Merge pull request 'v1.3.1' (#39) from dev into main

Reviewed-on: #39

.gitea/workflows/release.yml

@@ -20,7 +20,6 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           node-version: 'lts/*'
-          cache: npm
 
       - run: npm ci
       - run: npm test
@@ -48,12 +47,10 @@ jobs:
         run: |
           LAST_TAG=$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || echo "")
           if [ -n "$LAST_TAG" ]; then
-            NOTES=$(git log "${LAST_TAG}..HEAD" --pretty=format:"- %s" --no-merges)
+            git log "${LAST_TAG}..HEAD" --pretty=format:"- %s" --no-merges > /tmp/release_notes.txt
           else
-            NOTES=$(git log --pretty=format:"- %s" --no-merges)
+            git log --pretty=format:"- %s" --no-merges > /tmp/release_notes.txt
           fi
-          NOTES_JSON=$(printf '%s' "$NOTES" | python3 -c "import sys,json; print(json.dumps(sys.stdin.read()))")
-          echo "NOTES=${NOTES_JSON}" >> $GITEA_ENV
 
       - name: Docker metadata
         id: meta
@@ -82,14 +79,31 @@ jobs:
 
       - name: Create Gitea release
         run: |
+          cat > /tmp/make_release.py << 'PYEOF'
+          import json, os
+          v   = os.environ['VERSION']
+          img = os.environ['IMAGE']
+          raw = open('/tmp/release_notes.txt').read().strip()
+          feats, fixes = [], []
+          for line in raw.splitlines():
+              msg = line.lstrip('- ').strip()
+              if msg.startswith('feat:'):
+                  feats.append('- ' + msg[5:].strip())
+              elif msg.startswith('fix:'):
+                  fixes.append('- ' + msg[4:].strip())
+          sections = []
+          if feats:
+              sections.append('### New Features\n\n' + '\n'.join(feats))
+          if fixes:
+              sections.append('### Bug Fixes\n\n' + '\n'.join(fixes))
+          notes = '\n\n'.join(sections) or '_No changes_'
+          body  = notes + '\n\n### Image\n\n' + img + ':' + v
+          payload = {'tag_name': 'v'+v, 'name': 'Catalyst v'+v, 'body': body, 'draft': False, 'prerelease': False}
+          open('/tmp/release_body.json', 'w').write(json.dumps(payload))
+          PYEOF
+          python3 /tmp/make_release.py
           curl -sf -X POST \
             -H "Authorization: token ${{ secrets.TOKEN }}" \
             -H "Content-Type: application/json" \
             "${{ gitea.server_url }}/api/v1/repos/${{ gitea.repository }}/releases" \
-            -d "{
-              \"tag_name\": \"v${{ env.VERSION }}\",
-              \"name\": \"Catalyst v${{ env.VERSION }}\",
-              \"body\": \"### Changes\n\n${{ env.NOTES }}\n\n### Image\n\n\`${{ env.IMAGE }}:${{ env.VERSION }}\`\",
-              \"draft\": false,
-              \"prerelease\": false
-            }"
+            --data @/tmp/release_body.json

.gitignore

@@ -1,5 +1,4 @@
 node_modules/
-js/version.js
 data/*.db
 data/*.db-shm
 data/*.db-wal

README.md

@@ -1,39 +1,38 @@
 # Catalyst
 
-A self-hosted infrastructure registry. Track every VM, container, and service across your homelab — their state, stack, and which internal services are running on them.
+A self-hosted infrastructure registry for homelab Proxmox environments. Track virtual machines across stacks, monitor service health, and maintain a full audit log of every configuration change.
 
 ---
 
 ## Features
 
 - **Dashboard** — filterable, searchable instance list with state and stack badges
-- **Detail pages** — per-instance view with service flags, Tailscale IP, and timestamps
+- **Detail pages** — per-instance view with service flags, Tailscale IP, and a full change timeline
+- **Audit log** — every field change is recorded with before/after values and a timestamp
 - **Full CRUD** — add, edit, and delete instances via a clean modal interface
 - **Production safeguard** — only development instances can be deleted; production instances must be demoted first
-- **REST API** — every operation is a plain HTTP call; no magic, no framework lock-in
-- **Persistent storage** — SQLite database on a Docker named volume; survives restarts and upgrades
-- **Zero native dependencies** — SQLite via Node's built-in `node:sqlite`. No compilation, no binaries.
+- **Export / import** — JSON backup and restore via the settings modal
+- **REST API** — every operation is a plain HTTP call
+- **Persistent storage** — SQLite on a Docker named volume; survives restarts and upgrades
+- **Zero native dependencies** — SQLite via Node's built-in `node:sqlite`; no compilation, no binaries
 
 ---
 
 ## Quick start
 
-```bash
-docker run -d \
-  --name catalyst \
-  -p 3000:3000 \
-  -v catalyst-data:/app/data \
-  gitea.thewrightserver.net/josh/catalyst:latest
-```
-
-Or with the included Compose file:
-
 ```bash
 docker compose up -d
 ```
 
 Open [http://localhost:3000](http://localhost:3000).
 
+### Environment variables
+
+| Variable | Default | Description |
+|---|---|---|
+| `PORT` | `3000` | HTTP port the server binds to |
+| `DB_PATH` | `data/catalyst.db` | Path to the SQLite database file |
+
 ---
 
 ## REST API
@@ -44,11 +43,11 @@ All endpoints are under `/api`. Request and response bodies are JSON.
 
 #### `GET /api/instances`
 
-Returns all instances, sorted by name. All query parameters are optional.
+Returns all instances sorted by name. All query parameters are optional.
 
 | Parameter | Type | Description |
-|-----------|--------|-----------------------------------------|
-| `search`  | string | Partial match on `name` or `vmid`       |
+|---|---|---|
+| `search` | string | Partial match on `name`, `vmid`, or `stack` |
 | `state` | string | Exact match: `deployed`, `testing`, `degraded` |
 | `stack` | string | Exact match: `production`, `development` |
 
