what does arg 'ts' do in put/delete apis

[zd08135]

this is the question.
Is it useful when we need a key to "auto expire"?

[ltamasi]

No, those parameters are related to the user-defined timestamps feature (https://github.com/facebook/rocksdb/wiki/User-defined-Timestamp). For keys that expire, you may want to look at https://github.com/facebook/rocksdb/wiki/Time-to-Live .