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Maybe I'm shooting for the moon, but I'd like soft delete to be some kind of built-in database feature. It would be nice to enable it on a table then choose some built-in strategies on how it's handled.

Soft-delete is a common enough ask that it's probably worth putting the best CS/database minds to developing some OOTB feature.

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Many data warehousing paradigms (e.g. Iceberg, Delta Lake, BigQuery) offer built-in "time travel," sometimes combined with scheduled table backups. That said, a lot of the teams I've worked with who want soft-delete also have other requirements that necessitate taking a custom approach (usually plain ol' SCD) instead of using the platform-native implementation.

> other requirements

In my experience, usually along the lines of "what was the state of the world?" (valid-time as-of query) instead of "what was the state of the database?" (system-time as-of query).

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