@@ -64,11 +63,11 @@ GET /api/instances?search=plex&state=deployed
     "state": "deployed",
     "stack": "production",
     "tailscale_ip": "100.64.0.1",
-    "atlas": 1, "argus": 0, "semaphore": 0,
+    "atlas": 1, "argus": 1, "semaphore": 0,
     "patchmon": 1, "tailscale": 1, "andromeda": 0,
     "hardware_acceleration": 1,
-    "created_at": "2024-01-15T10:30:00.000Z",
-    "updated_at": "2024-03-10T14:22:00.000Z"
+    "created_at": "2024-01-15T10:30:00",
+    "updated_at": "2024-03-10T14:22:00"
   }
 ]
 ```
@@ -91,10 +90,43 @@ GET /api/instances/stacks
 Returns a single instance by VMID.
 
 | Status | Condition |
-|--------|-----------|
+|---|---|
 | `200` | Instance found |
-| `404`  | No instance with that VMID |
 | `400` | VMID is not a valid integer |
+| `404` | No instance with that VMID |
+
+---
+
+#### `GET /api/instances/:vmid/history`
+
+Returns the audit log for an instance — newest events first.
+
+| Status | Condition |
+|---|---|
+| `200` | History returned (may be empty array) |
+| `400` | VMID is not a valid integer |
+| `404` | No instance with that VMID |
+
+```json
+[
+  {
+    "id": 3,
+    "vmid": 117,
+    "field": "state",
+    "old_value": "testing",
+    "new_value": "deployed",
+    "changed_at": "2024-03-10T14:22:00"
+  },
+  {
+    "id": 1,
+    "vmid": 117,
+    "field": "created",
+    "old_value": null,
+    "new_value": null,
+    "changed_at": "2024-01-15T10:30:00"
+  }
+]
+```
 
 ---
 
@@ -103,21 +135,21 @@ Returns a single instance by VMID.
 Creates a new instance. Returns the created record.
 
 | Status | Condition |
-|--------|-----------|
+|---|---|
 | `201` | Created successfully |
-| `400`  | Validation error (see `errors` array in response) |
+| `400` | Validation error — see `errors` array in response |
 | `409` | VMID already exists |
 
 **Request body:**
 
 | Field | Type | Required | Notes |
-|-------|------|----------|-------|
+|---|---|---|---|
 | `name` | string | yes | |
-| `vmid` | integer | yes | Must be > 0, unique |
+| `vmid` | integer | yes | Must be > 0 and unique |
 | `state` | string | yes | `deployed`, `testing`, or `degraded` |
 | `stack` | string | yes | `production` or `development` |
-| `tailscale_ip` | string | no | Defaults to `""` |
-| `atlas` | 0\|1 | no | Defaults to `0` |
+| `tailscale_ip` | string | no | Valid IPv4 or empty string |
+| `atlas` | 0\|1 | no | |
 | `argus` | 0\|1 | no | |
 | `semaphore` | 0\|1 | no | |
 | `patchmon` | 0\|1 | no | |
@@ -132,7 +164,7 @@ Creates a new instance. Returns the created record.
 Replaces all fields on an existing instance. Accepts the same body shape as `POST`. The `vmid` in the body may differ from the URL — this is how you change a VMID.
 
 | Status | Condition |
-|--------|-----------|
+|---|---|
 | `200` | Updated successfully |
 | `400` | Validation error |
 | `404` | No instance with that VMID |
@@ -145,11 +177,36 @@ Replaces all fields on an existing instance. Accepts the same body shape as `POS
 Deletes an instance. Only instances on the `development` stack may be deleted.
 
 | Status | Condition |
-|--------|-----------|
+|---|---|
 | `204` | Deleted successfully |
+| `400` | VMID is not a valid integer |
 | `404` | No instance with that VMID |
 | `422` | Instance is on the `production` stack |
-| `400`  | VMID is not a valid integer |
+
+---
+
+### Backup
+
+#### `GET /api/export`
+
+Downloads a JSON backup of all instances as a file attachment.
+
+```json
+{
+  "version": 1,
+  "exported_at": "2024-03-10T14:22:00.000Z",
+  "instances": [ ... ]
+}
+```
+
+#### `POST /api/import`
+
+Replaces all instances from a JSON backup. Validates every row before committing — if any row is invalid the entire import is rejected.
+
+| Status | Condition |
+|---|---|
+| `200` | Import successful — returns `{ "imported": N }` |
+| `400` | Body missing `instances` array, or validation errors |
 
 ---
 
@@ -165,34 +222,22 @@ npm start         # start the server on :3000
 Tests are split across three files:
 
 | File | What it covers |
-|------|----------------|
-| `tests/db.test.js` | SQLite data layer — all CRUD operations, constraints, filters |
+|---|---|
+| `tests/db.test.js` | SQLite data layer — CRUD, constraints, filters, history logging |
 | `tests/api.test.js` | HTTP API — all endpoints, status codes, error cases |
-| `tests/helpers.test.js` | UI helper functions — `esc()` XSS contract, `fmtDate()` |
+| `tests/helpers.test.js` | UI helpers — `esc()` XSS contract, date formatting, history formatters |
 
 ---
 
 ## Versioning
 
-Catalyst uses [semantic versioning](https://semver.org). `package.json` is the single source of truth for the version number.
+Catalyst uses [semantic versioning](https://semver.org). `package.json` is the single source of truth.
 
-| Change | Bump | Example |
-|--------|------|---------|
-| Bug fix | patch | `1.0.0` → `1.0.1` |
-| New feature, backward compatible | minor | `1.0.0` → `1.1.0` |
-| Breaking change | major | `1.0.0` → `2.0.0` |
+| Change | Bump |
+|---|---|
+| Bug fix | patch |
+| New feature, backward compatible | minor |
+| Breaking change | major |
 
-### Cutting a release
-
-```bash
-# 1. Bump version in package.json, then:
-git add package.json
-git commit -m "chore: release v1.1.0"
-git tag v1.1.0
-git push && git push --tags
-```
-
-Pushing a tag triggers the full CI pipeline: **test → build → release**.
-
-- Docker image tagged `:1.1.0`, `:1.1`, and `:latest` in the Gitea registry
-- A Gitea release is created at `v1.1.0`
+Pushing a tag triggers the CI pipeline: **test → build → release**.
+Docker images are tagged `:x.y.z`, `:x.y`, and `:latest`.

css/app.css

@@ -25,6 +25,10 @@
   --mono: 'JetBrains Mono', 'IBM Plex Mono', monospace;
 }
 
+html {
+  zoom: 1.1;
+}
+
 html, body {
   height: 100%;
   background: var(--bg);
@@ -70,6 +74,19 @@ nav {
 
 .nav-sep { flex: 1; }
 
+.nav-btn {
+  background: none;
+  border: 1px solid var(--border2);
+  color: var(--text2);
+  border-radius: 6px;
+  padding: 4px 8px;
+  font-size: 14px;
+  cursor: pointer;
+  margin-left: 10px;
+  line-height: 1;
