replay capture ?

server/src/services/replayService.js

@@ -0,0 +1,42 @@
+const EventEmitter = require('events');
+
+const COOLDOWN_MS = 10 * 1000;
+
+const events = new EventEmitter();
+let lastTriggeredAt = null;
+let lastTriggeredBy = null;
+
+function getRemainingMs(now = Date.now()) {
+  if (!lastTriggeredAt) return 0;
+  const elapsed = now - lastTriggeredAt;
+  return Math.max(0, COOLDOWN_MS - elapsed);
+}
+
+function getState() {
+  const remainingMs = getRemainingMs();
+  return {
+    cooldownMs: COOLDOWN_MS,
+    lastTriggeredAt,
+    lastTriggeredBy,
+    remainingMs,
+    available: remainingMs === 0,
+  };
+}
+
+function tryTrigger(by = null) {
+  const remainingMs = getRemainingMs();
+  if (remainingMs > 0) {
+    return { ok: false, remainingMs, state: getState() };
+  }
+  lastTriggeredAt = Date.now();
+  lastTriggeredBy = by || null;
+  const state = getState();
+  events.emit('update', { state, by: lastTriggeredBy });
+  return { ok: true, state };
+}
+
+module.exports = {
+  tryTriggerReplay: tryTrigger,
+  getReplayState: getState,
+  replayEvents: events,
+};