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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
On my RetroArch on PC based on Linux the thumbnails are in a subfolder named "thumbnails" in main RetroArch folder. Each system has folders as "Named_Boxarts", "Named_Snaps" and "Named_Titles". Manually downloads could be done in example at https://thumbnails.libretro.com/ or one of the repos in https://github.com/libretro-thumbnails?q=mame&type=all&language=&sort= or in one of the the subfolders in https://github.com/libretro-thumbnails/libretro-thumbnails
NOTE:
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Hence, a higher number means a more popular project.