+}
+.nav-btn:hover { border-color: var(--accent); color: var(--accent); }
+
 .nav-divider { color: var(--border2); }
 
 .nav-status {
@@ -361,16 +378,25 @@ select:focus { border-color: var(--accent); }
 }
 
 .detail-sub {
-  font-size: 12px;
-  color: var(--text3);
-  margin-top: 6px;
+  font-size: 13px;
+  margin-top: 8px;
   display: flex;
-  gap: 16px;
+  align-items: center;
+  gap: 0;
 }
 
-.detail-sub span { display: flex; gap: 4px; }
-.detail-sub .lbl { color: var(--text3); }
-.detail-sub .val { color: var(--text2); }
+.detail-sub > span {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+}
+.detail-sub > span + span {
+  margin-left: 12px;
+  padding-left: 12px;
+  border-left: 1px solid var(--border);
+}
+.detail-sub .lbl { color: var(--text3); font-size: 11px; }
+.detail-sub .val { color: var(--text); }
 
 .detail-actions { display: flex; gap: 8px; }
 
@@ -615,6 +641,58 @@ select:focus { border-color: var(--accent); }
 
 .confirm-actions { display: flex; justify-content: flex-end; gap: 10px; }
 
+/* ── HISTORY TIMELINE ── */
+.tl-item {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 24px;
+  padding: 9px 0;
+  border-bottom: 1px solid var(--border);
+}
+.tl-item:last-child { border-bottom: none; }
+.tl-event  { display: flex; align-items: center; gap: 7px; font-size: 13px; min-width: 0; }
+.tl-label  { color: var(--text2); }
+.tl-sep    { color: var(--text3); user-select: none; }
+.tl-old    { color: var(--text3); text-decoration: line-through; font-size: 12px; }
+.tl-arrow  { color: var(--text3); font-size: 11px; }
+.tl-new    { color: var(--text); font-weight: 500; }
+.tl-time   { color: var(--text3); font-size: 11px; white-space: nowrap; flex-shrink: 0; }
+.tl-deployed { color: var(--accent); }
+.tl-testing  { color: var(--amber); }
+.tl-degraded { color: var(--red); }
+.tl-created .tl-event { color: var(--accent); font-weight: 500; }
+.tl-empty  { color: var(--text3); font-size: 12px; padding: 8px 0; }
+
+/* ── SETTINGS MODAL ── */
+#settings-modal .modal-body { padding-top: 0; }
+.settings-section { padding: 16px 0; border-bottom: 1px solid var(--border); }
+.settings-section:last-child { border-bottom: none; padding-bottom: 0; }
+.settings-section-title {
+  font-size: 10px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.1em;
+  color: var(--text3);
+  margin-bottom: 8px;
+}
+.settings-desc { font-size: 12px; color: var(--text2); margin: 0 0 14px; line-height: 1.6; }
+.settings-row { display: flex; align-items: center; gap: 12px; }
+.settings-label { font-size: 13px; color: var(--text2); white-space: nowrap; min-width: 80px; }
+.settings-select { flex: 1; }
+.import-row { display: flex; gap: 10px; align-items: center; }
+.import-file-input { flex: 1; }
+
+.btn-secondary {
+  background: var(--bg3);
+  border-color: var(--border2);
+  color: var(--text);
+}
+.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
+
+.btn-danger { background: var(--red2); border-color: var(--red); color: var(--text); }
+.btn-danger:hover { background: var(--red); }
+
 /* ── SCROLLBAR ── */
 ::-webkit-scrollbar       { width: 6px; }
 ::-webkit-scrollbar-track { background: var(--bg); }

index.html

@@ -22,6 +22,7 @@
       <span class="nav-divider">·</span>
       <span id="nav-version"></span>
     </div>
+    <button class="nav-btn" onclick="openSettingsModal()" title="Settings">&#9881;</button>
   </nav>
 
   <main>
@@ -91,7 +92,7 @@
             <div class="services-grid" id="detail-services"></div>
           </div>
           <div class="detail-section full">
-            <div class="section-title">timestamps</div>
+            <div class="section-title">history</div>
             <div id="detail-timestamps"></div>
           </div>
         </div>
@@ -171,6 +172,38 @@
   </div>
 </div>
 
+<!-- SETTINGS MODAL -->
+<div id="settings-modal" class="modal-overlay">
+  <div class="modal">
+    <div class="modal-header">
+      <span class="modal-title">Settings</span>
+      <button class="modal-close" onclick="closeSettingsModal()">&#x2715;</button>
+    </div>
+    <div class="modal-body">
+      <div class="settings-section">
+        <div class="settings-section-title">Display</div>
+        <div class="settings-row">
+          <label class="settings-label" for="tz-select">Timezone</label>
+          <select id="tz-select" class="form-input settings-select"></select>
+        </div>
+      </div>
+      <div class="settings-section">
+        <div class="settings-section-title">Export</div>
+        <p class="settings-desc">Download all instance data as a JSON backup file.</p>
+        <button class="btn btn-secondary" onclick="exportDB()">Export Database</button>
+      </div>
+      <div class="settings-section">
+        <div class="settings-section-title">Import</div>
+        <p class="settings-desc">Restore from a backup file. This replaces all current instances.</p>
+        <div class="import-row">
+          <input type="file" id="import-file" accept=".json" class="form-input import-file-input">
+          <button class="btn btn-danger" onclick="importDB()">Import</button>
+        </div>
+      </div>
+    </div>
+  </div>
+</div>
+
 <!-- TOAST -->
 <div class="toast" id="toast">
   <div class="toast-dot"></div>

js/db.js

@@ -55,3 +55,8 @@ async function updateInstance(vmid, data) {
 async function deleteInstance(vmid) {
   await api(`/instances/${vmid}`, { method: 'DELETE' });
 }
+
+async function getInstanceHistory(vmid) {
+  const res = await fetch(`${BASE}/instances/${vmid}/history`);
+  return res.json();
+}

js/ui.js

@@ -3,6 +3,34 @@ let editingVmid = null;
 let currentVmid = null;
 let toastTimer  = null;
 
+// ── Timezone ──────────────────────────────────────────────────────────────────
+
+const TIMEZONES = [
+  { label: 'UTC',                      tz: 'UTC' },
+  { label: 'Hawaii (HST)',             tz: 'Pacific/Honolulu' },
+  { label: 'Alaska (AKT)',             tz: 'America/Anchorage' },
+  { label: 'Pacific (PT)',             tz: 'America/Los_Angeles' },
+  { label: 'Mountain (MT)',            tz: 'America/Denver' },
