Merge pull request 'feat: audit log / history timeline on instance detail page' (#22) from feat/history-timeline into dev

Reviewed-on: #22

.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 +79,9 @@ jobs:
 
       - name: Create Gitea release
         run: |
+          python3 -c "import json,os; v=os.environ['VERSION']; img=os.environ['IMAGE']; notes=open('/tmp/release_notes.txt').read(); open('/tmp/release_body.json','w').write(json.dumps({'tag_name':'v'+v,'name':'Catalyst v'+v,'body':'### Changes\n\n'+notes+'\n\n### Image\n\n'+img+':'+v,'draft':False,'prerelease':False}))"
           curl -sf -X POST \
             -H "Authorization: token ${{ secrets.TOKEN }}" \
             -H "Content-Type: application/json" \
             "${{ gitea.server_url }}/api/v1/repos/${{ gitea.repository }}/releases" \
-            -d "{
+            --data @/tmp/release_body.json
-              \"tag_name\": \"v${{ 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
-            }"

css/app.css

@@ -70,6 +70,19 @@ 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 {
@@ -615,6 +628,56 @@ select:focus { border-color: var(--accent); }
 
 .confirm-actions { display: flex; justify-content: flex-end; gap: 10px; }
 
+/* ── HISTORY TIMELINE ── */
+.tl-item {
+  display: grid;
+  grid-template-columns: 160px 140px 1fr;
+  gap: 0 12px;
+  padding: 7px 0;
+  border-bottom: 1px solid var(--border);
+  font-size: 12px;
+  align-items: baseline;
+}
+.tl-item:last-child { border-bottom: none; }
+.tl-time   { color: var(--text3); font-size: 11px; white-space: nowrap; }
+.tl-field  { color: var(--text2); }
+.tl-change { display: flex; align-items: baseline; gap: 6px; }
+.tl-old    { color: var(--text3); text-decoration: line-through; }
+.tl-arrow  { color: var(--text3); }
+.tl-new    { color: var(--text); }
+.tl-deployed { color: var(--accent); }
+.tl-testing  { color: var(--amber); }
+.tl-degraded { color: var(--red); }
+.tl-created .tl-field  { color: var(--accent); }
+.tl-created .tl-change { color: var(--text3); }
+.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; }
+.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 +172,31 @@
   </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">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

@@ -39,7 +39,6 @@ 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();
@@ -100,8 +99,21 @@ async function filterInstances() {
 
 // ── Detail Page ───────────────────────────────────────────────────────────────
 
+const BOOL_FIELDS = ['atlas','argus','semaphore','patchmon','tailscale','andromeda','hardware_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] = await Promise.all([getInstance(vmid), getInstanceHistory(vmid)]);
   if (!inst) { navigate('dashboard'); return; }
   currentVmid = vmid;
 
@@ -134,10 +146,26 @@ async function renderDetailPage(vmid) {
     </div>
   `).join('');
 
-  document.getElementById('detail-timestamps').innerHTML = `
+  document.getElementById('detail-timestamps').innerHTML = history.length
-    <div class="kv-row"><span class="kv-key">created</span><span class="kv-val">${fmtDateFull(inst.created_at)}</span></div>
+    ? history.map(e => {
-    <div class="kv-row"><span class="kv-key">updated</span><span class="kv-val">${fmtDateFull(inst.updated_at)}</span></div>
+        if (e.field === 'created') return `
-  `;
+          <div class="tl-item tl-created">
+            <span class="tl-time">${fmtDateFull(e.changed_at)}</span>
+            <span class="tl-field">created</span>
+            <span class="tl-change">—</span>
+          </div>`;
+        return `
+          <div class="tl-item">
+            <span class="tl-time">${fmtDateFull(e.changed_at)}</span>
+            <span class="tl-field">${esc(e.field)}</span>
+            <span class="tl-change">
+              <span class="tl-old">${fmtHistVal(e.field, e.old_value)}</span>
+              <span class="tl-arrow">→</span>
+              <span class="tl-new ${stateClass(e.field, e.new_value)}">${fmtHistVal(e.field, e.new_value)}</span>
+            </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 +286,62 @@ function showToast(msg, type = 'success') {
   toastTimer = setTimeout(() => t.classList.remove('show'), 3000);
 }
 
+// ── Settings Modal ────────────────────────────────────────────────────────────
+
+function openSettingsModal() {
+  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('instance-modal').classList.contains('open'))  { closeModal();         return; }
-  if (document.getElementById('confirm-overlay').classList.contains('open')) { closeConfirm(); 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 +350,6 @@ 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();
+});

package.json

@@ -1,6 +1,6 @@
 {
   "name": "catalyst",
-  "version": "1.2.0",
+  "version": "1.2.2",
   "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,
@@ -119,12 +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);
 }
 
+export function importInstances(rows) {
+  db.exec('BEGIN');
+  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 ──────────────────────────────────────────────────────────────
 
 export function _resetForTest() {

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();
@@ -54,6 +54,14 @@ 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);
@@ -104,6 +112,35 @@ router.put('/instances/:vmid', (req, 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' });
+  }
+});
+
 // DELETE /api/instances/:vmid
 router.delete('/instances/:vmid', (req, res) => {
   const vmid = parseInt(req.params.vmid, 10);

tests/api.test.js

@@ -239,6 +239,72 @@ 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)
+  })
+})
+
 // ── 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());
@@ -166,6 +166,62 @@ describe('deleteInstance', () => {
   });
 });
 
+// ── 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([]);
+  });
+});
+
+// ── 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 ───────────────────────────────────────────
 
 describe('test environment boot isolation', () => {