Setting an expiring column
When you set a column in Cassandra, you can optionally set an expiration time, or time-to-live (TTL) attribute for the data. The data is not actually deleted from disk until normal Cassandra compaction processes are completed.
Define a coupon_code column and set an expiration date on that column.
[default@demo] SET users['bobbyjo'] [utf8('coupon_code')] = utf8('SAVE20') WITH ttl=864000;
After ten days, or 864,000 seconds have elapsed since the setting of this column, its value will be marked as deleted and no longer be returned by read operations.