We need a simple migration tool (import/export all data) in order to save all the data and populate the new database (after migration).
Migration from 2.1.0 to 2.1.3 solve some bugs (as add item), but it needs to drop the database and create a new one, resulting on a total fresh install. The items data can be exported and reimported, but all the transactions are lost.
This tool can also provide version compatibility, in case that new features and tables are added to the app.
The step-by-step procedure could be:
(No data lost!)