Function dm_lock_remove

Scripts/ButSystem.py:14729–14734

(username: str)

@app.route("/api/group/<int:gid>/since")
@login_required
def api_group_since(gid: int):
    """Return new group messages since a given id (AJAX polling).

    This endpoint lets group chats update in-place (no full page refresh)
    when messages are sent/received.

    Query params:
        id: Last seen group message id (integer).
        html: If '1', include pre-rendered HTML rows for easy DOM append.