feat: jobs system with dedicated nav page and run history

Replaces ad-hoc Tailscale config tracking with a proper jobs system.
Jobs get their own nav page (master/detail layout), a dedicated DB
table, and full run history persisted forever. Tailscale connection
settings move from the Settings modal into the Jobs page. Registry
pattern makes adding future jobs straightforward.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/jobs.js

@@ -1,63 +1,74 @@
-import { getInstances, updateInstance, getConfig, setConfig } from './db.js';
+import { getJobs, getJob, getInstances, updateInstance, createJobRun, completeJobRun } from './db.js';
+
+// ── Handlers ──────────────────────────────────────────────────────────────────
 
 const TAILSCALE_API = 'https://api.tailscale.com/api/v2';
 
-let _interval = null;
-
-export async function runTailscaleSync() {
-  const apiKey  = getConfig('tailscale_api_key');
-  const tailnet = getConfig('tailscale_tailnet');
-  if (!apiKey || !tailnet) throw new Error('Tailscale not configured');
+async function tailscaleSyncHandler(cfg) {
+  const { api_key, tailnet } = cfg;
+  if (!api_key || !tailnet) throw new Error('Tailscale not configured — set API key and tailnet');
 
   const res = await fetch(
     `${TAILSCALE_API}/tailnet/${encodeURIComponent(tailnet)}/devices`,
-    { headers: { Authorization: `Bearer ${apiKey}` } }
+    { headers: { Authorization: `Bearer ${api_key}` } }
   );
   if (!res.ok) throw new Error(`Tailscale API ${res.status}`);
 
   const { devices } = await res.json();
-
-  // hostname -> first 100.x.x.x address
   const tsMap = new Map(
     devices.map(d => [d.hostname, (d.addresses ?? []).find(a => a.startsWith('100.')) ?? ''])
   );
 
   const instances = getInstances();
   let updated = 0;
-
   for (const inst of instances) {
-    const tsIp   = tsMap.get(inst.name);   // undefined = not in Tailscale
+    const tsIp   = tsMap.get(inst.name);
     const matched = tsIp !== undefined;
-
     const newTailscale = matched ? 1 : (inst.tailscale === 1 ? 0 : inst.tailscale);
     const newIp        = matched ? tsIp : (inst.tailscale === 1 ? '' : inst.tailscale_ip);
-
     if (newTailscale !== inst.tailscale || newIp !== inst.tailscale_ip) {
-      // Strip db-generated columns — node:sqlite rejects unknown named parameters
       const { id: _id, created_at: _ca, updated_at: _ua, ...instData } = inst;
       updateInstance(inst.vmid, { ...instData, tailscale: newTailscale, tailscale_ip: newIp });
       updated++;
     }
   }
-
-  return { updated, total: instances.length };
+  return { summary: `${updated} updated of ${instances.length}` };
 }
 
+// ── Registry ──────────────────────────────────────────────────────────────────
+
+const HANDLERS = {
+  tailscale_sync: tailscaleSyncHandler,
+};
+
+// ── Public API ────────────────────────────────────────────────────────────────
+
+export async function runJob(jobId) {
+  const job = getJob(jobId);
+  if (!job) throw new Error('Job not found');
+  const handler = HANDLERS[job.key];
+  if (!handler) throw new Error(`No handler for '${job.key}'`);
+  const cfg = JSON.parse(job.config || '{}');
+  const runId = createJobRun(jobId);
+  try {
+    const result = await handler(cfg);
+    completeJobRun(runId, 'success', result.summary ?? '');
+    return result;
+  } catch (e) {
+    completeJobRun(runId, 'error', e.message);
+    throw e;
+  }
+}
+
+const _intervals = new Map();
+
 export function restartJobs() {
-  if (_interval) { clearInterval(_interval); _interval = null; }
-  if (getConfig('tailscale_enabled') !== '1') return;
-
-  const mins = parseInt(getConfig('tailscale_poll_minutes', '15'), 10);
-  const ms   = Math.max(1, Number.isFinite(mins) ? mins : 15) * 60_000;
-
-  _interval = setInterval(async () => {
-    try {
-      const r = await runTailscaleSync();
-      setConfig('tailscale_last_run_at', new Date().toISOString());
-      setConfig('tailscale_last_result', `ok: ${r.updated} updated of ${r.total}`);
-    } catch (e) {
-      setConfig('tailscale_last_run_at', new Date().toISOString());
-      setConfig('tailscale_last_result', `error: ${e.message}`);
-    }
-  }, ms);
+  for (const iv of _intervals.values()) clearInterval(iv);
+  _intervals.clear();
+  for (const job of getJobs()) {
+    if (!job.enabled) continue;
+    const ms = Math.max(1, job.schedule || 15) * 60_000;
+    const id = job.id;
+    _intervals.set(id, setInterval(() => runJob(id).catch(() => {}), ms));
+  }
 }