Is your feature request related to a problem? Please describe.

Files are stored in MISP/app/files/[event_id]/[attribute_id] .
If you have a lot of events with files in them, this means you get a very large amount of subdirectories in MISP/app/files/[event_id], leading to issues with tools (CLI commands, backup tools etc...)

Would it be possible to split this structure, for example using substring of the id to create more manageable paths?

Describe the solution you'd like

Bucket the subdirectories somehow (based on first x characters?)

Describe alternatives you've considered

No response

Additional context

No response

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