ivl.android.moneybalance: Warn about data loss on application downgrade

I made an unfortunate design decision in my app "MoneyBalance". At startup, if the database format is newer than the app understands, it will drop all data and start with a pristine database. In the recently released version 1.3 I changed the database format. The database will be automatically updated when starting the new version. But in case the user downgrades to a previous version they will lose all data.

I'm planning to address this issue shortly, but there's nothing I can do to fix the previous releases. Or can I replace the previously release version to patch out the database wipes?