What is the time travel feature?
💡 Model Answer
Time travel is a feature in modern data warehouses that allows users to query historical versions of data at a specific point in time or within a defined retention window. It works by retaining a copy of data changes (either as full snapshots or incremental logs) for a configurable period. This enables point‑in‑time queries, rollback of accidental deletes or updates, auditing, and reproducible analytics. For example, in Snowflake, you can run "SELECT * FROM orders AT (TIMESTAMP => '2023‑12‑01 10:00:00')" to see the table as it existed at that moment. Time travel is implemented using immutable storage and metadata tracking, ensuring that queries can access past states without affecting current data.
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