Previously, AltStore would quit all other processes when first accessing the database no matter what. However, this unintentionally caused the widget extension to quit the main app after refreshing apps.
Now, we only quit other AltStore processes if a database migration is required. This still prevents multiple AltStores with different database schemas from accessing database concurrently, but also allows extensions to access database without quitting main app.
AltStore now sends a “WillAccessDatabase” notification before loading the persistent store, which causes other AltStore instances in memory to exit (either immediately, or upon returning to foreground).
This prevents multiple AltStore instances from simultaneously accessing the same database, which could result in corrupted data (especially if they used different database model versions).
