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+# Device icons, last-seen timer & uploadable icon sets — design
+
+Date: 2026-06-09
+Feature area: Void dashboard → LAN Devices band (`lan_devices`, migration 024)
+
+## Goal
+Let the user assign an icon to each discovered LAN device (device-type icon OR
+brand logo — "both"), show how long ago an absent device was last seen, and
+manage/extend the available icons by uploading new icon sets from Settings.
+
+## Background (existing code reused)
+- `lan_devices` table (migration 024): MAC-keyed inventory; already has
+  `last_seen timestamptz` and `present boolean`. No icon column yet.
+- `public/views/devices_band.js`: renders tiles + an edit (✎) flow; `/api/devices`
+  PATCH (`lib/api/routes/devices.js`, zod `patchBody`).
+- **Existing icon proxy** (reused for brand logos): `GET /api/icons/:slug.png`
+  → `lib/health/icons.js#getIcon()` fetches `walkxcode/dashboard-icons` PNGs via
+  jsDelivr and caches them to `/var/lib/void/icons`. `validSlug = ^[a-z0-9-]+$`.
+  `public/components/service_tile.js` renders `<img src=/api/icons/${slug}.png>`
+  with a letter fallback on error.
+
+## Icon model
+A device's `icon` value is one of:
+- `set:<set>:<name>`  → bundled/uploaded type icon, served `/api/icon-sets/<set>/<name>`
+- `brand:<slug>`      → dashboard-icons logo, served `/api/icons/<slug>.png` (existing)
+- `NULL`              → auto-default chosen by group/vendor (pure function)
+
+Auto-default mapping (group → bundled `devices` set):
+Network→router, Entertainment→tv, Smart Home→plug, Personal→phone, else→unknown.
+
+## Components
+
+### 1. Data — migration 02x
+`ALTER TABLE lan_devices ADD COLUMN icon text;` (nullable). No backfill (NULL =
+auto-default). Down: drop column.
+
+### 2. Bundled type-icon set (the "set of favicons")
+Download ~15 **Tabler Icons** (MIT) SVGs into the repo at
+`public/icons/devices/` as the read-only bundled set named `devices`:
+router, phone, tablet, laptop, desktop, tv, speaker, camera, printer, console,
+plug, server, watch, nas, unknown. Monochrome line icons → match blackflame.
+
+### 3. Uploadable icon sets (persistent, outside git)
+- Storage: `/var/lib/void/icon-sets/<set>/<name>.(svg|png)` (persistent volume,
+  survives redeploys — NOT in git-tracked `public/`). Env override
+  `ICON_SETS_DIR`, default `/var/lib/void/icon-sets`.
+- A "set" is a directory of icon files. Set/name validated `^[a-z0-9-]+$`.
+- **Three ingest methods**, all converging on the same per-file processor:
+  1. **Multi-file** — one or more SVG/PNG files.
+  2. **Zip archive** — server unpacks; each entry runs the per-file processor.
+     Reject path traversal / absolute paths / nested dirs (flatten basenames);
+     skip non-image entries; cap entry count + uncompressed total (zip-bomb
+     guard).
+  3. **URL ingest** — server fetches a remote URL; if the payload is a zip it is
+     unpacked (as above), otherwise treated as a single image. http/https only
+     (scheme allowlist, SSRF guard), 8 s timeout, total size cap.
+- **Per-file processor (shared):** validate name slug + extension; magic-byte
+  check (PNG/JPEG/SVG); **sanitize SVGs** (strip `<script>`, `on*` handlers,
+  external refs — uploaded SVGs render inline → XSS risk even behind CF Access);
+  enforce per-file size cap (e.g. 256 KB); write into the set dir.
+
+### 4. API (`lib/api/routes/`)
+- `GET  /api/icon-sets` → `[{ set, readonly, icons:[name…] }]` (bundled `devices`
+  scanned from `public/icons/devices`, uploads scanned from ICON_SETS_DIR).
+- `GET  /api/icon-sets/:set/:file` → serve the icon (correct Content-Type;
+  Cache-Control). Validates slugs; 404 on miss.
+- `POST /api/icon-sets/:set` (requireOwner) → create/extend a set. Accepts
+  EITHER multipart files (one or more SVG/PNG, and/or a `.zip`) OR a JSON body
+  `{ url }` for URL ingest. All inputs run through the shared per-file processor
+  (§3). Returns the updated set. SSRF guard + size/timeout caps on URL ingest.
+- `DELETE /api/icon-sets/:set` (requireOwner) → remove an uploaded set; the
+  bundled `devices` set is read-only (409).
+- Extend `patchBody` in `devices.js` with
+  `icon: z.string().regex(/^(set:[a-z0-9-]+:[a-z0-9-]+|brand:[a-z0-9-]+)$/).nullable().optional()`.
+- Ensure `GET /api/devices` returns `icon` and `last_seen`.
+
+### 5. Frontend — `devices_band.js`
+- `resolveIcon(iconRef)` (pure): `set:` → `/api/icon-sets/<set>/<name>`;
+  `brand:` → `/api/icons/<slug>.png`; null → auto-default → `set:devices:<name>`.
+  `<img>` with the existing letter fallback on error.
+- Tile shows the icon. Edit (✎) mode gains an **icon picker** with two tabs:
+  - **Type**: grid grouped by set (bundled `devices` first, then uploads),
+    fetched from `GET /api/icon-sets`.
+  - **Brand**: a search box → live preview from `/api/icons/<slug>.png`.
+  Selecting writes `icon` via the existing PATCH.
+- `relativeTime(ts)` (pure): <60s "just now"; <60m "Nm ago"; <24h "Nh ago";
+  else "Nd ago". Shown as "seen Nh ago" on **absent** tiles only (present tiles
+  keep the online dot).
+
+### 6. Settings — expandable "Icon sets" section
+- Collapsible panel (`public/views/settings*` pattern): lists each set as a grid
+  of its icons; uploaded sets get a Delete; bundled `devices` is read-only.
+- Upload control: a set-name field plus three inputs → `POST /api/icon-sets/:set`,
+  refresh the list on success:
+  - multi-file picker (SVG/PNG),
+  - zip picker (`.zip`),
+  - a URL field ("ingest from URL" — image or zip).
+
+## Testing (vitest)
+Pure/unit: `resolveIcon`, `relativeTime`, auto-default mapping, SVG sanitizer,
+slug validation, `patchBody` icon regex, zip-entry guard (traversal/zip-bomb),
+URL SSRF/scheme guard. Integration: icon-sets list/upload/delete (tmp dir via
+env override), multi-file + zip + URL ingest (mock fetcher) all landing files,
+devices PATCH accepts/round-trips `icon`, GET returns icon+last_seen. Reuse the
+existing icon-proxy test patterns.
+
+## Deploy
+Per backup-before-major-updates: `pct snapshot` void-db (310) + void-app (311),
+run the migration, deploy via the health-gated script, headless-render the
+Devices band + Settings panel to confirm icons + picker + last-seen display.
+Ensure ICON_SETS_DIR exists + is writable by the `void` user; document the env
+var. Commit + push to Gitea `Hynes/Void-Homelab`; wiki page update.
+
+## Out of scope (YAGNI)
+Per-icon recolor/theming, auto-icon-by-vendor guessing beyond the group default,
+icon sets shared across other Void features, scraping a whole remote icon-pack
+repo (URL ingest is single-file or single-zip, not a directory crawl).