I could find no Piwigo interface to easily extract the on-disk filenames for
a given set of photos, so I ended up playing with the underlying database
-directly. The Piwigo source tree contains a fle piwigo_structure-mysql.sql
+directly. The Piwigo source tree contains a file piwigo_structure-mysql.sql
used in the installation process to set up the database tables that served as
a handy reference for figuring out the database schema. Looking at the
piwigo_categories table, I learned that the "folder" I had uploaded all of