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https://www.sqlite.org/fasterthanfs.html

> SQLite reads and writes small blobs (for example, thumbnail images)
> approx. 35% faster than the same blobs can be read from or written
> to individual files on disk using fread() or fwrite().
> Furthermore, a single SQLite database holding
> 10-kilobyte blobs uses about 20% less disk space than
> storing the blobs in individual files.
> The measurements in this article were made during the week of 2017-06-05
> using a version of SQLite in between 3.19.2 and 3.20.0.  You may expect
> future versions of SQLite to perform even better.