Add explain analysis workflow and UI

backend/core/state_sync.py

@@ -47,6 +47,10 @@ class StateSync:
         """Set current simulation date for backtest-compatible timestamps"""
         self._simulation_date = date
 
+    def clear_simulation_date(self):
+        """Disable backtest timestamp simulation and use wall-clock time."""
+        self._simulation_date = None
+
     def _get_timestamp_ms(self) -> int:
         """
         Get timestamp in milliseconds.
@@ -97,9 +101,21 @@ class StateSync:
         if not self._enabled:
             return
 
-        # Ensure timestamp exists (use simulation date if in backtest mode)
+        # Ensure timestamp exists. Prefer explicit millisecond timestamps so
+        # frontend displays local wall time correctly instead of date-only UTC.
         if "timestamp" not in event:
-            if self._simulation_date:
+            ts_ms = event.get("ts")
+            if ts_ms is not None:
+                try:
+                    event["timestamp"] = datetime.fromtimestamp(
+                        float(ts_ms) / 1000.0,
+                    ).isoformat()
+                except (TypeError, ValueError, OSError):
+                    if self._simulation_date:
+                        event["timestamp"] = f"{self._simulation_date}"
+                    else:
+                        event["timestamp"] = datetime.now().isoformat()
+            elif self._simulation_date:
                 event["timestamp"] = f"{self._simulation_date}"
             else:
                 event["timestamp"] = datetime.now().isoformat()
@@ -238,9 +254,12 @@ class StateSync:
         """Called at start of trading cycle"""
         self._state["current_date"] = date
         self._state["status"] = "running"
-        self.set_simulation_date(
-            date,
-        )  # Set for backtest-compatible timestamps
+        if self._state.get("server_mode") == "backtest":
+            self.set_simulation_date(
+                date,
+            )  # Set for backtest-compatible timestamps
+        else:
+            self.clear_simulation_date()
 
         await self.emit(
             {