Update jam_worker.py

jam_worker.py

@@ -156,6 +156,12 @@ class JamWorker(threading.Thread):
         self._stop_event = threading.Event()
         self._max_buffer_ahead = 1
 
+        # activity tracking for session monitoring
+        self.created_at = time.time()
+        self.last_chunk_started_at: Optional[float] = None
+        self.last_chunk_completed_at: Optional[float] = None
+        self.last_activity_at = time.time()
+
         # reseed queues (install at next bar boundary after emission)
         self._pending_reseed: Optional[dict] = None           # legacy full reset path (kept for fallback)
         self._pending_token_splice: Optional[dict] = None     # seamless token splice
@@ -738,7 +744,15 @@ class JamWorker(threading.Thread):
                         self._style_vec += step * (target.astype(np.float32, copy=False) - self._style_vec)
                     style_to_use = self._style_vec
 
+            # Track chunk generation timing
+            self.last_chunk_started_at = time.time()
+            self.last_activity_at = time.time()
+
             wav, self.state = self.mrt.generate_chunk(state=self.state, style=style_to_use)
+
+            self.last_chunk_completed_at = time.time()
+            self.last_activity_at = time.time()
+
             # append and spool
             self._append_model_chunk_and_spool(wav)
             # try emitting zero or more chunks if available