Sample on how to use Change Tracking in Azure SQL Database. Change tracking is a lightway method to get only the rows that have been inserted, updated or deleted since the last time you visited the database.
In the App folder you also have a working sample on how to sync Azure SQL Database into a local SQLite, using the DotMim.Sync project, that you can find here: https://github.com/Mimetis/Dotmim.Sync
If you want an full end-to-end demo of how you can use Change Tracking to build smart and efficient solution, take a look a this repo: https://github.com/azure-samples/azure-sql-db-sync-api-change-tracking/