This table contains the schema versions for a range of snapshots. It is necessary to compact files with different schemas.

Column name	Column type
begin_snapshot	BIGINT
schema_version	BIGINT
table_id	BIGINT

• begin_snapshot refers to a snapshot_id in the ducklake_snapshot table.
• schema_version identifies the table's column schema version.
• table_id refers to the id of the table, allowing to track the schema changes per table.