+  { label: 'Central (CT)',             tz: 'America/Chicago' },
+  { label: 'Eastern (ET)',             tz: 'America/New_York' },
+  { label: 'Atlantic (AT)',            tz: 'America/Halifax' },
+  { label: 'London (GMT/BST)',         tz: 'Europe/London' },
+  { label: 'Paris / Berlin (CET)',     tz: 'Europe/Paris' },
+  { label: 'Helsinki (EET)',           tz: 'Europe/Helsinki' },
+  { label: 'Istanbul (TRT)',           tz: 'Europe/Istanbul' },
+  { label: 'Dubai (GST)',              tz: 'Asia/Dubai' },
+  { label: 'India (IST)',              tz: 'Asia/Kolkata' },
+  { label: 'Singapore (SGT)',          tz: 'Asia/Singapore' },
+  { label: 'China (CST)',              tz: 'Asia/Shanghai' },
+  { label: 'Japan / Korea (JST/KST)', tz: 'Asia/Tokyo' },
+  { label: 'Sydney (AEST)',            tz: 'Australia/Sydney' },
+  { label: 'Auckland (NZST)',          tz: 'Pacific/Auckland' },
+];
+
+function getTimezone() {
+  return localStorage.getItem('catalyst_tz') || 'UTC';
+}
+
 // ── Helpers ───────────────────────────────────────────────────────────────────
 
 function esc(str) {
@@ -11,17 +39,25 @@ function esc(str) {
   return d.innerHTML;
 }
 
+// SQLite datetime('now') → 'YYYY-MM-DD HH:MM:SS' (UTC, no timezone marker).
+// Appending 'Z' tells JS to parse it as UTC rather than local time.
+function parseUtc(d) {
+  if (typeof d !== 'string') return new Date(d);
+  const hasZone = d.endsWith('Z') || /[+-]\d{2}:\d{2}$/.test(d);
+  return new Date(hasZone ? d : d.replace(' ', 'T') + 'Z');
+}
+
 function fmtDate(d) {
   if (!d) return '—';
   try {
-    return new Date(d).toLocaleDateString('en-US', { year: 'numeric', month: 'short', day: 'numeric' });
+    return parseUtc(d).toLocaleDateString('en-US', { year: 'numeric', month: 'short', day: 'numeric', timeZone: getTimezone() });
   } catch (e) { return d; }
 }
 
 function fmtDateFull(d) {
   if (!d) return '—';
   try {
-    return new Date(d).toLocaleString('en-US', { year: 'numeric', month: 'short', day: 'numeric', hour: '2-digit', minute: '2-digit' });
+    return parseUtc(d).toLocaleString('en-US', { year: 'numeric', month: 'short', day: 'numeric', hour: '2-digit', minute: '2-digit', timeZone: getTimezone(), timeZoneName: 'short' });
   } catch (e) { return d; }
 }
 
@@ -39,7 +75,6 @@ async function renderDashboard() {
     <div class="stat-cell"><div class="stat-label">deployed</div><div class="stat-value">${states['deployed'] || 0}</div></div>
     <div class="stat-cell"><div class="stat-label">testing</div><div class="stat-value amber">${states['testing'] || 0}</div></div>
     <div class="stat-cell"><div class="stat-label">degraded</div><div class="stat-value red">${states['degraded'] || 0}</div></div>
-    <div class="stat-cell"><div class="stat-label">stacks</div><div class="stat-value">${(await getDistinctStacks()).length}</div></div>
   `;
 
   await populateStackFilter();
@@ -100,10 +135,39 @@ async function filterInstances() {
 
 // ── Detail Page ───────────────────────────────────────────────────────────────
 
+const BOOL_FIELDS = ['atlas','argus','semaphore','patchmon','tailscale','andromeda','hardware_acceleration'];
+
+const FIELD_LABELS = {
+  name:                  'name',
+  state:                 'state',
+  stack:                 'stack',
+  vmid:                  'vmid',
+  tailscale_ip:          'tailscale ip',
+  atlas:                 'atlas',
+  argus:                 'argus',
+  semaphore:             'semaphore',
+  patchmon:              'patchmon',
+  tailscale:             'tailscale',
+  andromeda:             'andromeda',
+  hardware_acceleration: 'hw acceleration',
+};
+
+function stateClass(field, val) {
+  if (field !== 'state') return '';
+  return { deployed: 'tl-deployed', testing: 'tl-testing', degraded: 'tl-degraded' }[val] ?? '';
+}
+
+function fmtHistVal(field, val) {
+  if (val == null || val === '') return '—';
+  if (BOOL_FIELDS.includes(field)) return val === '1' ? 'on' : 'off';
+  return esc(val);
+}
+
 async function renderDetailPage(vmid) {
-  const inst = await getInstance(vmid);
+  const [inst, history, all] = await Promise.all([getInstance(vmid), getInstanceHistory(vmid), getInstances()]);
   if (!inst) { navigate('dashboard'); return; }
   currentVmid = vmid;
+  document.getElementById('nav-count').textContent = `${all.length} instance${all.length !== 1 ? 's' : ''}`;
 
   document.getElementById('detail-vmid-crumb').textContent  = vmid;
   document.getElementById('detail-name').textContent        = inst.name;
@@ -114,7 +178,7 @@ async function renderDetailPage(vmid) {
   document.getElementById('detail-identity').innerHTML = `
     <div class="kv-row"><span class="kv-key">name</span><span class="kv-val highlight">${esc(inst.name)}</span></div>
     <div class="kv-row"><span class="kv-key">state</span><span class="kv-val"><span class="badge ${esc(inst.state)}">${esc(inst.state)}</span></span></div>
-    <div class="kv-row"><span class="kv-key">stack</span><span class="kv-val highlight">${esc(inst.stack) || '—'}</span></div>
+    <div class="kv-row"><span class="kv-key">stack</span><span class="kv-val"><span class="badge ${esc(inst.stack)}">${esc(inst.stack) || '—'}</span></span></div>
     <div class="kv-row"><span class="kv-key">vmid</span><span class="kv-val highlight">${inst.vmid}</span></div>
     <div class="kv-row"><span class="kv-key">internal id</span><span class="kv-val">${inst.id}</span></div>
   `;
@@ -134,10 +198,30 @@ async function renderDetailPage(vmid) {
     </div>
   `).join('');
 
-  document.getElementById('detail-timestamps').innerHTML = `
-    <div class="kv-row"><span class="kv-key">created</span><span class="kv-val">${fmtDateFull(inst.created_at)}</span></div>
-    <div class="kv-row"><span class="kv-key">updated</span><span class="kv-val">${fmtDateFull(inst.updated_at)}</span></div>
-  `;
+  document.getElementById('detail-timestamps').innerHTML = history.length
+    ? history.map(e => {
+        if (e.field === 'created') return `
+          <div class="tl-item tl-created">
