Prepared for playback engine

src/dynalab_core/buffer.py

@@ -42,6 +42,10 @@ class ValueBuffer:
                 for timestamp, signal_id, value in self._samples
             ]
 
+    def sort(self) -> None:
+        with self._lock:
+            self._samples.sort(key=lambda sample: sample[0])
+
     def export_csv(self) -> str:
         with self._lock:
             samples = list(self._samples)