fix: invalidate tokens on permission change (medium), optimize create_user query, fix ws reconnect race

- update_permissions now calls blacklist_active_refresh_token and
  rotate_user_secret to immediately invalidate stale tokens
- create_user uses returned id from tx.run_one instead of redundant SELECT
- websocket reconnect explicitly closes old connection after token refresh
  to prevent onclose handler race condition

lib/auth_users.py

@@ -160,13 +160,13 @@ def create_user(
 
     db = get_db()
     with db.in_transaction() as tx:
-        tx.run_one(Q_INSERT_USER, (username, password_hash, jwt_secret))
+        user_id = tx.run_one(Q_INSERT_USER, (username, password_hash, jwt_secret))
         if permissions:
             for subsystem, level in permissions.items():
                 tx.run(Q_UPSERT_PERMISSION, (username, subsystem, level))
 
     return {
-        "id": db.query(Q_SELECT_USER_BY_NAME, (username,))[0]["id"],
+        "id": user_id,
         "username": username,
         "permissions": _get_permissions(username),
     }
@@ -202,9 +202,11 @@ def update_password(username: str, old_password: str, new_password: str) -> bool
 
 
 def update_permissions(username: str, permissions: dict[str, str]) -> None:
-    """Update a user's permissions.
+    """Update a user's permissions and invalidate all existing tokens.
 
-    Replaces all existing permissions with the provided mapping.
+    Replaces all existing permissions with the provided mapping. Rotates the
+    JWT secret so that permission changes take effect immediately — existing
+    tokens with stale permissions are no longer valid.
 
     Args:
         username: The username.
@@ -219,6 +221,8 @@ def update_permissions(username: str, permissions: dict[str, str]) -> None:
         tx.run(Q_DELETE_PERMISSIONS, (username,))
         for subsystem, level in permissions.items():
             tx.run(Q_UPSERT_PERMISSION, (username, subsystem, level))
+    blacklist_active_refresh_token(username)
+    rotate_user_secret(username)
 
 
 def list_users() -> list[dict[str, Any]]:

webui/static/hoover/websocket.js

@@ -59,12 +59,14 @@ function _wsConnect() {
 
         if (_wsFailCount >= 3 && !_wsRefreshing) {
             _wsRefreshing = true;
+            const oldConn = _wsConn;
             tryRefreshToken().then(ok => {
                 _wsRefreshing = false;
                 if (ok) {
                     _wsFailCount = 0;
                     _wsReconnectMs = 0;
                     _wsConn = null;
+                    if (oldConn) oldConn.close();
                     setTimeout(_wsConnect, 100);
                 } else {
                     redirectLogin();