Experience updating app, keeping user data, and extending SQLite tables?

We're updating an application in the App Store, and haven't yet found good information on how to deal with updates to the SQLite Schema and data that should be transferred between apps.
Anyone successfully done this?
Q1: Does the old DB files stay on the iPhone after update? Does the installer do a "diff" between them? In our case, we just extended tables, rather than changing them, in hope that we can successfully move the data for users gracefully.
Q2: If the installer does in fact wipe all the data and files on the app before install, is there a way to access the data before it updates, so the app can gracefully update the data?

Would you mind sharing your solution?
I've implemented it by using the PRAGMA SQL statements to query the table structure, and if it's missing the column I need for the new version, adding it.
The bigger problem, though, is some of my users have experienced their data being deleted when they received an updated version from the app store.

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Experience updating app, keeping user data, and extending SQLite tables?

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