Setting TTL

INSERT INTO sessions (id, data) VALUES (?, ?) USING TTL 86400;
-- 1 day TTL
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Expiration mechanism

Cell becomes tombstone at expiry. Persists until compacted + gc_grace_seconds. Tombstone read-cost applies during that window.

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TWCS + TTL

Time-Window Compaction Strategy: whole SSTables expire together. Efficient. Match window to TTL.