+            <span class="tl-event">instance created</span>
+            <span class="tl-time">${fmtDateFull(e.changed_at)}</span>
+          </div>`;
+        const label = FIELD_LABELS[e.field] ?? esc(e.field);
+        const newCls = (e.field === 'state' || e.field === 'stack')
+          ? `badge ${esc(e.new_value)}`
+          : `tl-new ${stateClass(e.field, e.new_value)}`;
+        return `
+          <div class="tl-item">
+            <div class="tl-event">
+              <span class="tl-label">${label}</span>
+              <span class="tl-sep">·</span>
+              <span class="tl-old">${fmtHistVal(e.field, e.old_value)}</span>
+              <span class="tl-arrow">→</span>
+              <span class="${newCls}">${fmtHistVal(e.field, e.new_value)}</span>
+            </div>
+            <span class="tl-time">${fmtDateFull(e.changed_at)}</span>
+          </div>`;
+      }).join('')
+    : '<div class="tl-empty">no history yet</div>';
 
   document.getElementById('detail-edit-btn').onclick   = () => openEditModal(inst.vmid);
   document.getElementById('detail-delete-btn').onclick = () => confirmDeleteDialog(inst);
@@ -258,12 +342,72 @@ function showToast(msg, type = 'success') {
   toastTimer = setTimeout(() => t.classList.remove('show'), 3000);
 }
 
+// ── Settings Modal ────────────────────────────────────────────────────────────
+
+function openSettingsModal() {
+  const sel = document.getElementById('tz-select');
+  if (!sel.options.length) {
+    for (const { label, tz } of TIMEZONES) {
+      const opt = document.createElement('option');
+      opt.value = tz;
+      opt.textContent = label;
+      sel.appendChild(opt);
+    }
+  }
+  sel.value = getTimezone();
+  document.getElementById('settings-modal').classList.add('open');
+}
+
+function closeSettingsModal() {
+  document.getElementById('settings-modal').classList.remove('open');
+  document.getElementById('import-file').value = '';
+}
+
+async function exportDB() {
+  const res = await fetch('/api/export');
+  const blob = await res.blob();
+  const url = URL.createObjectURL(blob);
+  const a = document.createElement('a');
+  a.href = url;
+  a.download = `catalyst-backup-${new Date().toISOString().slice(0, 10)}.json`;
+  a.click();
+  URL.revokeObjectURL(url);
+}
+
+async function importDB() {
+  const file = document.getElementById('import-file').files[0];
+  if (!file) { showToast('Select a backup file first', 'error'); return; }
+  document.getElementById('confirm-title').textContent = 'Replace all instances?';
+  document.getElementById('confirm-msg').textContent =
+    `This will delete all current instances and replace them with the contents of "${file.name}". This cannot be undone.`;
+  document.getElementById('confirm-overlay').classList.add('open');
+  document.getElementById('confirm-ok').onclick = async () => {
+    closeConfirm();
+    try {
+      const { instances } = JSON.parse(await file.text());
+      const res = await fetch('/api/import', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ instances }),
+      });
+      const data = await res.json();
+      if (!res.ok) { showToast(data.error ?? 'Import failed', 'error'); return; }
+      showToast(`Imported ${data.imported} instance${data.imported !== 1 ? 's' : ''}`, 'success');
+      closeSettingsModal();
+      renderDashboard();
+    } catch {
+      showToast('Invalid backup file', 'error');
+    }
+  };
+}
+
 // ── Keyboard / backdrop ───────────────────────────────────────────────────────
 
 document.addEventListener('keydown', e => {
   if (e.key !== 'Escape') return;
   if (document.getElementById('instance-modal').classList.contains('open'))  { closeModal();         return; }
   if (document.getElementById('confirm-overlay').classList.contains('open')) { closeConfirm();       return; }
+  if (document.getElementById('settings-modal').classList.contains('open'))  { closeSettingsModal(); return; }
 });
 
 document.getElementById('instance-modal').addEventListener('click', e => {
@@ -272,3 +416,13 @@ document.getElementById('instance-modal').addEventListener('click', e => {
 document.getElementById('confirm-overlay').addEventListener('click', e => {
   if (e.target === document.getElementById('confirm-overlay')) closeConfirm();
 });
+document.getElementById('settings-modal').addEventListener('click', e => {
+  if (e.target === document.getElementById('settings-modal')) closeSettingsModal();
+});
+
+document.getElementById('tz-select').addEventListener('change', e => {
+  localStorage.setItem('catalyst_tz', e.target.value);
+  const m = window.location.pathname.match(/^\/instance\/(\d+)/);
+  if (m) renderDetailPage(parseInt(m[1], 10));
+  else renderDashboard();
+});

js/version.js

@@ -0,0 +1 @@
+const VERSION = "1.3.1";

package.json

@@ -1,6 +1,6 @@
 {
   "name": "catalyst",
-  "version": "1.2.0",
+  "version": "1.3.1",
   "type": "module",
   "scripts": {
     "start": "node server/server.js",

server/db.js

@@ -43,6 +43,16 @@ function createSchema() {
     );
     CREATE INDEX IF NOT EXISTS idx_instances_state ON instances(state);
     CREATE INDEX IF NOT EXISTS idx_instances_stack ON instances(stack);
+
+    CREATE TABLE IF NOT EXISTS instance_history (
+      id         INTEGER PRIMARY KEY AUTOINCREMENT,
+      vmid       INTEGER NOT NULL,
+      field      TEXT    NOT NULL,
+      old_value  TEXT,
+      new_value  TEXT,
+      changed_at TEXT    NOT NULL DEFAULT (datetime('now'))
+    );
+    CREATE INDEX IF NOT EXISTS idx_history_vmid ON instance_history(vmid);
   `);
 }
 
@@ -99,8 +109,14 @@ export function getDistinctStacks() {
 
 // ── Mutations ─────────────────────────────────────────────────────────────────
 
+const HISTORY_FIELDS = [
+  'name', 'state', 'stack', 'vmid', 'tailscale_ip',
+  'atlas', 'argus', 'semaphore', 'patchmon', 'tailscale', 'andromeda',
+  'hardware_acceleration',
+];
+
 export function createInstance(data) {
-  return db.prepare(`
+  db.prepare(`
     INSERT INTO instances
       (name, state, stack, vmid, atlas, argus, semaphore, patchmon,
