While the check and clean already works impressive there are possible improvements.
gamelists/retropie/gamelist.xml
Oct 06 15:25:36 lvl2: Parsing XML file "/home/pi/.emulationstation/gamelists/retropie/gamelist.xml"...
Oct 06 15:25:36 lvl1: File "/home/pi/RetroPie/retropiemenu/+Start PICO8.sh" does not exist! Ignoring.
collections/custom-PC ENGINE.cfg
Oct 06 15:25:37 lvl2: Loading custom collection config file at /home/pi/.emulationstation/collections/custom-PC ENGINE.cfg
Oct 06 15:25:37 lvl2: Couldn't find game referenced at '/home/pi/RetroPie/roms/pcengine/Street Fighter II' - Champion Edition (Japan).zip' for system config '/home/pi/.emulationstation/collections/custom-PC ENGINE.cfg'
collections/custom-strategy.cfg
Oct 06 15:25:38 lvl2: Loading custom collection config file at /home/pi/.emulationstation/collections/custom-strategy.cfg
Oct 06 15:25:38 lvl2: Couldn't find game referenced at '/home/pi/RetroPie/roms/amigacd32/e Fodder (Europe).cue' for system config '/home/pi/.emulationstation/collections/custom-strategy.cfg'
Oct 06 15:25:38 lvl2: Loading custom collection config file at /home/pi/.emulationstation/collections/custom-trackball.cfg
missing items like referenced pictures in the themes xml files (see emulationstation log file: ~/.emulationstation/es_log.txt)
While the check and clean already works impressive there are possible improvements.