Files Historic Plugin Retention Improvements

[ata-nas]

Story Form

As a Block Node User/Developer
I want to have a well written and resilient retention logic
So that I am confident with my retention implementation

Technical Notes

• as mentioned in this comment thread we can improve the retention logic:
  • keep track of zips present (count)
  • modify excess calculation
  • walk the FS and delete from lowest zip found (much more resilient and less error prone)