        tailscale, andromeda, tailscale_ip, hardware_acceleration)
@@ -108,10 +124,14 @@ export function createInstance(data) {
       (@name, @state, @stack, @vmid, @atlas, @argus, @semaphore, @patchmon,
        @tailscale, @andromeda, @tailscale_ip, @hardware_acceleration)
   `).run(data);
+  db.prepare(
+    `INSERT INTO instance_history (vmid, field, old_value, new_value) VALUES (?, 'created', NULL, NULL)`
+  ).run(data.vmid);
 }
 
 export function updateInstance(vmid, data) {
-  return db.prepare(`
+  const old = getInstance(vmid);
+  db.prepare(`
     UPDATE instances SET
       name=@name, state=@state, stack=@stack, vmid=@newVmid,
       atlas=@atlas, argus=@argus, semaphore=@semaphore, patchmon=@patchmon,
@@ -119,10 +139,42 @@ export function updateInstance(vmid, data) {
       hardware_acceleration=@hardware_acceleration, updated_at=datetime('now')
     WHERE vmid=@vmid
   `).run({ ...data, newVmid: data.vmid, vmid });
+  const newVmid = data.vmid;
+  const insertEvt = db.prepare(
+    `INSERT INTO instance_history (vmid, field, old_value, new_value) VALUES (?, ?, ?, ?)`
+  );
+  for (const field of HISTORY_FIELDS) {
+    const oldVal = String(old[field] ?? '');
+    const newVal = String(field === 'vmid' ? newVmid : (data[field] ?? ''));
+    if (oldVal !== newVal) insertEvt.run(newVmid, field, oldVal, newVal);
+  }
 }
 
 export function deleteInstance(vmid) {
-  return db.prepare('DELETE FROM instances WHERE vmid = ?').run(vmid);
+  db.prepare('DELETE FROM instance_history WHERE vmid = ?').run(vmid);
+  db.prepare('DELETE FROM instances WHERE vmid = ?').run(vmid);
+}
+
+export function importInstances(rows) {
+  db.exec('BEGIN');
+  db.exec('DELETE FROM instance_history');
+  db.exec('DELETE FROM instances');
+  const insert = db.prepare(`
+    INSERT INTO instances
+      (name, state, stack, vmid, atlas, argus, semaphore, patchmon,
+       tailscale, andromeda, tailscale_ip, hardware_acceleration)
+    VALUES
+      (@name, @state, @stack, @vmid, @atlas, @argus, @semaphore, @patchmon,
+       @tailscale, @andromeda, @tailscale_ip, @hardware_acceleration)
+  `);
+  for (const row of rows) insert.run(row);
+  db.exec('COMMIT');
+}
+
+export function getInstanceHistory(vmid) {
+  return db.prepare(
+    'SELECT * FROM instance_history WHERE vmid = ? ORDER BY changed_at DESC'
+  ).all(vmid);
 }
 
 // ── Test helpers ──────────────────────────────────────────────────────────────

server/routes.js

@@ -1,7 +1,7 @@
 import { Router } from 'express';
 import {
   getInstances, getInstance, getDistinctStacks,
-  createInstance, updateInstance, deleteInstance,
+  createInstance, updateInstance, deleteInstance, importInstances, getInstanceHistory,
 } from './db.js';
 
 export const router = Router();
@@ -28,9 +28,16 @@ function validate(body) {
   return errors;
 }
 
+function handleDbError(context, e, res) {
+  if (e.message.includes('UNIQUE')) return res.status(409).json({ error: 'vmid already exists' });
+  if (e.message.includes('CHECK'))  return res.status(400).json({ error: 'invalid field value' });
+  console.error(context, e);
+  res.status(500).json({ error: 'internal server error' });
+}
+
 function normalise(body) {
   const row = {
-    name:                  body.name.trim(),
+    name:                  (body.name ?? '').trim(),
     state:                 body.state,
     stack:                 body.stack,
     vmid:                  body.vmid,
@@ -54,6 +61,14 @@ router.get('/instances', (req, res) => {
   res.json(getInstances({ search, state, stack }));
 });
 
+// GET /api/instances/:vmid/history
+router.get('/instances/:vmid/history', (req, res) => {
+  const vmid = parseInt(req.params.vmid, 10);
+  if (!vmid) return res.status(400).json({ error: 'invalid vmid' });
+  if (!getInstance(vmid)) return res.status(404).json({ error: 'instance not found' });
+  res.json(getInstanceHistory(vmid));
+});
+
 // GET /api/instances/:vmid
 router.get('/instances/:vmid', (req, res) => {
   const vmid = parseInt(req.params.vmid, 10);
@@ -76,10 +91,7 @@ router.post('/instances', (req, res) => {
     const created = getInstance(data.vmid);
     res.status(201).json(created);
   } catch (e) {
-    if (e.message.includes('UNIQUE')) return res.status(409).json({ error: 'vmid already exists' });
-    if (e.message.includes('CHECK'))  return res.status(400).json({ error: 'invalid field value' });
-    console.error('POST /api/instances', e);
-    res.status(500).json({ error: 'internal server error' });
+    handleDbError('POST /api/instances', e, res);
   }
 });
 
@@ -97,9 +109,35 @@ router.put('/instances/:vmid', (req, res) => {
     updateInstance(vmid, data);
     res.json(getInstance(data.vmid));
   } catch (e) {
-    if (e.message.includes('UNIQUE')) return res.status(409).json({ error: 'vmid already exists' });
-    if (e.message.includes('CHECK'))  return res.status(400).json({ error: 'invalid field value' });
-    console.error('PUT /api/instances/:vmid', e);
+    handleDbError('PUT /api/instances/:vmid', e, res);
+  }
+});
+
+// GET /api/export
+router.get('/export', (_req, res) => {
+  const instances = getInstances();
+  const date = new Date().toISOString().slice(0, 10);
+  res.setHeader('Content-Disposition', `attachment; filename="catalyst-backup-${date}.json"`);
+  res.json({ version: 1, exported_at: new Date().toISOString(), instances });
+});
+
+// POST /api/import
+router.post('/import', (req, res) => {
+  const { instances } = req.body ?? {};
+  if (!Array.isArray(instances)) {
+    return res.status(400).json({ error: 'body must contain an instances array' });
+  }
+  const errors = [];
+  for (const [i, row] of instances.entries()) {
+    const errs = validate(normalise(row));
+    if (errs.length) errors.push({ index: i, errors: errs });
+  }
+  if (errors.length) return res.status(400).json({ errors });
+  try {
+    importInstances(instances.map(normalise));
+    res.json({ imported: instances.length });
+  } catch (e) {
+    console.error('POST /api/import', e);
     res.status(500).json({ error: 'internal server error' });
   }
 });
