CREATE TABLE messages (
    chat_id UUID, -- Partition key
    user_id UUID,
    content text,
    type text,
    created_at timestamp, -- Clustering column
    PRIMARY KEY (chat_id, content, type, created_at)
) WITH CLUSTERING ORDER BY (created_at DESC);

CREATE TABLE user_chats (
    user_id UUID, -- Partition key
    chat_id UUID, -- Clustering column
    blocked boolean,
    created_at timestamp,
    PRIMARY KEY (user_id, chat_id, blocked, created_at)
);

CREATE MATERIALIZED VIEW chat_users AS
    SELECT chat_id, user_id, blocked, created_at
    FROM user_chats
    WHERE chat_id IS NOT NULL AND user_id IS NOT NULL AND created_at IS NOT NULL
    PRIMARY KEY (chat_id, user_id, blocked, created_at);

BEGIN BATCH
    INSERT INTO messages (chat_id, user_id, content, type, created_at)
    VALUES ('b9b29446-d50a-42d0-b3e2-bfaabd85fa4b', '8c796bf4-c9cd-4851-8379-6f67f69e1b99', 'Message 1', 'text', toTimestamp(now()))
    IF EXISTS
    AND (SELECT blocked FROM user_chats WHERE user_id = '8c796bf4-c9cd-4851-8379-6f67f69e1b99' AND
    chat_id = 'b9b29446-d50a-42d0-b3e2-bfaabd85fa4b') = false;
APPLY BATCH;

INSERT INTO user_chats (user_id, chat_id, blocked, created_at) VALUES (uuid(), uuid(), false, toTimestamp(now()));

INSERT INTO messages (chat_id, user_id, content, type, created_at, year_month, seen)
VALUES (uuid(), uuid(), 'Your message content', 'text', toTimestamp(now()), '2020-01');

SELECT * FROM messages LIMIT 1;