.dbev-shm and .dev-wal

For Database Events files I’m noticing two additional filetypes for each database created with extensions “.dbev-shm” and “.dev-wal”. I presumed these were temporary files, but after both closing the database and quitting Database Events the files persist.

Can anyone shed some light on these file types? I have done a fair bit of research online and searched the forums to no avail.

Model: Hackintosh, 3.39 GHz Xeon, 16 GB, Sierra v 10.12.5
AppleScript: 2.5
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Operating System: Mac OS X (10.13 Developer Beta 3)

Database Events uses SQLite, and these are SQLite files. See here for more info: http://www.sqlite.org/wal.html

Thanks Shane. This answers my question satisfactorily. Probably worth digging into at some point to understand the file type usage further. For now, at least I understand the general usage.