefilter for
the duplicate hasher, and the background reindex fire-and-forget
pattern.
- Auth model unchanged: requireSession middleware proxies the
caller's X-Auth-Token to PhotoPrism's /api/v1/photos?count=1
before any destructive op.
- Expose pp-mariadb on 127.0.0.1:3306 in docker-compose so the
host Go process can reach mule_sidecar.* without joining the
container network.
- Archive the Node prototype under sidecar/legacy/server.mjs for
one cycle as reference.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
