Fix print page vendor load + persist authored scene across deploys

server/sync-server.js

@@ -13,9 +13,17 @@ const PORT = process.env.PORT || 34034;
 const TICK_HZ = Number(process.env.TICK_HZ || 20); // server broadcast rate
 
 // ---- Load scene ----------------------------------------------------------
+// Two files:
+//   data/scene.json       -> committed "seed" (tracked in git). Default/first-run.
+//   data/scene.live.json  -> authored scene written by the admin (git-IGNORED),
+//                            so `git reset --hard` on deploy never clobbers it.
+// We read live if it exists, else fall back to the seed. Saves always go to live.
+const SEED_PATH = join(ROOT, 'data', 'scene.json');
+const LIVE_PATH = join(ROOT, 'data', 'scene.live.json');
+
 function loadScene() {
-  const raw = readFileSync(join(ROOT, 'data', 'scene.json'), 'utf-8');
-  return JSON.parse(raw);
+  const path = existsSync(LIVE_PATH) ? LIVE_PATH : SEED_PATH;
+  return JSON.parse(readFileSync(path, 'utf-8'));
 }
 let scene = loadScene();
 
@@ -129,7 +137,7 @@ app.post('/api/scene', (req, res) => {
   if (err) return res.status(400).json({ ok: false, error: err });
   try {
     const dataDir = join(ROOT, 'data');
-    const target = join(dataDir, 'scene.json');
+    const target = LIVE_PATH; // authored scene -> live file (survives deploys)
     // timestamped backup so a bad save is always recoverable
     const backupDir = join(dataDir, 'backups');
     if (!existsSync(backupDir)) mkdirSync(backupDir, { recursive: true });
@@ -205,5 +213,6 @@ setInterval(() => {
 httpServer.listen(PORT, () => {
   console.log(`Newbury exhibit sync server on :${PORT} (broadcast ${TICK_HZ}Hz)`);
   console.log(`  Viewer:  http://localhost:${PORT}/`);
-  console.log(`  Scene:   ${scene.spawns.length} spawns, ${scene.anchors.length} anchors`);
+  console.log(`  Scene:   ${scene.spawns.length} spawns, ${scene.anchors.length} anchors` +
+    ` (${existsSync(LIVE_PATH) ? 'live: scene.live.json' : 'seed: scene.json'})`);
 });