@@ -118,7 +156,6 @@ router.delete('/instances/:vmid', (req, res) => {
     deleteInstance(vmid);
     res.status(204).end();
   } catch (e) {
-    console.error('DELETE /api/instances/:vmid', e);
-    res.status(500).json({ error: 'internal server error' });
+    handleDbError('DELETE /api/instances/:vmid', e, res);
   }
 });

tests/api.test.js

@@ -239,6 +239,78 @@ describe('DELETE /api/instances/:vmid', () => {
   })
 })
 
+// ── GET /api/instances/:vmid/history ─────────────────────────────────────────
+
+describe('GET /api/instances/:vmid/history', () => {
+  it('returns history events for a known vmid', async () => {
+    await request(app).post('/api/instances').send(base)
+    const res = await request(app).get('/api/instances/100/history')
+    expect(res.status).toBe(200)
+    expect(res.body).toBeInstanceOf(Array)
+    expect(res.body[0].field).toBe('created')
+  })
+
+  it('returns 404 for unknown vmid', async () => {
+    expect((await request(app).get('/api/instances/999/history')).status).toBe(404)
+  })
+
+  it('returns 400 for non-numeric vmid', async () => {
+    expect((await request(app).get('/api/instances/abc/history')).status).toBe(400)
+  })
+})
+
+// ── GET /api/export ───────────────────────────────────────────────────────────
+
+describe('GET /api/export', () => {
+  it('returns 200 with instances array and attachment header', async () => {
+    await request(app).post('/api/instances').send(base)
+    const res = await request(app).get('/api/export')
+    expect(res.status).toBe(200)
+    expect(res.headers['content-disposition']).toMatch(/attachment/)
+    expect(res.body.instances).toHaveLength(1)
+    expect(res.body.instances[0].name).toBe('traefik')
+  })
+
+  it('returns empty instances array when no data', async () => {
+    const res = await request(app).get('/api/export')
+    expect(res.body.instances).toEqual([])
+  })
+})
+
+// ── POST /api/import ──────────────────────────────────────────────────────────
+
+describe('POST /api/import', () => {
+  it('replaces all instances and returns imported count', async () => {
+    await request(app).post('/api/instances').send(base)
+    const res = await request(app).post('/api/import')
+      .send({ instances: [{ ...base, vmid: 999, name: 'imported' }] })
+    expect(res.status).toBe(200)
+    expect(res.body.imported).toBe(1)
+    expect((await request(app).get('/api/instances')).body[0].name).toBe('imported')
+  })
+
+  it('returns 400 if instances is not an array', async () => {
+    expect((await request(app).post('/api/import').send({ instances: 'bad' })).status).toBe(400)
+  })
+
+  it('returns 400 with per-row errors for invalid rows', async () => {
+    const res = await request(app).post('/api/import')
+      .send({ instances: [{ ...base, name: '', vmid: 1 }] })
+    expect(res.status).toBe(400)
+    expect(res.body.errors[0].index).toBe(0)
+  })
+
+  it('returns 400 if body has no instances key', async () => {
+    expect((await request(app).post('/api/import').send({})).status).toBe(400)
+  })
+
+  it('returns 400 (not 500) when a row is missing name', async () => {
+    const res = await request(app).post('/api/import')
+      .send({ instances: [{ ...base, name: undefined, vmid: 1 }] })
+    expect(res.status).toBe(400)
+  })
+})
+
 // ── Static assets & SPA routing ───────────────────────────────────────────────
 
 describe('static assets and SPA routing', () => {

tests/db.test.js

@@ -2,7 +2,7 @@ import { describe, it, expect, beforeEach } from 'vitest'
 import {
   _resetForTest,
   getInstances, getInstance, getDistinctStacks,
-  createInstance, updateInstance, deleteInstance,
+  createInstance, updateInstance, deleteInstance, importInstances, getInstanceHistory,
 } from '../server/db.js'
 
 beforeEach(() => _resetForTest());
@@ -164,6 +164,81 @@ describe('deleteInstance', () => {
     expect(getInstance(1)).toBeNull();
     expect(getInstance(2)).not.toBeNull();
   });
+
+  it('clears history for the deleted instance', () => {
+    createInstance({ ...base, name: 'a', vmid: 1 });
+    deleteInstance(1);
+    expect(getInstanceHistory(1)).toHaveLength(0);
+  });
+
+  it('does not clear history for other instances', () => {
+    createInstance({ ...base, name: 'a', vmid: 1 });
+    createInstance({ ...base, name: 'b', vmid: 2 });
+    deleteInstance(1);
+    expect(getInstanceHistory(2).length).toBeGreaterThan(0);
+  });
+});
+
+// ── importInstances ───────────────────────────────────────────────────────────
+
+describe('importInstances', () => {
+  const base = { state: 'deployed', stack: 'production', atlas: 0, argus: 0, semaphore: 0, patchmon: 0, tailscale: 0, andromeda: 0, tailscale_ip: '', hardware_acceleration: 0 };
+
+  it('replaces all existing instances with the imported set', () => {
+    createInstance({ ...base, name: 'old', vmid: 1 });
+    importInstances([{ ...base, name: 'new', vmid: 2 }]);
+    expect(getInstance(1)).toBeNull();
+    expect(getInstance(2)).not.toBeNull();
+  });
+
+  it('clears all instances when passed an empty array', () => {
+    createInstance({ ...base, name: 'a', vmid: 1 });
+    importInstances([]);
+    expect(getInstances()).toEqual([]);
+  });
+
+  it('clears history for all replaced instances', () => {
+    createInstance({ ...base, name: 'old', vmid: 1 });
+    importInstances([{ ...base, name: 'new', vmid: 2 }]);
+    expect(getInstanceHistory(1)).toHaveLength(0);
+  });
+});
+
+// ── instance history ─────────────────────────────────────────────────────────
+
+describe('instance history', () => {
+  const base = { state: 'deployed', stack: 'production', atlas: 0, argus: 0, semaphore: 0, patchmon: 0, tailscale: 0, andromeda: 0, tailscale_ip: '', hardware_acceleration: 0 };
+
+  it('logs a created event when an instance is created', () => {
+    createInstance({ ...base, name: 'a', vmid: 1 });
+    const h = getInstanceHistory(1);
+    expect(h).toHaveLength(1);
+    expect(h[0].field).toBe('created');
+  });
+
+  it('logs changed fields when an instance is updated', () => {
