Follow latest child session on dashboard resume

hermes_cli/web_server.py

@@ -2173,6 +2173,83 @@ async def cancel_oauth_session(session_id: str, request: Request):
 # ---------------------------------------------------------------------------
 
 
+
+def _session_latest_descendant(session_id: str):
+    """Resolve a session id to the newest child leaf session.
+
+    /model may create child sessions. Dashboard refresh should continue the
+    newest child instead of reopening the old parent.
+    """
+    from hermes_state import SessionDB
+
+    def row_get(row, key, index):
+        if isinstance(row, dict):
+            return row.get(key)
+        try:
+            return row[key]
+        except Exception:
+            try:
+                return row[index]
+            except Exception:
+                return None
+
+    db = SessionDB()
+    try:
+        sid = db.resolve_session_id(session_id)
+        if not sid or not db.get_session(sid):
+            return None, []
+
+        conn = (
+            getattr(db, "conn", None)
+            or getattr(db, "_conn", None)
+            or getattr(db, "connection", None)
+            or getattr(db, "_connection", None)
+        )
+
+        rows = []
+        if conn is not None:
+            raw_rows = conn.execute(
+                "SELECT id, parent_session_id, started_at FROM sessions"
+            ).fetchall()
+            for row in raw_rows:
+                rows.append({
+                    "id": row_get(row, "id", 0),
+                    "parent_session_id": row_get(row, "parent_session_id", 1),
+                    "started_at": row_get(row, "started_at", 2),
+                })
+        else:
+            rows = db.list_sessions_rich(limit=10000, offset=0)
+
+        children = {}
+        for row in rows:
+            rid = row.get("id")
+            parent = row.get("parent_session_id")
+            if rid and parent:
+                children.setdefault(parent, []).append(row)
+
+        def started(row):
+            try:
+                return float(row.get("started_at") or 0)
+            except Exception:
+                return 0.0
+
+        current = sid
+        path = [sid]
+        seen = {sid}
+
+        while children.get(current):
+            candidates = [r for r in children[current] if r.get("id") not in seen]
+            if not candidates:
+                break
+            candidates.sort(key=started, reverse=True)
+            current = candidates[0]["id"]
+            path.append(current)
+            seen.add(current)
+
+        return current, path
+    finally:
+        db.close()
+
 @app.get("/api/sessions/{session_id}")
 async def get_session_detail(session_id: str):
     from hermes_state import SessionDB
@@ -2187,6 +2264,19 @@ async def get_session_detail(session_id: str):
         db.close()
 
 
+
+@app.get("/api/sessions/{session_id}/latest-descendant")
+async def get_session_latest_descendant(session_id: str):
+    latest, path = _session_latest_descendant(session_id)
+    if not latest:
+        raise HTTPException(status_code=404, detail="Session not found")
+    return {
+        "requested_session_id": path[0] if path else session_id,
+        "session_id": latest,
+        "path": path,
+        "changed": bool(path and latest != path[0]),
+    }
+
 @app.get("/api/sessions/{session_id}/messages")
 async def get_session_messages(session_id: str):
     from hermes_state import SessionDB
@@ -2958,6 +3048,9 @@ def _resolve_chat_argv(
     env.setdefault("HERMES_TUI_DISABLE_MOUSE", "1")
 
     if resume:
+        latest_resume, _latest_path = _session_latest_descendant(resume)
+        if latest_resume:
+            resume = latest_resume
         env["HERMES_TUI_RESUME"] = resume
 
     if sidecar_url: