The Spanner change streams default retention period has been increased from 1 day to 7 days

## Announcement Announcement The Spanner change streams default [retention period](https://cloud.google.com/spanner/docs/change-streams#data-retention) has been increased from 1 day to 7 days. This change affects both new and existing change streams that don't have a retention period explicitly set. You can always specify the retention period through [create change stream](https://cloud.google.com/spanner/docs/change-streams/manage#create) or [alter change stream](https://cloud.google.com/spanner/docs/change-streams/manage#modify) DDL statements to override the default. ## Feature Feature You can populate new PostgreSQL dialect databases in an existing Spanner instance from sample datasets that help you explore Spanner capabilities. For more information, see [Create and manage databases](https://cloud.google.com/spanner/docs/create-manage-databases#use-datasets).