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up to a limited number of snapshots. it's not arbitrary times, it's when there was an atomic snapshot created in the catalog.

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Don't know about other systems, but in Ducklake every committed transaction creates a new snapshot.

https://ducklake.select/docs/stable/duckdb/usage/snapshots

because they are making an extra step: instead of the snapshot being actually an object manifest, they store the snapshot metadata in a relation database.

I have a use case where we do 100k changes a second. I bet you "their unlimited snapshots because we are cool and using dbs for metadata" will fail in such a use case.

Every commit in Delta is time travel-able. Defaults in Delta clean up logs in 30 days (and data in 7 days but requires a VACUUM be issued.) You can set those retention periods to any arbitrary time period, but it's typically advised against due to the cost to store all the historical data.

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