Hi,

For V4 spec, I have a small proposal [1] to expose the row timestamp
concept that can help with many use cases like temporal queries, latency
tracking, TTL, auditing and compliance.

This *_last_updated_timestamp_ms * metadata column behaves very similarly
to the *_last_updated_sequence_number* for row lineage.

   - Initially, it inherits from the snapshot timestamp.
   - During rewrite (like compaction), its values are persisted in the data
   files.

Would love to hear what you think.

Thanks,
Steven

[1]
https://docs.google.com/document/d/1cXr_RwEO6o66S8vR7k3NM8-bJ9tH2rkh4vSdMXNC8J8/edit?usp=sharing

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