+    createInstance({ ...base, name: 'a', vmid: 1 });
+    updateInstance(1, { ...base, name: 'a', vmid: 1, state: 'degraded' });
+    const h = getInstanceHistory(1);
+    const stateEvt = h.find(e => e.field === 'state');
+    expect(stateEvt).toBeDefined();
+    expect(stateEvt.old_value).toBe('deployed');
+    expect(stateEvt.new_value).toBe('degraded');
+  });
+
+  it('logs no events when nothing changes on update', () => {
+    createInstance({ ...base, name: 'a', vmid: 1 });
+    updateInstance(1, { ...base, name: 'a', vmid: 1 });
+    const h = getInstanceHistory(1).filter(e => e.field !== 'created');
+    expect(h).toHaveLength(0);
+  });
+
+  it('records history under the new vmid when vmid changes', () => {
+    createInstance({ ...base, name: 'a', vmid: 1 });
+    updateInstance(1, { ...base, name: 'a', vmid: 2 });
+    expect(getInstanceHistory(2).some(e => e.field === 'vmid')).toBe(true);
+    expect(getInstanceHistory(1).filter(e => e.field !== 'created')).toHaveLength(0);
+  });
 });
 
 // ── Test environment boot isolation ───────────────────────────────────────────

tests/helpers.test.js

@@ -58,16 +58,22 @@ describe('esc', () => {
 
 // ── fmtDate() ─────────────────────────────────────────────────────────────────
 
-function fmtDate(d) {
+function parseUtc(d) {
+  if (typeof d !== 'string') return new Date(d)
+  const hasZone = d.endsWith('Z') || /[+-]\d{2}:\d{2}$/.test(d)
+  return new Date(hasZone ? d : d.replace(' ', 'T') + 'Z')
+}
+
+function fmtDate(d, tz = 'UTC') {
   if (!d) return '—'
   try {
-    return new Date(d).toLocaleDateString('en-US', { year: 'numeric', month: 'short', day: 'numeric' })
+    return parseUtc(d).toLocaleDateString('en-US', { year: 'numeric', month: 'short', day: 'numeric', timeZone: tz })
   } catch (e) { return d }
 }
 
 describe('fmtDate', () => {
   it('formats a valid ISO date string', () => {
-    const result = fmtDate('2024-03-15T00:00:00')
+    const result = fmtDate('2024-03-15T12:00:00Z')
     expect(result).toMatch(/Mar/)
     expect(result).toMatch(/15/)
     expect(result).toMatch(/2024/)
@@ -88,24 +94,42 @@ describe('fmtDate', () => {
 
 // ── fmtDateFull() ─────────────────────────────────────────────────────────────
 
-function fmtDateFull(d) {
+function fmtDateFull(d, tz = 'UTC') {
   if (!d) return '—'
   try {
-    return new Date(d).toLocaleString('en-US', {
+    return parseUtc(d).toLocaleString('en-US', {
       year: 'numeric', month: 'short', day: 'numeric',
       hour: '2-digit', minute: '2-digit',
+      timeZone: tz, timeZoneName: 'short',
     })
   } catch (e) { return d }
 }
 
 describe('fmtDateFull', () => {
   it('includes date and time components', () => {
-    const result = fmtDateFull('2024-03-15T14:30:00')
+    const result = fmtDateFull('2024-03-15T14:30:00Z')
     expect(result).toMatch(/Mar/)
     expect(result).toMatch(/2024/)
     expect(result).toMatch(/\d{1,2}:\d{2}/)
   })
 
+  it('includes the timezone abbreviation', () => {
+    expect(fmtDateFull('2024-03-15T14:30:00Z', 'UTC')).toMatch(/UTC/)
+  })
+
+  it('converts to the given timezone', () => {
+    // 2024-03-15 18:30 UTC = 2024-03-15 14:30 EDT (UTC-4 in March)
+    const result = fmtDateFull('2024-03-15T18:30:00Z', 'America/New_York')
+    expect(result).toMatch(/2:30/)
+    expect(result).toMatch(/EDT/)
+  })
+
+  it('treats SQLite-format timestamps (space, no Z) as UTC', () => {
+    // SQLite datetime('now') → 'YYYY-MM-DD HH:MM:SS', no timezone marker.
+    // Must parse identically to the same moment expressed as ISO UTC.
+    expect(fmtDateFull('2024-03-15 18:30:00', 'UTC')).toBe(fmtDateFull('2024-03-15T18:30:00Z', 'UTC'))
+  })
+
   it('returns — for null', () => {
     expect(fmtDateFull(null)).toBe('—')
   })
@@ -133,6 +157,64 @@ describe('version label formatting', () => {
   })
 })
 
+// ── fmtHistVal() ─────────────────────────────────────────────────────────────
+// Mirrors the logic in ui.js — formats history field values for display.
+
+const BOOL_FIELDS = ['atlas','argus','semaphore','patchmon','tailscale','andromeda','hardware_acceleration']
+
+function fmtHistVal(field, val) {
+  if (val == null || val === '') return '—'
+  if (BOOL_FIELDS.includes(field)) return val === '1' ? 'on' : 'off'
+  return val
+}
+
+describe('fmtHistVal', () => {
+  it('returns — for null', () => {
+    expect(fmtHistVal('state', null)).toBe('—')
+  })
+
+  it('returns — for empty string', () => {
+    expect(fmtHistVal('state', '')).toBe('—')
+  })
+
+  it('returns on/off for boolean service fields', () => {
+    expect(fmtHistVal('atlas', '1')).toBe('on')
+    expect(fmtHistVal('atlas', '0')).toBe('off')
+    expect(fmtHistVal('hardware_acceleration', '1')).toBe('on')
+  })
+
+  it('returns the value as-is for non-boolean fields', () => {
+    expect(fmtHistVal('state', 'deployed')).toBe('deployed')
+    expect(fmtHistVal('name', 'plex')).toBe('plex')
+    expect(fmtHistVal('tailscale_ip', '100.64.0.1')).toBe('100.64.0.1')
+  })
+})
+
+// ── stateClass() ─────────────────────────────────────────────────────────────
+// Mirrors the logic in ui.js — maps state values to timeline CSS classes.
+
+function stateClass(field, val) {
+  if (field !== 'state') return ''
+  return { deployed: 'tl-deployed', testing: 'tl-testing', degraded: 'tl-degraded' }[val] ?? ''
+}
+
+describe('stateClass', () => {
+  it('returns empty string for non-state fields', () => {
+    expect(stateClass('name', 'plex')).toBe('')
+    expect(stateClass('stack', 'production')).toBe('')
+  })
+
+  it('returns the correct colour class for each state value', () => {
+    expect(stateClass('state', 'deployed')).toBe('tl-deployed')
+    expect(stateClass('state', 'testing')).toBe('tl-testing')
+    expect(stateClass('state', 'degraded')).toBe('tl-degraded')
+  })
+
+  it('returns empty string for unknown state values', () => {
+    expect(stateClass('state', 'unknown')).toBe('')
+  })
+})
+
 // ── CSS regressions ───────────────────────────────────────────────────────────
 
 const css = readFileSync(join(__dirname, '../css/app.css'), 'utf8')