Arvados

lib/config/config.default.yml documents DefaultTrashLifetime like this:

      # Default lifetime for ephemeral collections: 2 weeks. This must not
      # be less than BlobSigningTTL.
      DefaultTrashLifetime: 336h

This is the only place in the code or documentation that talks about "ephemeral collections," so it's not at all clear what that is. This verbiage could use some work. Maybe something like:

This is the default timespan that trashed collections are kept in the trash and recoverable. After this time, the collection is permanently deleted, and the underlying data may be deleted from Keep if no other collections refer to it. Default two weeks.