How can data relevance be ensured in Redis?

To ensure data freshness in Redis, the following methods can be used:

• Setting a Time To Live (TTL) for keys — allows automatic removal of outdated data.
• Publish/Subscribe (Pub/Sub) mechanisms — for notifying about changes and synchronizing data.
• Using Keyspace Notifications — enables reacting to key changes.
• Regularly updating data from the source — for example, periodic cache reset and overwrite.
• Using caching strategies with version or checksum verification — to update data only when changes occur.

Example of setting TTL in Java using Jedis:

Jedis jedis = new Jedis("localhost");
jedis.set("key", "value");
jedis.expire("key", 3600); // key will expire in 3600 seconds