Purge timer and last seen timer frequency?
Please tell me what these points mean:
"Purge Timer Frequency": 300.0,
"Last Seen Timer Frequency": 300.0

My goal is to remove buildings after 7 days, is my configuration correct?

{
  "Purge Settings": [
    {
      "Permission": "",
      "Lifetime": "7d"
    }
  ],
  "Purge Timer Frequency": 300.0,
  "Last Seen Timer Frequency": 300.0
}​
Yes. Frequency is how often timer updates time for Last seen and how often tries to purge entities.
... it is possible that when you reach LifeTime not immediately a building is completely deleted but in small steps, for example, you can set: delete from today and completely delete step by step only 1 day later.I think the version of AutoPurge or other plugin could do that in an earlier version :)

Example:
Deletion of buildings should begin after 7 days, but only step by step on the 8th day be completed!
How should I implement this? Like, delete only the farthest parts (from the TC) of the building in first N hours, and etc? Thank you for your idea tho