Irreversibly admit administrator purge or clear-history for bounded cleanup

curl -X POST "https://example.com/v1/files/deletion-operations" \
  -H "Content-Type: application/json" \
  -d '{
    "workplaceId": "4989ce91-52f9-461b-87fa-af1f28004fc0",
    "operationId": "3051932a-fdd2-48fa-b330-7e7d41535969",
    "fileId": "a1c6a2ab-4b01-4253-b4c9-70e04b3b48fc",
    "expectedVersion": "d4872add-ad6c-489f-92b8-0d0c927185fe",
    "action": "purge"
  }'

{
  "operationId": "3051932a-fdd2-48fa-b330-7e7d41535969",
  "fileId": "a1c6a2ab-4b01-4253-b4c9-70e04b3b48fc",
  "action": "purge",
  "version": "8b898373-21c7-4028-b85f-cc5068e68df9",
  "admittedAt": "2019-08-24T14:15:22Z",
  "targetCount": 0,
  "processedCount": 0,
  "state": "pending",
  "phase": "collecting"
}