ClickHouse is a performance-oriented database system that does not have UPDATE or DELETE commands due to their difficulty in storing and processing data optimally from a performance perspective. However, ClickHouse does provide mechanisms for managing partitions, which can be useful for data modification and real-time updates. The system uses a partitioning scheme based on the `EventDate` column, which splits data into monthly partitions. Partition operations such as DETACH PARTITION, DROP PARTITION, ATTACH PARTITION, FREEZE PARTITION, FETCH PARTITION, and others are available to simplify data manipulation. For real-time updates, ClickHouse employs an Incremental Log approach, where new data is added with a `Sign` field that indicates whether it's an update or deletion, allowing for efficient metrics calculation and data aggregation. The system also supports the Collapsing engine family, which can collapse deleted rows during merge processes, and has plans to introduce partitions by custom key and support for UPDATE and DELETE commands in the future.