Oldest supported version — apps older than this stop working and show an "update" screen with a link to the store. Raise it only when the new version is already available in that store (otherwise Apple's reviewer gets blocked too). · Latest version — apps between the two keep working but suggest updating; users can tap "Later".

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SQL = plain SQL (gzip) for viewing/import · pg_restore = for restoring the database · files = lesson PDFs and images (daily only). Backups contain students' data and passwords — do not share them.