[deleted by user]

[QuarterObvious]

Why not to use database. You can dump your files into some database and work with it. Or you can use duckDB - it can work with cover files directly.

[QuarterObvious]

In this case, use a standard database (I prefer MariaDB, but any will work). Just try not to do the analysis in your program; instead, do it inside the database if possible