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Delta Lake Time Travel and Versioning Walkthrough

Added Jun 2025 3 design docs

Data teams are routinely asked questions that ordinary tables cannot answer: what did this dataset look like before yesterday's load, who changed these rows, and can we roll back a bad write? Delta Lake answers all of them by versioning every transaction, and understanding this capability changes how engineers think about data safety and reproducibility.

The intern builds an interactive notebook on Databricks that demonstrates time travel end to end. Working with a sample dataset in a Delta table, the intern performs a sequence of inserts, updates, and deletes with Spark and Python, then uses DESCRIBE HISTORY to inspect the transaction log and query earlier states of the table by version number and by timestamp. The walkthrough lets users compare versions side by side to see exactly which rows changed between loads, demonstrates restoring the table to a previous version to recover from a simulated bad write, and explains how the transaction log makes all of this possible on ordinary storage.

The project gives the intern a working understanding of the ACID transaction layer that distinguishes a lakehouse from a folder of files, practical experience with versioned data operations, and a well-documented educational artifact that shows they can both master and teach a foundational big data concept.

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