How to properly create a table for user messages?

I have a table with user channels in the Apache Cassandra database. And queries responsible for getting the list of channels and getting data about the channel. One of the queries requires ALLOW FILTERING, we think that the best option is to make a duplicate of the table, only it will have a primary key ((channel_id, bucket), user_id), and then the question arose, is there something like links in Apache Cassandra, so that the database does not have to constantly write and update data in both tables. If you know a solution where this does not need to be done, then I will be very grateful for the solution

create table channels
(
    user_id     bigint,
    bucket      int,
    channel_id  bigint,
    flags       int,
    permissions bigint,
    type        int,
    primary key ((user_id, bucket), channel_id)
)

SELECT * FROM channels WHERE user_id = :user_id AND bucket = :bucket

SELECT * FROM channels WHERE channel_id = :channel_id ALLOW FILTERING