Hello @VenkateswarluAd ,
Greetings of the day!

The columns __START_AT and __END_AT are used to track the validity period of each record for SCD Type 2 updates. Please be aware that renaming these columns could disrupt the functionality of the SCD Type 2 updates.

You can read more about this here: https://docs.databricks.com/en/delta-live-tables/cdc.html#how-is-cdc-implemented-with-the-apply-chan...

Regards,

Ravi