'CoreData: annotation: PostSaveMaintenance: fileSize greater than prune

I got this message from CoreData while updating my app's database.

CoreData: annotation: PostSaveMaintenance: fileSize 9216472 greater than prune threshold
CoreData: annotation: PostSaveMaintenance: wal_checkpoint(TRUNCATE) 

What does it mean?

Does it corrupt my data (by truncation)?

How can I set a breakpoint to catch when this happens?



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