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I'm stunned that you're stunned that people generally don't use text files as data stores.

How do you deal with concurrent write access, do you lock the file?

He probably uses flock(2)

But isn't that hard to get right? At least if you using something like sqlite you get consistency guarantees.

Consider your process writing to the file and dying during write() - do you recover and repair the file after you reschedule?

Ramdisk maybe?