fix: exclude archived keys in heartbeat & fallback missing session timestamps

nanobot/cli/commands.py

@@ -1065,8 +1065,15 @@ def _run_gateway(
     def _pick_heartbeat_target() -> tuple[str, str]:
         """Pick a routable channel/chat target for heartbeat-triggered messages."""
         enabled = set(channels.enabled_channels)
+
+        from nanobot.webui.sidebar_state import read_webui_sidebar_state
+        sidebar_state = read_webui_sidebar_state()
+        archived_keys = set(sidebar_state.get("archived_keys", []))
+
         for item in session_manager.list_sessions():
             key = item.get("key") or ""
+            if key in archived_keys:
+                continue
             if ":" not in key:
                 continue
             channel, chat_id = key.split(":", 1)

nanobot/session/manager.py

@@ -843,11 +843,13 @@ class SessionManager:
                                 if not fallback_preview and item.get("role") == "assistant":
                                     fallback_preview = text
                             preview = preview or fallback_preview
+                            from datetime import datetime
+                            fallback_time = datetime.fromtimestamp(path.stat().st_mtime).isoformat()
                             sessions.append(
                                 {
                                     "key": key,
-                                    "created_at": data.get("created_at"),
-                                    "updated_at": data.get("updated_at"),
+                                    "created_at": data.get("created_at") or fallback_time,
+                                    "updated_at": data.get("updated_at") or fallback_time,
                                     "title": title,
                                     "preview": preview,
                                     "path": str(path),

nanobot/webui/session_list_index.py

@@ -269,13 +269,20 @@ def _scan_session_row(session_manager: SessionManager, path: Path) -> dict[str,
                 if not fallback_preview and item.get("role") == "assistant":
                     fallback_preview = text
             signature = _file_signature(path)
+            created_at_s = data.get("created_at")
+            updated_at_s = data.get("updated_at")
+            if not created_at_s or not updated_at_s:
+                from datetime import datetime
+                fallback_time = datetime.fromtimestamp(signature["mtime_ns"] / 1e9).isoformat()
+                created_at_s = created_at_s or fallback_time
+                updated_at_s = updated_at_s or fallback_time
             key = data.get("key") or fallback_key
             activity_signature = _webui_activity_signature(key)
             activity_updated_at = _webui_activity_updated_at(activity_signature)
             return {
                 "key": key,
-                "created_at": data.get("created_at"),
-                "updated_at": _latest_updated_at(data.get("updated_at"), activity_updated_at),
+                "created_at": created_at_s,
+                "updated_at": _latest_updated_at(updated_at_s, activity_updated_at),
                 "title": _metadata_title(data.get("metadata", {})),
                 "preview": preview or fallback_preview,
                 "file": path.name,