This comment is confusing here. The reader doesn't know why would we want to rekey here.
Could you either:

• add a note to see validateEncryption() counterpart on native

Done

• or completely remove this web override and add a default empty implementation in parent SQLiteConnectionManager::validateEncryption()

My initial approach was that each platform-specific method should be pure virtual in SQLiteConnectionManager, to make SQLiteConnectionManager abstract and to consider this platform-specific behaviour on each of the derived classes, even if it is doing nothing, I thought it was better to do it explicitly inthe derived class with a meaningful comment