Force reindex of media files

I'm having a terrible time trying to force Airtime to reindex/reimport a bunch of files.

I have some 2500 files in my /home/drop directory. That is watched in Airtime.

Only 387 of them are showing up in Airtime's file list! Where are the rest of them?

I tried the trick of removing and re-adding the watch dir in the Airtime interface, and also doing the same from airtime-import. It doesn't help.

So I tried using airtime-import -m to move them from /home/drop. That appeared to work-- alll the files got physically moved from /home/drop into /srv/airtime/stor/imported and /srv/airtime/stor/organize ,etc, but they still never appeared in the database! So I moved them back to /home/drop . I tried restarting the airtime-media-monitor, several times.

I've been thrashing at this for some time, and getting very annoyed and frustrated. Where is, and what would be, the command to force the whole directory to be reimported, and, most importantly, reindexed so it shows up in the playlist builder? There are thousands of files, and they're all valid ogg or mp3 files, and yet, Airtime doesn't even appear to be trying to add them.